Scholars@Duke
Haiyan Gao

Haiyan Gao

Henry W. Newson Distinguished Professor of Physics
Physics
haiyan.gao@duke.edu
Box 90308, Durham, NC 27708-0308
FFSC 2313, Science Drive, Durham, NC 27708

Selected Publications

First Measurement of Near-Threshold and Subthreshold J/ψ Photoproduction off Nuclei.

Journal Article Physical review letters · May 2025 We report on the first measurement of J/ψ photoproduction from nuclei in the photon energy range of 7 to 10.8 GeV, extending above and below the photoproduction threshold in the free proton of ∼8.2  GeV. The experiment used a tagged photon beam incident on ... Full text Cite

Measurement of spin-density matrix elements in Δ++(1232) photoproduction

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · April 1, 2025 We measure the spin-density matrix elements (SDMEs) of the Δ++(1232) in the photoproduction reaction γp→π−Δ++(1232) with the GlueX experiment in Hall D at Jefferson Lab. The measurement uses a linearly–polarized photon beam ... Full text Cite

Upper Limit on the Photoproduction Cross Section of the Spin-Exotic π_{1}(1600).

Journal Article Physical review letters · December 2024 The spin-exotic hybrid meson π_{1}(1600) is predicted to have a large decay rate to the ωππ final state. Using 76.6  pb^{-1} of data collected with the GlueX detector, we measure the cross sections for the reactions γp→ωπ^{+}π^{-}p, γp→ωπ^{0}π^{0}p, and γp ... Full text Cite

The present and future of QCD

Journal Article Nuclear Physics A · July 1, 2024 This White Paper presents an overview of the current status and future perspective of QCD research, based on the community inputs and scientific conclusions from the 2022 Hot and Cold QCD Town Meeting. We present the progress made in the last decade toward ... Full text Cite

Subthreshold production of J/ψ mesons from the deuteron with the proposed Solenoidal Large Intensity Device

Journal Article Physical Review C · June 1, 2024 The electro- and photoproduction of the J/ψ meson near the threshold from the proton are relevant to the search of hidden charm pentaquark candidates reported by the LHCb collaboration, and the study of the contribution of the quantum chromodynamics (QCD) ... Full text Cite

Establishing a Research-Focused Liberal Arts College in China: Duke Kunshan University

Journal Article Daedalus · May 1, 2024 AbstractDuke Kunshan University (DKU), a new liberal arts and science university in China, with Duke University and Wuhan University as academic partners, is an experiment in twenty-first-century characteris ... Full text Cite

Experimental Status on the Proton Charge Radius

Conference Proceedings of Science · March 7, 2024 In this proceedings, we present the experimental status of measurements of the charge radius of the proton. Its accurate knowledge is not only important for understanding how Quantum Chromodynamics (QCD) is manifested in the non-perturbative QCD region, bu ... Cite

Recent Results on Proton Charge Radius and Polarizabilities

Journal Article Few Body Systems · March 1, 2024 The proton charge radius and nucleon electromagnetic polarizabilities are fundamental properties probing the electromagnetic structure of the nucleons. Proton charge radius is directly related to the proton charge distribution and the nucleon electromagnet ... Full text Cite

The solenoidal large intensity device (SoLID) for JLab 12 GeV

Journal Article Journal of Physics G Nuclear and Particle Physics · November 1, 2023 The solenoidal large intensity device (SoLID) is a new experimental apparatus planned for Hall A at the Thomas Jefferson National Accelerator Facility (JLab). SoLID will combine large angular and momentum acceptance with the capability to handle very high ... Full text Cite

Lowest-order QED radiative corrections in unpolarized elastic electron–deuteron scattering beyond the ultra-relativistic limit for the proposed deuteron charge radius measurement at Jefferson laboratory

Journal Article European Physical Journal A · November 1, 2023 Analogous to the well-known proton charge radius puzzle, a similar puzzle exists for the deuteron charge radius, rd . There are discrepancies observed in the results of rd , measured from electron-deuteron (e- d) scattering experiment ... Full text Cite

Measurement of spin-density matrix elements in ρ(770) production with a linearly polarized photon beam at Eγ=8.2-8.8 GeV

Journal Article Physical Review C · November 1, 2023 The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized 8.5GeV photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present me ... Full text Cite

Measurement of the J / ψ photoproduction cross section over the full near-threshold kinematic region

Journal Article Physical Review C · August 1, 2023 We report the total and differential cross sections for J/ψ photoproduction with the large acceptance GlueX spectrometer for photon beam energies from the threshold at 8.2 GeV up to 11.44 GeV and over the full kinematic range of momentum transfer squared, ... Full text Cite

SIDIS-RC EvGen: A Monte-Carlo event generator of semi-inclusive deep inelastic scattering with the lowest-order QED radiative corrections

Journal Article Computer Physics Communications · June 1, 2023 SIDIS-RC EvGen is a C++ standalone Monte-Carlo event generator for studies of semi-inclusive deep inelastic scattering (SIDIS) processes at medium to high lepton beam energies. In particular, the generator contains binary and library components for generat ... Full text Cite

Determining the gluonic gravitational form factors of the proton.

Journal Article Nature · March 2023 The proton is one of the main building blocks of all visible matter in the Universe1. Among its intrinsic properties are its electric charge, mass and spin2. These properties emerge from the complex dynamics of its fundamental constit ... Full text Cite

Nuclear Physics at Brookhaven National Laboratory

Journal Article Nuclear Physics News · January 1, 2023 Full text Cite

Proton spin structure and generalized polarizabilities in the strong quantum chromodynamics regime

Journal Article Nature Physics · December 1, 2022 The strong interaction is not well understood at low energies or for interactions with low momentum transfer. Chiral perturbation theory gives testable predictions for the nucleonic generalized polarizabilities, which are fundamental quantities describing ... Full text Cite

Understanding the systematic differences in extractions of the proton electric form factors at low Q2

Journal Article Physical Review C · December 1, 2022 Systematic differences exist between values of the proton's electric form factors in the low-Q2 region extracted by different experimental and theoretical groups, though they are all making use of basically the same electron-proton scattering data. To try ... Full text Cite

Physics with CEBAF at 12 GeV and future opportunities

Journal Article Progress in Particle and Nuclear Physics · November 1, 2022 We summarize the ongoing scientific program of the 12 GeV Continuous Electron Beam Accelerator Facility (CEBAF) and give an outlook into future opportunities. The program addresses important topics in nuclear, hadronic, and electroweak physics, including n ... Full text Cite

Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report

Journal Article Nuclear Physics A · October 1, 2022 This report describes the physics case, the resulting detector requirements, and the evolving detector concepts for the experimental program at the Electron-Ion Collider (EIC). The EIC will be a powerful new high-luminosity facility in the United States wi ... Full text Cite

Measurement of R=σL/σT and the separated longitudinal and transverse structure functions in the nucleon-resonance region

Journal Article Physical Review C · June 1, 2022 We report on a detailed study of longitudinal strength in the nucleon resonance region, presenting new results from inclusive electron-proton cross sections measured at Jefferson Lab Hall C in the four-momentum transfer range 0.2 Full text Cite

Proton Compton Scattering from Linearly Polarized Gamma Rays.

Journal Article Physical review letters · April 2022 Differential cross sections for Compton scattering from the proton have been measured at scattering angles of 55°, 90°, and 125° in the laboratory frame using quasimonoenergetic linearly (circularly) polarized photon beams with a weighted mean energy value ... Full text Cite

Measurement of spin density matrix elements in Λ(1520) photoproduction at 8.2-8.8 GeV

Journal Article Physical Review C · March 1, 2022 We report on the measurement of spin density matrix elements of the Λ(1520) in the photoproduction reaction γp→Λ(1520)K+, via its subsequent decay to K-p. The measurement was performed as part of the GlueX experimental program in Hall D at Jefferson Labora ... Full text Cite

Search for photoproduction of axionlike particles at GlueX

Journal Article Physical Review D · March 1, 2022 We present a search for axionlike particles, a, produced in photon-proton collisions at a center-of-mass energy of approximately 4 GeV, focusing on the scenario where the a-gluon coupling is dominant. The search uses a→γγ and a→π+π-π0 decays, and a data sa ... Full text Cite

The proton charge radius

Journal Article Reviews of Modern Physics · March 1, 2022 Nucleons (protons and neutrons) are the building blocks of atomic nuclei and are responsible for more than 99% of the visible matter in the Universe. Despite decades of efforts in studying its internal structure, there are still a number of puzzles surroun ... Full text Cite

International Workshop on Next Generation Gamma-Ray Source

Journal Article Journal of Physics G: Nuclear and Particle Physics · December 2, 2021 Link to item Cite

Measurement of the EMC effect in light and heavy nuclei

Journal Article Physical Review C · December 1, 2021 Inclusive electron scattering from nuclear targets has been measured to extract the nuclear dependence of the inelastic cross section (σA) in Hall C at the Thomas Jefferson National Accelerator facility. Results are presented for H2, He3, He4, B9, C12, Cu6 ... Full text Cite

An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

Journal Article European Physical Journal A · August 1, 2021 Positron beams, both polarized and unpolarized, are identified as important ingredients for the experimental programs at the next generation of lepton accelerators. In the context of the hadronic physics program at Jefferson Lab (JLab), positron beams are ... Full text Cite

The PRad windowless gas flow target

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · July 1, 2021 We report on a windowless, high-density, gas-flow target at Jefferson Lab that was used to measure rp, the root-mean-square charge radius of the proton. The target achieved its design goal of an areal density of 2 × 1018 atoms/cm ... Full text Cite

Measurement of the generalized spin polarizabilities of the neutron in the low-Q 2 region

Journal Article Nature Physics · June 1, 2021 Understanding the nucleon spin structure in the regime where the strong interaction becomes truly strong poses a challenge to both experiment and theory. At energy scales below the nucleon mass of about 1 GeV, the intense interaction among the quarks and g ... Full text Cite

Elastic positron–proton scattering at low Q 2

Journal Article European Physical Journal A · June 1, 2021 Systematic differences in the the proton’s charge radius, as determined by ordinary atoms and muonic atoms, have caused a resurgence of interest in elastic lepton scattering measurements. The proton’s charge radius, defined as the slope of the charge form ... Full text Cite

First measurement of the asymmetry and the Gerasimov-Drell-Hearn integrand from the He 3- (γ-,p) H 2 reaction at an incident photon energy of 29 MeV

Journal Article Physical Review C · March 1, 2021 The first measurement of the He3 - (γ - ,p)H2 process was performed at the High Intensity γ-ray Source (HIγS) facility at Triangle Universities Nuclear Laboratory using a circularly polarized, monoenergetic γ-ray beam and a longitudinally polarized He3 tar ... Full text Cite

Antimatter in the proton is more down than up.

Journal Article Nature · February 2021 Full text Cite

Advanced extraction of the deuteron charge radius from electron-deuteron scattering data

Journal Article Physical Review C · February 1, 2021 To extract the charge radius of the proton, rp, from the electron scattering data, the PRad collaboration at Jefferson Lab has developed a rigorous framework for finding the best functional forms - the fitters - for a robust extraction of rp from a wide va ... Full text Cite

Measurement of beam asymmetry for π- Δ++ photoproduction on the proton at Eγ=8.5 GeV

Journal Article Physical Review C · February 1, 2021 We report a measurement of the π- photoproduction beam asymmetry for the reaction γp→π-Δ++ using data from the GlueX experiment in the photon beam energy range 8.2-8.8 GeV. The asymmetry ς is measured as a function of four-momentum transfer t to the Δ++ an ... Full text Cite

Measurement of the 3He spin-structure functions and of neutron (3He) spin-dependent sum rules at 0.035 ≤ Q2 ≤ 0.24 GeV2

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · June 10, 2020 The spin-structure functions g1 and g2, and the spin-dependent partial cross-section σTT have been extracted from the polarized cross-sections differences, Δσ∥(ν,Q2) and Δσ⊥(ν,Q2) ... Full text Cite

Precision measurement of the neutral pion lifetime.

Journal Article Science (New York, N.Y.) · May 2020 The explicit breaking of the axial symmetry by quantum fluctuations gives rise to the so-called axial anomaly. This phenomenon is solely responsible for the decay of the neutral pion π0 into two photons (γγ), leading to its unusually short lifet ... Full text Cite

A small proton charge radius from an electron-proton scattering experiment.

Journal Article Nature · November 2019 Elastic electron-proton scattering (e-p) and the spectroscopy of hydrogen atoms are the two methods traditionally used to determine the proton charge radius, rp. In 2010, a new method using muonic hydrogen atoms1 found a substantial d ... Full text Cite

Measurement of the single-spin asymmetry Ay 0 in quasi-elastic 3He↑(e,e′n) scattering at 0.4 < Q2 < 1.0 GeV/c2

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · October 10, 2019 Due to the lack of free neutron targets, studies of the structure of the neutron are typically made by scattering electrons from either 2H or 3He targets. In order to extract useful neutron information from a 3He target, on ... Full text Cite

High precision measurement of Compton scattering in the 5 GeV region

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · October 10, 2019 The cross section of atomic electron Compton scattering γ+e→γ′+e′ was measured in the 4.400–5.475 GeV photon beam energy region by the PrimEx collaboration at Jefferson Lab with an accuracy of 2.6% and less. The results are consistent ... Full text Cite

Measurement of double-polarization asymmetries in the quasi-elastic He→3(e→,e′p) process

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 10, 2019 We report on a precise measurement of double-polarization asymmetries in electron-induced breakup of He3 proceeding to pd and ppn final states, performed in quasi-elastic kinematics at Q2=0.25(GeV/c)2 for missing momenta up to 250MeV/ ... Full text Cite

A new cryogenic apparatus to search for the neutron electric dipole moment

Journal Article Journal of Instrumentation · January 1, 2019 A cryogenic apparatus is described that enables a new experiment, nEDM@SNS, with a major improvement in sensitivity compared to the existing limit in the search for a neutron Electric Dipole Moment (EDM). This apparatus uses superfluid 4He to pr ... Full text Cite

Robust extraction of the proton charge radius from electron-proton scattering data

Journal Article Physical Review C · August 21, 2018 Background: Extracting the proton charge radius from electron scattering data requires determining the slope of the charge form factor at Q2 of zero. As experimental data cannot reach that limit, numerous methods for making the extraction have been propose ... Full text Cite

Experimental constraint on quark electric dipole moments

Journal Article Physical Review D · April 1, 2018 The electric dipole moments (EDMs) of nucleons are sensitive probes of additional CP violation sources beyond the standard model to account for the baryon number asymmetry of the universe. As a fundamental quantity of the nucleon structure, tensor charge i ... Full text Cite

New results on spin and 3D structure measurements

Conference Proceedings of Science · January 1, 2018 The nucleon spin structure has puzzled the physics community for about 30 years since the original discovery made by the EMC collaboration in late 1980s that the quark spin only contributes a small fraction to the nucleon spin. With major efforts from both ... Full text Cite

The TMD program at JLab

Conference Proceedings of Science · January 1, 2018 As a part of the general nucleon imaging effort, there have been many efforts to access the transverse momentum dependent parton distributions (TMDs) by using the semi-inclusive deep inelastic scattering (SIDIS) processes. The recently upgraded Continuous ... Full text Cite

Closing remarks at spin 2018 symposium

Conference Proceedings of Science · January 1, 2018 In this closing talk, I offer some personal reflection in the context of spin symposia on its global nature, its impact and also on the diverse spin related topics in various sub-fields of physics from some of the most recent symposia. Since the last Spin ... Cite

Nucleon 3D imaging program with soLID at Jefferson Lab

Conference Proceedings of Science · January 1, 2018 The 3D imaging of nucleon is at the frontier of understanding the visible Universe and QCD. There are many efforts to access the nucleon’s 3D partonic structure both in the transverse coordinate space (Generalized Parton Distributions) and in the transvers ... Cite

The 9th International Workshop on Chiral Dynamics 2018

Journal Article Proceedings of Science · January 1, 2018 Cite

Extraction of the neutron electric form factor from measurements of inclusive double spin asymmetries

Journal Article Physical Review C · December 26, 2017 Background: Measurements of the neutron charge form factor, GEn, are challenging because the neutron has no net charge. In addition, measurements of the neutron form factors must use nuclear targets which require accurately accounting for nuclear effects. ... Full text Cite

Measurement of the Vector and Tensor Asymmetries at Large Missing Momentum in Quasielastic (e[over →],e^{'}p) Electron Scattering from Deuterium.

Journal Article Physical review letters · November 2017 We report the measurement of the beam-vector and tensor asymmetries A_{ed}^{V} and A_{d}^{T} in quasielastic (e[over →],e^{'}p) electrodisintegration of the deuteron at the MIT-Bates Linear Accelerator Center up to missing momentum of 500  MeV/c. Data were ... Full text Cite

Search for a hidden strange baryon-meson bound state from φ production in a nuclear medium

Journal Article Physical Review C · May 8, 2017 We investigate the hidden strange light baryon-meson system. With the resonating-group method, two bound states, η′-N and φ-N, are found in the quark delocalization color screening model. Focusing on the φ-N bound state around 1950 MeV, we obtain the total ... Full text Cite

Unveiling the nucleon tensor charge at Jefferson Lab: A study of the SoLID case

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · April 10, 2017 Future experiments at the Jefferson Lab 12 GeV upgrade, in particular, the Solenoidal Large Intensity Device (SoLID), aim at a very precise data set in the region where the partonic structure of the nucleon is dominated by the valence quarks. One of the ma ... Full text Cite

Searching for new spin-dependent interactions with SmCo5 spin sources and a spin-exchange-relaxation-free comagnetometer

Journal Article Physical Review D · April 1, 2017 We propose a novel method to search for possible new macroscale spin- and/or velocity-dependent forces (SVDFs) based on specially designed SmCo5 spin sources and a spin exchange relaxation-free (SERF) comagnetometer. A simulation shows that, by covering a ... Full text Cite

First measurement of unpolarized semi-inclusive deep-inelastic scattering cross sections from a He 3 target

Journal Article Physical Review C · March 24, 2017 The unpolarized semi-inclusive deep-inelastic scattering (SIDIS) differential cross sections in He3(e,e′π±)X have been measured for the first time in Jefferson Lab experiment E06-010 with a 5.9GeVe- beam on a He3 gas target. The experiment focuses on the v ... Full text Cite

Measurements of d2n and A1n: Probing the neutron spin structure

Journal Article Physical Review D · September 6, 2016 We report on the results of the E06-014 experiment performed at Jefferson Lab in Hall A, where a precision measurement of the twist-3 matrix element d2 of the neutron (d2n) was conducted. The quantity d2n represents the average color Lorentz force a struck ... Full text Cite

Electron-Ion Collider: The next QCD frontier: Understanding the glue that binds us all

Journal Article European Physical Journal A · September 1, 2016 This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on the structure and interactions of gluon-dominated matter, with the intent to articulate it to the broader nuclear science community. It was commissioned by the managem ... Full text Open Access Cite

Non-uniformity effects of the inter-foil distance on GEM detector performance

Journal Article Chinese Physics C · April 1, 2016 The non-uniformity effect of the inter-foil distance has been studied using a gaseous electron multiplication (GEM) detector with sensitive area of 50mm × 50mm. A gradient of the inter-foil distance is introduced by using spacers with different heights at ... Full text Cite

Proton Charge Radius (PRad) Experiment at Jefferson Lab

Conference EPJ Web of Conferences · March 25, 2016 The puzzle of proton charge radius was recently raised by the measurement of muonic hydrogen Lamb shift at Paul Scherrer Institute (PSI), whose results were seven standard deviations smaller than the CODATA recommended value. To investigate this discrepanc ... Full text Cite

Experimental progress and status on nucleon electromagnetic form factors

Conference EPJ Web of Conferences · March 25, 2016 Nucleon electromagnetic form factors are the fundamental quantities that are related to a two-dimensional view of the charge and magnetization distribution in the nucleon. They are essential in understanding the nucleon electromagnetic structure. In this a ... Full text Cite

Experimental overview on GPDs and TMDs

Conference Proceedings of Science · January 1, 2016 The generalized parton distribution (GPD) functions and the transverse momentum dependent parton distribution (TMD) functions provide three-dimensional tomographies in the combined momentum-coordinate space (GPD) and the complete momentum space (TMD) of pa ... Cite

Measurement of the doubly-polarized He3→(γ→,n)pp reaction at 16.5 MeV and its implications for the GDH sum rule

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · November 12, 2015 We report new measurements of the double-polarized photodisintegration of 3He at an incident photon energy of 16.5 MeV, carried out at the High Intensity γ-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). Th ... Full text Cite

Measurement of the Target-Normal Single-Spin Asymmetry in Quasielastic Scattering from the Reaction (3)He(↑)(e,e').

Journal Article Physical review letters · October 2015 We report the first measurement of the target single-spin asymmetry, A(y), in quasielastic scattering from the inclusive reaction (3)He(↑)(e,e') on a (3)He gas target polarized normal to the lepton scattering plane. Assuming time-reversal invariance, this ... Full text Cite

Moments of the neutron g2 structure function at intermediate Q2

Journal Article Physical Review C - Nuclear Physics · July 15, 2015 We present new experimental results for the He3 spin structure function g2 in the resonance region at Q2 values between 1.2 and 3.0(GeV/c)2. Spin dependent moments of the neutron were extracted. Our main result, the inelastic contribution to the neutron d2 ... Full text Cite

Double spin asymmetries of inclusive hadron electroproduction from a transversely polarized He 3 target

Journal Article Physical Review C Nuclear Physics · July 14, 2015 We report the measurement of beam-target double spin asymmetries (A LT) in the inclusive production of identified hadrons, e + 3 He → h + X, using a longitudinally polarized 5.9-GeV electron beam and a transversely polarized He 3 target. Hadrons (π ±, K ±, ... Full text Cite

Precision measurements of A1n in the deep inelastic regime

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · May 1, 2015 We have performed precision measurements of the double-spin virtual-photon asymmetry A1 on the neutron in the deep inelastic scattering regime, using an open-geometry, large-acceptance spectrometer and a longitudinally and transversely polarized ... Full text Cite

Radiative corrections beyond the ultra relativistic limit in unpolarized ep elastic and Møller scatterings for the PRad Experiment at Jefferson Laboratory

Journal Article European Physical Journal A · January 1, 2015 The clear 7σ discrepancy between measurements of the proton charge radius from muonic hydrogen Lamb shifts and those from hydrogen Lamb shift and electron scattering lead to both intense theoretical and experimental efforts to understand and explain this d ... Full text Open Access Cite

Latest results on few-body physics from HIγS

Conference Proceedings of Science · January 1, 2015 In this talk we discuss the recently completed and upcoming experiments on few-nucleon targets at the High Intensity g-ray Source (HIγS) facility located at Triangle Universities Nuclear Laboratory (TUNL). Several experiments took place or are planned in o ... Cite

Measurement of double-polarization asymmetries in the quasielastic (3)He[→](e[→],e(')d) process.

Journal Article Physical review letters · December 2014 We present a precise measurement of double-polarization asymmetries in the ^{3}He[over →](e[over →],e^{'}d) reaction. This particular process is a uniquely sensitive probe of hadron dynamics in ^{3}He and the structure of the underlying electromagnetic cur ... Full text Cite

Measurement of "pretzelosity" asymmetry of charged pion production in semi-inclusive deep inelastic scattering on a polarized He 3 target

Journal Article Physical Review C Nuclear Physics · November 24, 2014 An experiment to measure single-spin asymmetries of semi-inclusive production of charged pions in deep-inelastic scattering on a transversely polarized He3 target was performed at Jefferson Laboratory in the kinematic region of 0.16 Full text Cite

Single spin asymmetries in charged kaon production from semi-inclusive deep inelastic scattering on a transversely polarized He 3 target

Journal Article Physical Review C Nuclear Physics · November 3, 2014 We report the first measurement of target single spin asymmetries of charged kaons produced in semi-inclusive deep inelastic scattering of electrons off a transversely polarized He3 target. Both the Collins and Sivers moments, which are related to the nucl ... Full text Cite

Precision measurement of the neutron twist-3 matrix element d(2)(n): probing color forces.

Journal Article Physical review letters · July 2014 Double-spin asymmetries and absolute cross sections were measured at large Bjorken x  (0.25≤x≤0.90), in both the deep-inelastic and resonance regions, by scattering longitudinally polarized electrons at beam energies of 4.7 and 5.9 GeV from a transversely ... Full text Cite

Measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the reaction (3)He(↑)(e,e')X.

Journal Article Physical review letters · July 2014 We report the first measurement of the target-normal single-spin asymmetry in deep-inelastic scattering from the inclusive reaction 3)He(↑)(e,e')X on a polarized (3)He gas target. Assuming time-reversal invariance, this asymmetry is strictly zero in the Bo ... Full text Cite

Searches for possible T-odd and P-odd short range interactions using polarized nuclei

Journal Article EPJ Web of Conferences · April 14, 2014 Various theories predict the possible existence of T-odd and P-odd shortrange forces between spin 1/2 fermions, proportional to S· r where S is the fermion spin and r is the separation between particles. We use ensembles of polarized nuclei and an un-polar ... Full text Cite

Single spin asymmetries of inclusive hadrons produced in electron scattering from a transversely polarized 3 He target

Journal Article Physical Review C Nuclear Physics · April 7, 2014 We report the first measurement of target single spin asymmetries (AN) in the inclusive hadron production reaction, e+3He↑→h+X, using a transversely polarized 3He target. The experiment was conducted at Jefferson Lab in Hall A using a 5.9-GeV electron beam ... Full text Cite

Spin-dependent cross sections from the three-body photodisintegration of He 3 at incident energies of 12.8 and 14.7 MeV

Journal Article Physical Review C Nuclear Physics · February 11, 2014 The first measurement of the three-body photodisintegration of polarized He3 using a circularly polarized photon beam has been performed at incident energies of 12.8 and 14.7 MeV. This measurement was carried out at the high-intensity γ-ray source located ... Full text Cite

A frequency determination method for digitized NMR signals

Journal Article Communications in Computational Physics · January 1, 2014 We present a high precision frequency determination method for digitized NMR FID signals. The method employs high precision numerical integration rather than simple summation as in many other techniques. With no independent knowledge of the other parameter ... Full text Cite

Studies of single-photoelectron response and of performance in magnetic field of a H8500C-03 photomultiplier tube

Journal Article Journal of Instrumentation · September 1, 2013 We studied the single-photoelectron detection capabilities of a multianode photomultiplier tube H8500C-03 and its performance in high magnetic field. Our results show that the device can readily resolve signals at the single photoelectron level making it s ... Full text Cite

Production of K+K- pairs in proton-proton collisions below the meson threshold

Journal Article Physical Review C Nuclear Physics · June 12, 2013 The pp→ppK+K- reaction was measured below the threshold at a beam energy of 2.568 GeV using the COSY-ANKE magnetic spectrometer. By assuming that the four-body phase space is distorted only by the product of two-body final-state inter ... Full text Cite

First measurements of spin-dependent double-differential cross sections and the Gerasimov-Drell-Hearn Integrand from 3He(γ,n)pp at incident photon energies of 12.8 and 14.7 MeV.

Journal Article Physical review letters · May 2013 The first measurement of the three-body photodisintegration of longitudinally polarized (3)He with a circularly polarized γ-ray beam was carried out at the High Intensity γ-ray Source facility located at Triangle Universities Nuclear Laboratory. The spin-d ... Full text Cite

A MRPC prototype for SOLID-TOF in JLab

Journal Article Journal of Instrumentation · March 1, 2013 A prototype of Multi-gap Resistive Plate Chamber (MRPC) for the future SoLID time of flight system at JLab has been developed. The counter, trapezoidal in shape, is assembled with the newly developed low-resistive Chinese glass. It has 10 × 0.25 mm gas gap ... Full text Cite

Progress on neutron-target multipoles above 1 GeV

Journal Article EPJ Web of Conferences · December 1, 2012 We report a new extraction of nucleon resonance couplings using π- photo-production cross sections on the neutron. The world database for the process γn → π-p above 1 GeV has quadrupled with the addition of new differential cross sect ... Full text Cite

Virtual Compton scattering and the generalized polarizabilities of the proton at Q2=0.92 and 1.76 GeV2

Journal Article Physical Review C Nuclear Physics · July 25, 2012 Virtual Compton scattering (VCS) on the proton has been studied at the Jefferson Laboratory using the exclusive photon electroproduction reaction ep→epγ. This paper gives a detailed account of the analysis which has led to the determination of the structur ... Full text Cite

Amplitude analysis of γn→π-p data above 1 GeV

Journal Article Physical Review C Nuclear Physics · July 12, 2012 We report an extraction of nucleon resonance couplings using π- photoproduction cross sections on the neutron. The world database for the process γn→π-p above 1 GeV has quadrupled with the addition of differential cross sections from ... Full text Cite

The radial structure of the proton and its constituents

Journal Article Aip Conference Proceedings · May 10, 2012 Understanding how quantum chromodynamics, the theory of strong interaction, works in the low-energy region, the so-called confinement region is one of the major challenges facing physicists. The structure of nucleon is one of the most active areas of resea ... Full text Cite

Production of K+K- pairs in proton-proton collisions at 2.83 GeV

Journal Article Physical Review C Nuclear Physics · March 30, 2012 Differential and total cross sections for the pp→ppK+K- reaction have been measured at a proton beam energy of 2.83 GeV using the COSY-ANKE magnetic spectrometer. Detailed model descriptions fitted to a variety of one-dimensional distributions permit the s ... Full text Cite

Search for spin-dependent short-range force between nucleons using optically polarized He3 gas

Journal Article Physical Review D Particles Fields Gravitation and Cosmology · February 23, 2012 We propose a new method to detect short-range P- and T-violating interactions between nucleons, based on measuring the precession frequency shift of polarized He3 nuclei in the presence of an unpolarized mass. To maximize the sensitivity, a high-pressure H ... Full text Cite

A Practical Method to Determine the Spatial Resolution of GEM Detector

Journal Article Nucl. Inst. and Methods · 2012 Cite

Precise measurement of deuteron tensor analyzing powers with BLAST.

Journal Article Physical review letters · December 2011 We report a precision measurement of the deuteron tensor analyzing powers T(20) and T(21) at the MIT-Bates Linear Accelerator Center. Data were collected simultaneously over a momentum transfer range Q=2.15-4.50 fm(-1) with the Bates Large Acceptance Spect ... Full text Cite

General solution to gradient-induced transverse and longitudinal relaxation of spins undergoing restricted diffusion

Journal Article Physical Review A Atomic Molecular and Optical Physics · November 14, 2011 We develop an approach, by calculating the autocorrelation function of spins, to derive the magnetic field gradient-induced transverse (T2) relaxation of spins undergoing restricted diffusion. This approach is an extension to the method adopted ... Full text Cite

Properties of the resonance Λ(1520) as seen in the forward electroproduction at JLab hall A

Journal Article Aip Conference Proceedings · November 10, 2011 High-resolution spectrometer measurements of the reaction H(e,e′K+)X at small Q2 are used to extract the mass and width of the Λ(1520). We investigate dependence of the resonance parameters on different parametrizations of the backgro ... Full text Cite

Spin-dependent electron scattering from polarized protons and deuterons with the BLAST experiment at MIT-bates

Journal Article Annual Review of Nuclear and Particle Science · November 7, 2011 The Bates Large Acceptance Spectrometer Toroid (BLAST) experiment was operated at the MIT-Bates Linear Accelerator Center from 2003 until 2005. The experiment was designed to exploit the power of a polarized electron beam incident on polarized targets of h ... Full text Cite

Extracting the photoproduction cross sections off the neutron, via the γn→π-p reaction, from deuteron data with final-state interaction effects

Journal Article Physical Review C Nuclear Physics · September 9, 2011 The incoherent pion photoproduction reaction γd→π -pp is considered theoretically in a wide energy region E th≤Eγ≤2700 MeV. The model applied contains the impulse approximation as well as the NN and πN final-state-interacti ... Full text Cite

Hadron physics at low energies

Journal Article European Physical Journal Special Topics · September 1, 2011 Understanding how quantum chromodynamics, the theory of strong interaction, works in the low-energy region, the so-called confinement region is one of the major challenges facing physicists. Low energy hadron physics, particularly the structure of hadron i ... Full text Cite

Pressure dependence of wall relaxation in polarized He3 gaseous cells

Journal Article Physical Review A Atomic Molecular and Optical Physics · June 16, 2011 We have observed a linear pressure dependence of longitudinal relaxation time T1 at 4.2 and 295 K in gaseous He3 cells made of either bare Pyrex glass or Cs- or Rb-coated Pyrex due to paramagnetic sites in the cell wall. The paramagnetic wall re ... Full text Cite

Search for the neutron electric dipole moment: Contributions from the triangle universities nuclear laboratory

Conference Proceedings of the 2011 Meeting of the Division of Particles and Fields of the American Physical Society, DPF 2011 · January 1, 2011 © Proceedings of the 2011 Meeting of the Division of Particles and Fields of the American Physical Society, DPF 2011. All rights reserved. A significant fraction of the research effort at the Triangle Universities Nuclear Laboratory (TUNL) focuses on weak ... Cite

Search for the neutron electric dipole moment: Contributions from the triangle universities nuclear laboratory

Conference Proceedings of the 2011 Meeting of the Division of Particles and Fields of the American Physical Society Dpf 2011 · January 1, 2011 A significant fraction of the research effort at the Triangle Universities Nuclear Laboratory (TUNL) focuses on weak interaction studies and searches for physics beyond the Standard Model. One major effort is the development of a new experimental technique ... Cite

Future (transverse) spin physics at Jefferson Lab

Journal Article Journal of Physics Conference Series · January 1, 2011 The studies of GPDs and TMDs with polarizations at 6 GeV at Jefferson Lab have already shown great promises. The 12-GeV spin program will significantly advance our knowledge about the three-dimensional structure of the nucleon in the valence quark region, ... Full text Cite

Properties of the ∧(1520) resonance from high-precision electroproduction data

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · November 1, 2010 High-resolution spectrometer measurements of the reaction H(e,e'K+)X at small Q2 are used to extract the mass and width of the "(1520). We investigate the influence of various assumptions used in the extraction. The width appears to be more sens ... Full text Cite

Experimental study of the A(e,e′π+) reaction on H1, H2, C12, Al27, Cu63, and Au197

Journal Article Physical Review C Nuclear Physics · May 25, 2010 Cross sections for the H1(e,e′π+)n process on H1, H2, C12, Al27, Cu63, and Au197 targets were measured at the Thomas Jefferson National Accelerator Facility (Jefferson Lab) to extract nuclear transparencies. Data were taken from Q2=1.1-4.7 GeV2 ... Full text Open Access Cite

A high-pressure polarized 3He gas target for nuclear-physics experiments using a polarized photon beam

Journal Article European Physical Journal A · April 1, 2010 Following the first experiment on three-body photodisintegration of polarized 3He utilizing circularly polarized photons from High-Intensity Gamma Source (HIγS) at Duke Free Electron Laser Laboratory (DFELL), a new high-pressure polarized 3 ... Full text Cite

Recent results on structure functions

Conference Proceedings of Science · January 1, 2010 Significant progress has been made in recent years in both unpolarized structure functions of the nucleon as well as polarized structure functions. More recently, both experimental and theoretical studies of the structure of the nucleon have advanced beyon ... Cite

Role of mesons in the electromagnetic form factors of the nucleon

Journal Article Physical Review C Nuclear Physics · January 1, 2010 The roles played by mesons in the electromagnetic form factors of the nucleon are explored using as a basis a model containing vector mesons with coupling to the continuum together with the asymptotic Q2 behavior of perturbative QCD. Specificall ... Full text Open Access Cite

Nucleon transversity study using a polarized 3He target in Hall A at JLab

Journal Article Nuclear Physics A · January 1, 2010 A first measurement of Single target Spin Asymmetry (SSA) from semi-inclusive electro-production of charged pions from a transversely polarized 3He target in Deep-Inelastic-Scattering kinematics was completed in Hall A at Jefferson Lab in early ... Full text Cite

Charged pion photoproduction

Journal Article Aip Conference Proceedings · December 1, 2009 We extracted the differential cross section for the γn → π- p process from a deuterium target using the CLAS detector at Jefferson Lab in Hall B for photon energies between 1.0 and 3.5 GeV and pion center-of-mass (c.m.) angles (θc.m.) ... Full text Cite

New measurements of the European Muon Collaboration effect in very light nuclei.

Journal Article Physical review letters · November 2009 New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from (2)H, (3)He, (4)He, (9)Be and (12)C for 0.3 < x < 0.9, Q(2) approximately 3-6 GeV(2). These data represent the first measurement of the EMC effect for (3)He ... Full text Cite

The extraction of ϕ - N total cross section from d (γ, p K+ K-) n

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · October 12, 2009 We report on the first measurement of the differential cross section of φ{symbol}-meson photoproduction for the d (γ, p K+ K-) n exclusive reaction channel. The experiment was performed using a tagged-photon beam and the CEBAF Large A ... Full text Cite

Relaxation of spin-polarized H3 e in mixtures of H3 e and H4 e at about 330 mK

Journal Article Physical Review A Atomic Molecular and Optical Physics · August 5, 2009 We report the measurements of depolarization probabilities of polarized H3 e in a rectangular acrylic cell with a deuterated tetraphenyl butadiene-doped deuterated polystyrene coating filled with superfluid H4 e at ∼330mK with a magnetic holding field of ∼ ... Full text Cite

Study of semi-inclusive deep inelastic (e, e'π±) production with a polarized3He target

Conference Aip Conference Proceedings · August 4, 2009 The 12 GeV upgrade at Jefferson Lab will open a new era of precision measurement of the Transverse Momentum Dependent parton distribution functions (TMDs) through the Semi-Inclusive Deep-Inelastic Scattering (SIDIS). In this talk, we discussed the projecte ... Full text Cite

The BLAST experiment

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · May 21, 2009 The Bates large acceptance spectrometer toroid (BLAST) experiment was operated at the MIT-Bates Linear Accelerator Center from 2003 until 2005. The detector and experimental program were designed to study, in a systematic manner, the spin-dependent electro ... Full text Cite

New results from the bates large acceptance spectrometer toroid (blast)

Journal Article International Journal of Modern Physics E · February 1, 2009 An experiment using the novel technique of scattering a longitudinally polarized electron beam from polarized internal hydrogen/deuterium gas targets was carried out in the South Hall Ring at the MIT-Bates Accelerator Center. The scattered particles were d ... Full text Cite

Virtual Compton scattering and neutral pion electroproduction in the resonance region up to the deep inelastic region at backward angles

Journal Article Physical Review C Nuclear Physics · January 5, 2009 We have made the first measurements of the virtual Compton scattering (VCS) process via the H(e, e'p)γ exclusive reaction in the nucleon resonance region, at backward angles. Results are presented for the W-dependence at fixed Q2=1 GeV2 and for the Q2 depe ... Full text Cite

Study of the GDH sum rule of 3He at HIGS

Conference Proceedings of Science · January 1, 2009 In this talk, we discuss an experiment that has been conducted recently at the High Intensity Gamma Source (HIGS) facility at the Duke Free Electron Laser Laboratory (DFELL) on three-body photodisintegration of circularly polarized photons from a longtudin ... Cite

Performance of the two aerogel Cherenkov detectors of the JLab hall a hadron spectrometer

Journal Article Nuovo Cimento Della Societa Italiana Di Fisica B · January 1, 2009 We report on the design and commissioning of two silica aerogel Cherenkov detectors with different refractive indices. In particular, very high performance in terms of the number of detected photoelectrons was achieved through an appropriate choice of PMT ... Full text Cite

New measurements of the EMC effect in very light nuclei

Journal Article Phys. Rev. Lett. · 2009 Cite

Charge form factor of the neutron at low momentum transfer from the 2H-->(e-->,e'n)1H reaction.

Journal Article Physical review letters · July 2008 We report new measurements of the neutron charge form factor at low momentum transfer using quasielastic electrodisintegration of the deuteron. Longitudinally polarized electrons at an energy of 850 MeV were scattered from an isotopically pure, highly pola ... Full text Cite

He-3 Spin-Dependent Cross Sections and Sum Rules

Journal Article Physical Review Letters · 2008 Cite

Quark-Hadron Duality in Neutron (3He) Spin Structure

Journal Article Physical Review Letters · 2008 Cite

Scaling Study of the Pion Electroprodeuction Cross Sections

Journal Article Physical Review C · 2008 Cite

Research Opportunities at the Upgraded HIGS Facility

Journal Article Progress in Particle and Nuclear Physics · 2008 Cite

Preface

Journal Article Chiral Dynamics 2006 Proceedings of the 5th International Workshop on Chiral Dynamics Theory and Experiment Cd 2006 · December 1, 2007 Cite

Spin-dependent compton scattering from 3He and the neutron spin polarizabilities

Journal Article Chiral Dynamics 2006 Proceedings of the 5th International Workshop on Chiral Dynamics Theory and Experiment Cd 2006 · December 1, 2007 A new experiment is being planned at the High Intensity Gamma Source (HIγS) at Duke Free Electron Laboratory for first measurements of the spin-dependent asymmetries from elastic Compton scattering of circularly polarized photons from a high-pressure polar ... Cite

Neutron transversity measurement at Jefferson Lab with a polarized 3He target

Journal Article Few Body Systems · December 1, 2007 A first measurement of single target spin asymmetry (SSA) from semi-inclusive electroproduction of charged pions from a transversely polarized 3He target in deep-inelastic-scattering kinematics will take data in Hall A at Jefferson Lab in 2008. ... Full text Cite

Measurement of coherent -meson photoproduction from the deuteron at low energies

Journal Article Physical Review C Nuclear Physics · November 21, 2007 The cross section and decay angular distributions for the coherent -meson photoproduction on the deuteron have been measured for the first time up to a squared four-momentum transfer t=(pγ-p)2=-2 GeV2/c2, using the CLAS detector at the Thomas Jefferson Nat ... Full text Cite

A high-pressure polarized 3He gas target for the High Intensity Gamma Source (HIγS) facility at Duke Free Electron Laser Laboratory

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · November 21, 2007 A new polarized 3He target has been developed for nuclear physics experiments utilizing the High Intensity Gamma Source (HIγS) at the Duke Free Electron Laser Laboratory (DFELL). This target is designed for a broad program of physics employing h ... Full text Cite

Search for the N bound state from meson subthreshold production

Journal Article Physical Review C Nuclear Physics · May 30, 2007 The subthreshold photoproduction of mesons from heavy nuclear targets has been suggested as a candidate to search for the -N bound state, a quantum chromodynamics molecular state. In this Brief Report, we present detailed Monte Carlo studies to demonstrate ... Full text Cite

-Measurement of the proton's electric to magnetic form factor ratio from 1H(over -->)(e(over -->),e'p).

Journal Article Physical review letters · February 2007 We report the first precision measurement of the proton electric to magnetic form factor ratio from spin-dependent elastic scattering of longitudinally polarized electrons from a polarized hydrogen internal gas target. The measurement was performed at the ... Full text Cite

Measurement of Nuclear Transparency for the $A(e,e'\pi^+)$ Reaction

Journal Article Physical Review Letters · 2007 Cite

Coherent Phi-meson Photoproduction on Deuteron at Low Energies

Journal Article Physical Review C (Rapid Communications) · 2007 Cite

New results from BLAST on the nucleon electromagnetic form factors

Journal Article Aip Conference Proceedings · December 1, 2006 Recently, a new experiment was carried out in the South Hall Ring at the MIT-Bates Accelerator Laboratory. This experiment utilized a polarized electron beam, a pure hydrogen (deuterium) internal polarized gas target, and the symmetric Bates Large Acceptan ... Full text Cite

Laser-driven nuclear-polarized hydrogen internal gas target

Journal Article Physical Review A Atomic Molecular and Optical Physics · June 23, 2006 We report the performance of a laser-driven polarized internal hydrogen gas target (LDT) in a configuration similar to that used in scattering experiments. This target used the technique of spin-exchange optical pumping to produce nuclear spin polarized hy ... Full text Cite

Compton scattering from a high pressure polarized He-3 target at HI gamma S

Conference CZECHOSLOVAK JOURNAL OF PHYSICS · January 1, 2006 Link to item Cite

Laser-driven target of high-density nuclear-polarized hydrogen gas

Journal Article Physical Review A Atomic Molecular and Optical Physics · January 1, 2006 We report the best figure-of-merit achieved for an internal nuclear polarized hydrogen gas target and a Monte Carlo simulation of spin-exchange optical pumping. The dimensions of the apparatus were optimized using the simulation, and the experimental resul ... Full text Cite

Pion photoproduction on the nucleon

Journal Article Aip Conference Proceedings · December 1, 2005 The γn → π-p and γp → π+n reactions are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. The cross sections of these processes are also advantageous, fo ... Full text Cite

Q2 dependence of the neutron spin structure function g2n at low Q2

Journal Article Physical Review Letters · September 30, 2005 We present the first measurement of the Q2 dependence of the neutron spin structure function g2n at five kinematic points covering 0.57(GeV/c) 2â‰Q2â‰1.34(GeV/c)2 at xâ‰σ0.2. Though the naive quark-parton model predicts g2=0, nonzero values occur in more r ... Full text Cite

Electroproduction of strangeness on Λ 3,4H bound states on Helium

Journal Article Aip Conference Proceedings · May 6, 2005 The A(e,e′K +)X reaction has been investigated at Jefferson Laboratory. Data were taken for Q 2 ≈ 0.35 GeV 2 at a beam energy of 3.245 GeV for 1H, 3He and 4He targets. Evidence for Λ-hypernu ... Full text Cite

Higher twists and color polarizabilities in the neutron

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · May 5, 2005 Color polarizabilities of the neutron are extracted from data on the lowest moment of the spin-dependent g1 structure function. New data in the resonance region from Jefferson Lab at Q2≲1 GeV2, in combination with world data at higher Q2, allow a systemati ... Full text Cite

Nucleon electromagnetic form factors

Journal Article International Journal of Modern Physics A · April 10, 2005 The nucleon electromagnetic form factors have been studied in the past extensively from unpolarized electron scattering experiments. With the development in polarized beam, recoil polarimetry, and polarized target technologies, polarization experiments hav ... Full text Cite

Laser-driven polarized H/D sources and targets

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · January 11, 2005 Traditionally, Atomic Beam Sources are used to produce targets of nuclear polarized hydrogen (H) or deuterium (D) for experiments using storage rings. Laser-Driven Sources (LDSs) offer a factor of 20-30 gain in the target thickness (however, with lower pol ... Full text Cite

Higher twists and Color Polarizabilities in the Neutron

Journal Article Physical Letters · 2005 Cite

Generalized counting rule and oscillatory scaling

Journal Article Physical Review C Nuclear Physics · January 1, 2005 We studied the energy dependence of the pp elastic scattering data and the pion-photoproduction data at a 90° c.m. angle in light of the new generalized counting rale derived for exclusive processes. We show that by including the helicity-nonconserving amp ... Full text Cite

Parity-Violating Electron Deuteron Scattering and the Proton's Neutral Weak Axial Vector Form Factor

Journal Article Physical Review Letters · March 12, 2004 The parity-violating asymmetry was investigated in quasielastic electron scattering from deuteron with determination of neutral weak axial vector form factor. The backward angles at Q2 = 0.038 (GeV/c)2 from deuteron scattering provided value of neutral wea ... Full text Cite

Q2 Evolution of the Neutron Spin Structure Moments using a 3He Target

Journal Article Physical Review Letters · January 16, 2004 The determination of Q2 evolution of the neutron spin structure by 3He in a double spin experiment was discussed. Measurements of spin structure functions g1 and g2 in deep inelastic lepton scattering (DIS) were used to unr ... Cite

Precision Measurement of the Neutron Spin Asymmetry A1 n and Spin-Flavor Decomposition in the Valence Quark Region

Journal Article Physical Review Letters · January 9, 2004 The neutron spin asymmetry A1n with high precision at three kinematic in the deep inelastic region at x=0.33, 0.47 and Q 2=2.7, 3.5 and 4.8(GeV/c)2, respectively was measured. It was shown that A1 ... Cite

Basic Instrumentation for Hall A at Jefferson Lab

Journal Article Nucl. Instrum. & Meth. · 2004 Cite

Measurement of the Generalized Forward Spin Polarizabilities

Journal Article Physical Review Letters · 2004 Cite

Measurement of the Generalized Polarizabilities of the proton

Journal Article Physical Review Letters · 2004 Cite

Parity-violating Electron Deuteron Scattering and the Proton's

Journal Article Physical Review Letters · 2004 Cite

Q2 Evolution of the Neutron Spin Structure Moments Using a 3He Target

Journal Article Physical Review Letters · 2004 Cite

Q2 Evolution of the Neutron Spin Structure Moments using a 3He Target

Journal Article Physical Review Letters · 2004 The determination of Q2 evolution of the neutron spin structure by 3He in a double spin experiment was discussed. Measurements of spin structure functions g1 and g2 in deep inelastic lepton scattering (DIS) were used to unravel the spin structure of the nu ... Cite

Near threshold electroproduction of the ω meson at Q 2≈0.5 GeV2

Journal Article Physical Review C Nuclear Physics · January 1, 2004 Electroproduction of the ω meson was investigated in 1H(e,e′p)ω reaction. The measurement was performed at a four-momentum transfer Q2≈0.5 GeV2. Angular distributions of the virtual photon-proton center-of-momentum cross se ... Full text Cite

Nuclear Transparency with the γn → π¯p Process in 4He

Journal Article Physical Review C (Rapid Communications) · August 2003 Cite

Charged pion photoproduction from hydrogen and deuterium at Jefferson Lab

Journal Article Modern Physics Letters A · February 28, 2003 The γn → π-p and γp → π+n reactions are essential probes of the transition from meson-nucleon degrees of freedom to quark-gluon degrees of freedom in exclusive processes. The cross sections of these processes are also advantageous, fo ... Full text Cite

Nucleon electromagnetic form factors

Journal Article International Journal of Modern Physics E · February 1, 2003 Nucleon electromagnetic form factors are fundamental quantities related to the charge and magnetization distributions inside the nucleon. Understanding the nucleon electromagnetic structure in terms of the underlying quark and gluon degrees of freedom of q ... Full text Cite

A Study of the (e,e’p) reaction on 12C, 56Fe and 197Au

Journal Article Phys. Rev. C (Rapid Communications) · 2003 Cite

Quasielastic (e,e′p) reaction on 12C, 56Fe, and 197Au

Journal Article Physical Review C - Nuclear Physics · 2003 We report the results from a systematic study of the quasielastic (e,e′p) reaction on 12C, 56Fe, and 197Au performed at Jefferson Lab. We have measured nuclear transparency and extracted spectral functions (corrected for radiation) over a Q 2 range of 0.64 ... Cite

Exclusive processes at Jefferson Lab

Journal Article Pramana Journal of Physics · January 1, 2003 Mapping the transition from strongly interacting, non-perturbative quantum chromodynamics, where nucleon-meson degrees of freedom are effective to perturbative QCD of quark and gluon degrees of freedom, is one of the most fundamental, challenging tasks in ... Full text Cite

Nuclear transparency with the γn → π-p process in 4He

Journal Article Physical Review C - Nuclear Physics · 2003 We have measured the nuclear transparency of the fundamental process γn → π-p in 4He. These measurements were performed at Jefferson Lab in the photon energy range of 1.6-4.5 GeV and at θcmπ = 70° and 90°. These measurements are the first of their kind in ... Cite

Plane-wave impulse approximation extraction of the neutron magnetic form factor from quasielastic 3He→(e→,e′) at Q2 = 0.3 to 0.6 (GeV/c)2

Journal Article Physical Review C - Nuclear Physics · 2003 A high precision measurement of the transverse spin-dependent asymmetry AT′ in 3He→(e→,e′) quasielastic scattering was performed in Hall A at Jefferson Lab at values of the squared four-momentum transfer, Q2, between 0.1 and 0.6 (GeV/c)2. AT′ is sensitive ... Cite

Plane-wave impulse approximation extraction of the neutron magnetic form factor from quasielastic [Formula Presented] at [Formula Presented] to [Formula Presented]

Journal Article Physical Review C - Nuclear Physics · January 1, 2003 A high precision measurement of the transverse spin-dependent asymmetry [Formula Presented] in [Formula Presented] quasielastic scattering was performed in Hall A at Jefferson Lab at values of the squared four-momentum transfer, [Formula Presented] between ... Full text Cite

Plane-wave impulse approximation extraction of the neutron magnetic form factor from quasielastic 3He→(e→,e′) at Q2 = 0.3 to 0.6 (GeV/c)2

Journal Article Physical Review C Nuclear Physics · January 1, 2003 A high precision measurement of the transverse spin-dependent asymmetry AT′ in 3He→(e→,e′) quasielastic scattering was performed in Hall A at Jefferson Lab at values of the squared four-momentum transfer, Q2 ... Full text Cite

Q2 evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a 3He target

Journal Article Physical Review Letters · December 9, 2002 The data on the scattering of polarized electrons from a polarized 3He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5°, was presented. The virtual photon cross-section difference σ1/2-σ3/2 ... Cite

Nuclear transparency from quasielastic A(e,e′p) reactions up to Q2 = 8.1 (GeV/c)2

Journal Article Physical Review C - Nuclear Physics · 2002 The quasielastic (e,e'p) reaction was studied on targets of deuterium, carbon, and iron up to a value of momentum transfer Q2 of 8.1 (GeV/c)2. A nuclear transparency was determined by comparing the data to calculations in the plane-wave impulse approximati ... Cite

Q2 evolution of the generalized Gerasimov-Drell-Hearn integral for the neutron using a 3He target

Journal Article Physical Review Letters · 2002 The data on the scattering of polarized electrons from a polarized 3He target at energies from 0.862 to 5.06 GeV, obtained at a scattering angle of 15.5°, was presented. The virtual photon cross-section difference σ1/2-σ3/2 was determined using this data. ... Cite

High energy angular distribution measurements of the exclusive deuteron photodisintegration reaction

Journal Article Physical Review C - Nuclear Physics · 2002 The first complete measurements of the angular distributions of the two-body deuteron photodisintegration differential cross section at photon energies above 1.6 GeV were performed at the Thomas Jefferson National Accelerator Facility. The results show a p ... Cite

Nucleon resonances with double polarization observables of pion photoproduction

Journal Article Physical Review C Nuclear Physics · January 1, 2002 The role of the nucleon resonances in the double polarization observables of pion photoproduction is investigated by using the resonance parameters predicted by Capstick and Roberts. As an example, we show that the not-well-determined two-star resonance N< ... Full text Cite

Precision measurement of the spin-dependent asymmetry in the threshold region of 3H→e(e→, e′)

Journal Article Physical Review Letters · December 10, 2001 Experiments were carried out for the first precision measurements of spin-dependent asymmetry in the threshold region of 3He→(e→, e′). The analysis was performed for the probing of 3He ground-state structure and extracting the neutron ... Cite

Precision measurement of the spin-dependent asymmetry in the threshold region of 3He(e, e').

Journal Article Physical review letters · December 2001 We present the first precision measurement of the spin-dependent asymmetry in the threshold region of 3He(e,e') at Q2 values of 0.1 and 0.2 (GeV/c)2. The agreement between the data and nonrelativistic Faddeev calculations which include both final-state int ... Full text Cite

Measurement of the high energy two-body deuteron photodisintegration differential cross section

Journal Article Physical Review Letters · September 3, 2001 The first measurements of the d(γ,p)n differential cross section up to Eγ=5.5 GeV were carried out. Results at θcm = 70° remain consistent with the scaling previously observed in JLAB E89-012. At θcm=53° there appears to be ... Cite

Electroproduction of kaons on light nuclei

Journal Article Nuclear Physics A · August 13, 2001 The A(e,e'Κ+)YX reaction on H, D, 3He, and 4He was investigated in Hall C at CE-BAF. Data were obtained for Q2 ≈ 0.35 and 0.5 GeV2 at 3.245 GeV. The missing mass spectra for both H and D are fitted wit ... Full text Cite

Three-nucleon interactions: Evidence from polarized pd elastic scattering

Journal Article Nuclear Physics A · June 18, 2001 Advances in precise computation of three-body reaction observables have spurred new interest in experimental measurements of proton deuteron elastic scattering, especially with regard to spin effects. Developments in spin-polarized internal targets for sto ... Full text Cite

Electroproduction of kaons and light hypernuclei

Journal Article Nuclear Physics A · March 12, 2001 Kaon electroproduction on hydrogen, deuterium and helium targets has been measured at a beam energy of 3.245 GeV and four-momentum transfer, Q2, ranging from 0.34 to 0.5 GeV2. Associated hyperon production off a nucleon in the deutero ... Full text Cite

Evidence for a three-nucleon-force effect in proton-deuteron elastic scattering

Journal Article Physical Review Letters · February 5, 2001 Developments in spin-polarized internal targets for storage rings have permitted measurements of 197 MeV polarized protons scattering from vector polarized deuterons. This work presents measurements of the polarization observables Ay, iT11< ... Full text Cite

Measurement of longitudinal spin transfer to Λ hyperons in deep-inelastic lepton scattering

Journal Article Physical Review D · 2001 Spin transfer in deep-inelastic Λ electroproduction has been studied with the HERMES detector using the 27.6 GeV polarized positron beam in the DESY HERA storage ring. For an average fractional energy transfer 〈z〉 = 0.45, the longitudinal spin transfer fro ... Cite

Measurement of the High Energy Two-Body Deuteron

Journal Article Phys. Rev. Lett. · 2001 Cite

Polarization measurements in high-energy deuteron

Journal Article Phys. Rev. Lett. · 2001 Cite

Phi-N bound state'

Journal Article Phys. Rev. C (Rapid Communications) · 2001 Cite

φ-N bound state

Journal Article Physical Review C Nuclear Physics · January 1, 2001 We show that the QCD van der Waals attractive potential is strong enough to bind a φ meson onto a nucleon inside a nucleus to form a bound state. The direct experimental signature for such an exotic state is proposed in the case of subthreshold φ meson pho ... Full text Cite

Transverse asymmetry AT' from the quasielastic 3He(e,e') process and the neutron magnetic form factor.

Journal Article Physical review letters · October 2000 We have measured the transverse asymmetry A(T') in 3He(e,e(')) quasielastic scattering in Hall A at Jefferson Laboratory with high precision for Q2 values from 0.1 to 0.6 (GeV/c)(2). The neutron magnetic form factor G(n)(M) was extracted based on Faddeev c ... Full text Cite

Experimental verification of quark-hadron duality

Journal Article Physical Review Letters · August 7, 2000 Quark-hadron duality was experimentally revisited using new inclusive data in the resonance region at large x. The original duality observations were verified. The quantum chromodynamics (QCD) moment explanation indicated that higher twist contributions to ... Full text Cite

Evidence for valencelike quark-hadron duality

Journal Article Physical Review Letters · August 7, 2000 The inclusive electron-nucleon scattering cross sections in the resonance region for both hydrogen and deuterium targets were measured. From these cross sections, the structure function F2 was extracted. The obtained data indicate that the F Full text Cite

Separated spectral functions for the quasifree [Formula Presented] reaction

Journal Article Physical Review C - Nuclear Physics · January 1, 2000 A separation of the longitudinal and transverse [Formula Presented] cross sections in the quasifree region has been performed in parallel kinematics at [Formula Presented] of 0.64 and 1.8 [Formula Presented] for initial proton momentum [Formula Presented] ... Full text Cite

Evidence for a single-spin azimuthal asymmetry in semi-inclusive pion electroproduction

Journal Article Physical Review Letters · January 1, 2000 Single-spin asymmetries for semi-inclusive pion production in deep-inelastic scattering have been measured for the first time. A significant target-spin asymmetry of the distribution in the azimuthal angle φ of the pion relative to the lepton scattering pl ... Full text Cite

The Transverse Asymmetry A_T' from Quasielastic 3 He(e,e')

Journal Article Phys. Rev. Lett. · 2000 Cite

Separated spectral functions for the quasifree 12C(e,e′p) reaction

Journal Article Physical Review C - Nuclear Physics · January 1, 2000 A separation of the longitudinal and transverse 12C(e,e′ p) cross sections in the quasifree region has been performed in parallel kinematics at Q2 of 0.64 and 1.8 GeV2 for initial proton momentum <80 MeV. The separated transverse and longitudinal spectral ... Full text Cite

Measurement of angular distributions and R = σL/σT in diffractive electroproduction of ρ0 mesons

Journal Article European Physical Journal C · 2000 Production and decay angular distributions were extracted from measurements of exclusive electroproduction of the ρ0(770) meson over a range in the virtual photon negative four-momentum squared 0.5 < Q2 < 4 GeV2 and the photon-nucleon invariant mass ... Cite

Exotic hadrons of minimal pentaquark (qqqqq̄) states

Journal Article Modern Physics Letters A · October 30, 1999 It is shown that the exotic non-qqq hadrons of pentaquark qqqqq̄ states can be clearly distinguished from the conventional qqq-baryon resonances or their hybrids if the flavor of q̄ is different from any of the other four quarks. We suggest the physical proc ... Full text Cite

Beam-Induced Nuclear Depolarization in a Gaseous Polarized-Hydrogen Target

Journal Article Physical Review Letters · February 8, 1999 Full text Cite

Coherent [Formula Presented] photoproduction on the deuteron up to 4 GeV

Journal Article Physical Review C - Nuclear Physics · January 1, 1999 The differential cross section for [Formula Presented] has been measured at deuteron center-of-mass angles of 90° and 136°. This work reports the first data for this reaction above a photon energy of 1 GeV, and permits a test of the apparent constituent co ... Full text Cite

Observation of a coherence length effect in exclusive rho_0

Journal Article Phys. Rev. Lett. · 1999 Cite

Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · January 1, 1999 Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized positrons on polarized hydrogen and He targets, in the kinematic range 0.023 < x ... Full text Cite

Coherent π0 photoproduction on the deuteron up to 4 GeV

Journal Article Physical Review C - Nuclear Physics · January 1, 1999 The differential cross section for 2H(γ,d)π0 has been measured at deuteron center-of-mass angles of 90° and 136°. This work reports the first data for this reaction above a photon energy of 1 GeV, and permits a test of the apparent constituent counting rul ... Full text Cite

Measurements of the deuteron elastic structure function A(Q2) for 0.7 ≤ Q2 ≤ 6.0(GeV/c)2at jefferson laboratory

Journal Article Physical Review Letters · January 1, 1999 The deuteron elastic structure function A(Q2) has been extracted in the range 0.7 ≤ Q2 ≤ 6.0(GeV/c)2 from cross section measurements of elastic electron-deuteron scattering in coincidence using the Hall A Facility of Jeffer ... Full text Cite

Observation of a coherence length effect in exclusive ρ0 Electroproduction

Journal Article Physical Review Letters · January 1, 1999 Exclusive incoherent electroproduction of the ρ0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q2 > 0.4GeV2 Full text Cite

Determination of the deep inelastic contribution to the generalised Gerasimov-Drell-Hearn integral for the proton and neutron

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 24, 1998 The virtual photon absorption cross section differences [σ1/2 - σ3/2] for the proton and neutron have been determined from measurements of polarised cross section asymmetries in deep inelastic scattering of 27.5 GeV longitudinally pol ... Full text Cite

The HERMES polarized 3He internal gas target

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · December 11, 1998 The HERMES experiment is investigating the spin structure of the proton and neutron via deep-inelastic scattering of polarized positrons from polarized nuclear targets. The polarized positrons are provided by the HERA positron storage ring at DESY, Hamburg ... Full text Cite

Measurement of the proton spin structure function g1p with a pure hydrogen target

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 3, 1998 A measurement of the proton spin structure function g1p(x,Q2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron beam at HERA incident on a longitudinally pola ... Full text Cite

Nuclear tensor polarization in a laser-driven polarized deuterium internal target

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · November 11, 1998 We present the results of the first direct measurement of nuclear polarization in an optically pumped spin-exchange polarized deuterium target. Measurements of the nuclear tensor polarization pzz are made in a storage cell as a function of flow ... Full text Cite

The HERMES Spectrometer

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · November 11, 1998 The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and 3He. These data give information on the spin structure of the nucleon. This paper descr ... Full text Cite

Effective neutron targets

Journal Article Nuclear Physics A · March 2, 1998 Because of the lack of a free neutron target, deuterium targets have been used extensively in studying the neutron structure. The unique spin structure of the 3He ground state wave function and the recent developments in laser technologies made polarized 3 ... Full text Cite

Precise measurement of the neutron magnetic form factor from quasielastic 3→He(→e, e′)

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · January 11, 1998 Polarized 3He targets have proven to be a useful tool for studying the electric and magnetic form factors of the neutron, and the spin structure of the neutron. The neutron magnetic form factor at low Q2 was previously determined at M ... Full text Cite

Measurements of deuteron photodisintegration up to 4.0 GeV

Journal Article Physical Review Letters · January 1, 1998 The first measurements of the differential cross section for the d(γ, p)n reaction up to 4.0 GeV were performed at the Continuous Electron Beam Accelerator Facility (CEBAF) at Thomas Jefferson Laboratory. We report the cross sections at the proton center-o ... Full text Cite

Quasifree (e, e′p) reactions and proton propagation in nuclei

Journal Article Physical Review Letters · January 1, 1998 The (e, e′p) reaction was studied on targets of C, Fe, and Au at momentum transfers squared Q2 of 0.6, 1.3, 1.8, and 3.3GeV2 in a region of kinematics dominated by quasifree electron-proton scattering. Missing energy and missing momen ... Full text Cite

Flavor asymmetry of the light quark sea from semi-inclusive deep-inelastic scattering

Journal Article Physical Review Letters · January 1, 1998 The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < x < 0.3 and 1 < Q2 < 10GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [d¯(x)- ¯u(x)]/[u(x)-d(x ... Full text Cite

Measurement of the neutron spin structure function gn1 with a polarized 3He internal target

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · July 10, 1997 Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function gn1(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polariz ... Full text Cite

Measurement of the proton’s neutral weak magnetic form factor

Journal Article Physical Review Letters · January 1, 1997 We report the first measurement of the parity-violating asymmetry in elastic electron scattering from the proton. The asymmetry depends on the neutral weak magnetic form factor of the proton which contains new information on the contribution of strange qua ... Full text Cite

Measurement of the neutron spin structure function gn1 with a polarized 3He internal target

Journal Article Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · 1997 Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function gn1(x, Q2) in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized 3He internal gas target. The d ... Cite

gamma n --> pi(-)p process in He-4 and O-16

Journal Article Physical Review C · November 1996 Cite

Inclusive electron scattering from nuclei at x≃1

Journal Article Physical Review C - Nuclear Physics · January 1, 1996 The inclusive A(e,e′) cross section for x≃1 was measured on 2H, C, Fe, and Au for momentum transfers Q2 from 1 to 6.8 (GeV/c)2. The scaling behavior of the data was examined in the region of transition from y scaling to x scaling. Throughout this transitio ... Full text Cite

γn → π- p process in 4He and 16O

Journal Article Physical Review C Nuclear Physics · January 1, 1996 Nuclear transparencies for the fundamental process γn → π- p on 4He and 16O have been calculated using nucleon configurations obtained from realistic ground-state wave functions by the Monte Carlo method. Comparisons betwee ... Full text Cite

A-dependence of nuclear transparency in quasielastic A(e, ef'p) at high Q2

Journal Article Physics Letters B · May 25, 1995 The A-dependence of the quasielastic A(e, ef'p) reaction has been studied at SLAC with 2H, C, Fe, and Au nuclei at momentum transfers Q2 = 1, 3, 5, and 6.8 (GeV/c)2. We extract the nuclear transparency T(A, Q2), ... Full text Cite

Exclusive electron scattering from deuterium at high momentum transfer

Journal Article Physical Review Letters · January 1, 1995 Cross sections are presented for the reaction H2(e,e′p)n for momentum transfers in the range 1.2≤Q2≤6.8 (GeV/c)2 and for missing momenta from 0 to 250 MeV/c. The longitudinal-transverse interference structure function has been separated at Q2=1.2 (GeV/c)2. ... Full text Cite

2-body photodisintegration of the deuteron up to 2.8 gev

Journal Article Physical Review Letters · January 1995 Cite

Evidence for virtual Compton scattering from the proton

Journal Article Physical Review D · January 1, 1995 In virtual Compton scattering an electron is scattered off a nucleon such that the nucleon emits a photon. We show that these events can be selected experimentally, and present the first evidence for virtual Compton scattering from the proton in data obtai ... Full text Cite

Measurement of the spin-dependent asymmetry in 3(e,e) inelastic scattering at low energy transfer

Journal Article Physical Review C · January 1, 1995 We present the results of a measurement of the spin-dependent asymmetry in 3(e,e) inelastic scattering at kinematics on the low-energy transfer side of the quasielastic peak, including the region near the breakup threshold. Comparison with existing calcula ... Full text Cite

Transverse-longitudinal asymmetry in the quasielastic He→3(e→,e′) reaction

Journal Article Physical Review Letters · January 1, 1995 The transverse-longitudinal asymmetry ATL′ in He→3(e→,e′) quasielastic scattering at momentum transfer Q2=0.14 (GeV/c)2 has been measured to be 1.52 ± 0.55(stat) ± 0.15(syst)%. The plane wave impulse approximation (PWIA) prediction for this measurement ran ... Full text Cite

Two-body photodisintegration of the deuteron up to 2.8 GeV

Journal Article Physical Review Letters · January 1, 1995 Measurements were performed for the photodisintegration cross section of the deuteron for photon energies from 1.6 to 2.8 GeV and center-of-mass angles from 37°to 90°. The measured energy dependence of the cross section at θc.m.=90°is in agreement with the ... Full text Cite

Momentum transfer dependence of nuclear transparency from the quasielastic C12(e,e'p) reaction

Journal Article Physical Review Letters · January 1, 1994 The cross section for quasielastic C12(e,e'p) scattering has been measured at momentum transfer Q2=1, 3, 5, and 6.8 (GeV/c)2. The results are consistent with scattering from a single nucleon as the dominant process. The nuclear transparency is obtained and ... Full text Cite

Measurement of the neutron magnetic form factor from inclusive quasielastic scattering of polarized electrons from polarized He3

Journal Article Physical Review C · January 1, 1994 We report a measurement of the asymmetry in spin-dependent quasielastic scattering of longitudinally polarized electrons from a polarized He3 target. The neutron magnetic form factor GMn has been extracted from the measured asymmetry based on recent PWIA c ... Full text Cite

NMR calibration of optical measurement of nuclear polarization in He3

Journal Article Physical Review A · January 1, 1993 We have performed precise NMR measurements in order to calibrate a standard optical technique for measuring the polarization of He3 nuclei. This optical technique requires knowledge of the pressure-dependent relationship between the nuclear polarization an ... Full text Cite