Journal ArticlePhysical Review C · December 1, 2024
Cross sections for the Au197(γ,n) reaction are broadly used in nuclear physics as a standard for normalizing photonuclear reaction cross-section data at photon beam energies above approximately 8 MeV. In this paper, we report cross-section measurements for ...
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ConferenceProceedings of Science · July 30, 2024
I discussed the importance of the T20 quantity, a tensor analyzing power, and the basic experimental setup for a measurement of ↔ d (γ→, n)p, the deuteron photodisintegration. Multiple measurements have suggested the existence of a channel around 9 MeV abo ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · June 1, 2024
The masses of thin, electroplated deposits of 235U, 238U and 239Pu on titanium backings have been determined to better than 1.3% precision by employing three complementary measurement techniques: α spectrometry, 2π gas counting, and γ-ray spectrometry. A d ...
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Journal ArticlePhysical Review C · April 1, 2024
An extensive dataset of cumulative fission product yields has been generated under a joint collaboration between Los Alamos National Laboratory (LANL), Lawrence Livermore National Laboratory (LLNL), and the Triangle Universities Nuclear Laboratory (TUNL). ...
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Journal ArticlePhysical review letters · August 2023
We report on new measurements establishing the existence of low-lying isomeric states in ^{136}Cs using γ rays produced in ^{136}Xe(p,n)^{136}Cs reactions. Two states with O(100) ns lifetimes are placed in the decay sequence of the ^{136}Cs levels that ar ...
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Journal ArticlePhysical Review C · May 1, 2023
We present cumulative fission product yields from the U238(n,f) reaction at an incident energy of 4.6 MeV for fission products with half-lives from less than one second to several hours. We employed direct γ-ray spectroscopy to measure unseparated fission ...
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Journal ArticlePhysical Review C · March 1, 2023
Background: High-accuracy data are needed to advance microscopic descriptions of the nuclear fission process, to improve the predictive precision of phenomenological models, and for applications in nuclear energy and homeland security. Purpose: The main go ...
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Conference16th Varenna Conference on Nuclear Reaction Mechanisms, NRM2023 · January 1, 2023
The energy dependence of high-yield fission products has been measured using quasi-monoenergetic neutron beams at energies between 5.5 and 11.0 MeV. The absolute number of fissions during the irradiation period was determined via dual-fission ionization ch ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · December 10, 2022
We report the most precise determination of the S01 neutron-neutron effective range parameter (rnn) from neutron-neutron quasifree scattering in neutron-deuteron breakup. The experiment setup utilized a collimated beam of 15.5 MeV neutrons and an array of ...
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Journal ArticlePhysical 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 ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · February 11, 2022
A Rapid Belt-driven Irradiated Target Transfer System, named RABITTS, was developed for use at the Triangle Universities Nuclear Laboratory. This system allows for cyclic activation with neutron or photon beams, and measurement of reaction products using γ ...
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Journal ArticlePhysical Review Applied · March 1, 2021
Isomeric fission products, such as 134mTe (T1/2=164 ns) and 136mXe (T1/2=2.95μs), are proposed as a signature of special nuclear materials in active interrogation applications. To test this conjecture, monoenergetic 9, 11, and 13 MeV photons from the HIγS ...
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Journal ArticlePhysical Review Research · June 3, 2020
The neutron beams produced by the Soreq Applied Research Accelerator Facility (SARAF) operating with the liquid lithium target (LiLiT) present scientific opportunities in nuclear astrophysics. Of interest are measurements (in our setup) of 1.5 to 3.0 MeV a ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · March 1, 2020
Digitization of detector signals enables analysis of the original waveform to extract timing, particle identification, and energy deposition information. Here we present the use of analytical functions based on sigmoids to model and fit such pulse shapes f ...
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Journal ArticlePhysical Review C · March 1, 2020
New measurements of the neutron-neutron quasifree scattering cross section in neutron-deuteron breakup at an incident neutron energy of 10.0 MeV are reported. The experiment setup was optimized to evaluate the technique for determining the integrated beam- ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · February 21, 2020
Gamma-Beams at the HIγS facility in the USA and anticipated at the ELI-NP facility, now constructed in Romania, present unique new opportunities to advance research in nuclear astrophysics; not the least of which is resolving open questions in oxygen forma ...
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ConferenceSpringer Proceedings in Physics · January 1, 2020
Experiments are underway at the Triangle Universities Nuclear Laboratory (TUNL) that provide data for evaluating calculations based on low-energy QCD theories, e.g., effective field theory formulations of two-nucleon and three-nucleon interactions, chiral- ...
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ConferenceEPJ Web of Conferences · 2020
Fission product yields (FPY) are one of the most fundamental quantities that can be measured for a fissioning nucleus and are important for basic and applied nuclear physics. Recent measurements using mono-energetic and pulsed neutron beams generat ...
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Journal ArticlePhysical Review C · July 19, 2019
Background: High-accuracy and self-consistent fission product yield (FPY) data are needed to advance microscopic/macroscopic descriptions of the nuclear fission process, to improve the predictive power of phenomenological models, and for applications in nu ...
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Journal ArticlePhysical Review C · November 30, 2018
This paper reports the results of the first measurements of the differential cross section of the Se80(γ,n)Se79 reaction with a linearly polarized gamma-ray (γ-ray) beam. The cross section was measured at three incident γ-ray beam energies: 15.6, 15.8, and ...
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ConferenceProceedings of Science · January 1, 2018
The main goal of few-nucleon research at the Triangle Universities Nuclear Laboratory (TUNL) is to perform high-precision measurements that contribute to advancing ab-initio calculations and testing nucleon-interaction models. The current focus is on the t ...
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Journal ArticleProgress in Particle and Nuclear Physics · May 1, 2017
Over the last decade, the Low-Energy Nuclear Physics (LENP) and Nuclear Astrophysics (NAP) communities have increasingly organized themselves in order to take a coherent approach to resolving the challenges they face. As a result, there is a high level of ...
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Journal ArticleNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · 2017Cite
ConferenceEPJ Web of Conferences · March 25, 2016
We provide an update on the development of an experiment at TUNL for determining the 1S0 neutron-neutron (nn) scattering length (ann) from differential cross-section measurements of three-body photodisintegration of the triton. The experiment will be condu ...
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ConferenceEPJ Web of Conferences · March 25, 2016
We are developing an experiment to measure the two and three-body (γ, p) differential cross sections (DCS) for 3H and 3He. These data will be used to determine the 1S0 nn scattering length (ann) and np scattering length (anp) respectively. This paper descr ...
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ConferenceEPJ Web of Conferences · March 25, 2016
The neutron-deuteron (nd) breakup reaction provides a rich environment for testing theoretical models of the neutron-neutron (nn) interaction. Current theoretical predictions based on rigorous ab-initio calculations agree well with most experimental data f ...
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ConferenceEPJ Web of Conferences · March 25, 2016
The central goal of few-nucleon research at the Triangle Universities Nuclear Laboratory (TUNL) is to perform measurements that contribute to advancing ab-initio calculations of nuclear structure and reactions. The program aims include evaluating theoretic ...
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ConferenceInternational Journal of Modern Physics: Conference Series · January 2016
Hadronic parity violation uses quark-quark weak interactions to probe nonperturbative strong interaction dynamics through two nonperturbative QCD scales: [Formula: see text] and the fine-tuned MeV scales of NN bound states in low energy nuclear ph ...
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Journal ArticlePhysical Review C - Nuclear Physics · June 5, 2015
Using dual-fission chambers each loaded with a thick (200-400-mg/cm2) actinide target of 235,238U or Pu239 and two thin (∼10-100-μg/cm2) reference foils of the same actinide, the cumulative yields of fission products ranging from Sr92 to Nd147 have been me ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · September 1, 2014
A program has been initiated to measure the energy dependence of selected high-yield fission products used in the analysis of nuclear test data. We present out initial work of neutron activation using a dual-fission chamber with quasi-monoenergetic neutron ...
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ConferenceProceedings of Science · June 18, 2014
The UVa group in collaboration with the TUNL group is currently building a frozen spin target system for the high intensity gamma-ray source (HIγS) at the Duke Free Electron Laser Laboratory (HIFROST). The heart of the system is a dilution refrigerator whi ...
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Journal ArticlePhysical Review Letters · May 27, 2014
The 12+→12+ superallowed mixed mirror decay of Ne19 to F19 is excellently suited for high precision studies of the weak interaction. However, there is some disagreement on the value of the half-life. In a new measurement we have determined this quantity to ...
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ConferencePhysical Review C - Nuclear Physics · May 12, 2014
We present measurements of n-d analyzing power, Ay(θ), at En=22.5 MeV. The experiment uses a shielded neutron source which produced polarized neutrons via the 2H(d - ,n - )3He reaction. It also uses a deuterated liquid-scintillator center detector and six ...
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Journal ArticlePhysical Review C - Nuclear Physics · May 21, 2013
Background: The most significant source of background in direct dark matter searches are neutrons that scatter elastically from nuclei in the detector's sensitive volume. Experimental data for the elastic scattering cross section of neutrons from argon and ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · January 1, 2013
The ability to detect the emissions of radioactive isotopes through radioactive decay (e.g. beta particles, x-rays and gamma-rays) has been used for over 80 years as a tracer method for studying natural phenomena. More recently a positron emitting radioiso ...
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Journal ArticleFew-Body Systems · January 1, 2013
In order to confirm or refute the present discrepancy between data and calculation for the neutron-neutron quasi-free scattering cross section in the neutron-deuteron breakup reaction, we describe a new experimental approach currently being pursued at TUNL ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · January 1, 2013
PhytoPET is a modular positron emission tomography (PET) system designed specifically for plant imaging. The PhytoPET design allows flexible arrangements of PET detectors based on individual standalone detector modules built from single Hamamatsu H8500 pos ...
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Journal ArticleNuclear Physics A · December 1, 2012
The first direct neutron-neutron scattering experiment using the YAGUAR pulsed reactor has yielded initial results. They show a unforeseen significant thermal neutron background as a result of radiation-induced desorption within the scattering chamber. The ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2012
We have developed a flash analog to digital (ADC) based read out system to be used for a Positron Emission Tomography (PET) system. The custom designed 16 channel 12-bit Ethernet-based flash ADC (EFADC-16) unit operates at 250 MHz/s/channel utilizing a gig ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2012
We have developed a positron emission tomography (PET) system designed specifically for plant imaging in Phytotron at Duke University. Initial evaluation of a PhytoPET system to image the biodistribution of the positron emitting tracer 11C in live plants i ...
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Journal ArticlePhysical Review C - Nuclear Physics · September 10, 2012
Background: The nucleon-nucleus dispersive optical model (DOM) has been successful in providing good fits to scattering data and in making valuable predictions for bound-state properties in single- and double-closed shell nuclei. However, the generalizabil ...
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Journal ArticlePhysical 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 ...
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Journal ArticleMed Phys · June 2012
PURPOSE: We have been developing a fast-neutron spectroscopic technique to quantitatively image the distribution of elements in the body using quasi-monochromatic neutron beams. Previously, we demonstrated the ability of the technique to quantify specific ...
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Journal ArticlePhysical Review C - Nuclear Physics · May 16, 2012
Cross-section measurements have been made at 16 and 19 MeV in two exit-channel configurations of neutron-deuteron breakup: the space star and coplanar star. In this kinematically complete measurement, the outgoing proton and one of the neutrons were detect ...
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Journal ArticlePhysical Review C - Nuclear Physics · April 3, 2012
Models of the r process are sensitive to the production rate of 9Be because, in explosive environments rich in neutrons, α(αn,γ) 9Be is the primary mechanism for bridging the stability gaps at A=5 and A=8. The α(αn,γ)9Be reaction represents a two-step proc ...
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Journal ArticlePhysical Review C - Nuclear Physics · April 2, 2012
Nuclear resonance fluorescence experiments were carried out at the High-Intensity γ-ray Source facility at Triangle Universities Nuclear Laboratory to characterize the low-energy dipole structure of 238U using 100% linearly polarized photon beams from 2.0 ...
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Journal ArticlePhysical Review C - Nuclear Physics · October 31, 2011
The 48Ca(γ,n) cross section was measured by using γ-ray beams of energies between 9.5 and 15.3 MeV generated at the Triangle Universities Nuclear Laboratory high-intensity γ-ray source. Prior to this experiment, no direct measurements had been made with γ- ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · August 11, 2011
A neutron counter designed for assay of radioactive materials has been adapted for beam experiments at TUNL. The cylindrical geometry and 60% maximum efficiency make it well suited for (γ,n) cross-section measurements near the neutron emission threshold. A ...
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Journal ArticlePhysical Review C - Nuclear Physics · June 15, 2011
Neutron elastic-scattering angular distributions were measured at beam energies of 11.9 and 16.9 MeV on Ca40,48 targets. These data plus other elastic-scattering measurements, total and reaction cross-sections measurements, (e,e′p) data, and single-particl ...
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Journal ArticlePhysical Review C - Nuclear Physics · April 28, 2011
Cross-section measurements for neutron-induced reactions on GaAs have been carried out at twelve different neutron energies from 7.5 to 15 MeV using the activation technique. The monoenergetic neutron beams were produced via the H2(d,n)He3 reaction. GaAs s ...
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Journal ArticlePhysical Review C - Nuclear Physics · April 21, 2011
Gamma-ray transitions in U235 were measured using the (γ, γ') reaction below 3 MeV. The nuclear-resonance-fluorescence experiment was carried out at the High-Intensity γ-ray Source facility using nearly monoenergetic and circularly polarized photon beams. ...
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Journal ArticlePhysical Review C - Nuclear Physics · March 25, 2011
Properties of low-energy dipole states in Th232 have been investigated with the nuclear resonance fluorescence technique. The present work used monoenergetic γ-ray beams at energies of 2-4 MeV from the high-intensity γ-ray source at Triangle Universities N ...
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Journal ArticleJournal of Physics: Conference Series · January 1, 2011
Cross section measurements for the neutron induced reactions on GaAs have been carried out at ten different neutron energies from 7.5 to 15 MeV, using the activation technique. The monoenergetic neutron beams were produced via the 2H(d,n)3He reaction, know ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · January 1, 2011
The development and initial evaluation of a high-resolution positron emission tomography (PET) system to image the biodistribution of positron emitting tracers in live plants is underway. The positron emitting 11CO2 tracer is used in plant biology research ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2010
The 11 CO2 tracer is used to facilitate plant biology research towards optimization of plant productivity, biofuel development and carbon sequestration in biomass. Positron emission tomography (PET) imaging has been used to study carbon transport in live p ...
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Journal ArticlePhysical Review C - Nuclear Physics · November 30, 2010
The photodisintegration cross section of the radioactive nucleus Am 241 has been obtained using activation techniques and monoenergetic γ-ray beams from the HIγS facility. The induced activity of Am 240 produced via the Am241(γ,n) reaction was measured in ...
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Journal ArticlePhys Med Biol · September 7, 2010
The objective of this paper is threefold: (1) to establish sensitivity of XRQA and EBT radiochromic films to fast neutron exposure; (2) to develop a film response to radiation dose calibration curve and (3) to investigate a two-dimensional (2D) film dosime ...
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Journal ArticlePhysical Review C - Nuclear Physics · February 23, 2010
Measurements of neutron-deuteron (n-d) analyzing power Ay(θ) at En=19.0 MeV are reported at 16 angles from θc.m.=46.7 to 152.0°. The objective of the experiment is to better characterize the discrepancies between n-d data and the predictions of three-nucle ...
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ConferenceMedical Physics · January 1, 2010
In‐vivo quantitative measurement of iron has been the focus of several studies related to iron disorders in the human body. Techniques such as SQUID and MRI have been used to detect liver iron stores in patients afflicted with hemochromatosis and thalassem ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2009
There are opportunities for the development of new tools to advance plant biology research through the use of radionuclides. Thomas Jefferson National Accelerator Facility, Duke University, West Virginia University and the University of Maryland are collab ...
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Journal ArticlePhysical Review C - Nuclear Physics · August 6, 2009
Precision measurements of U238(n,n'γ) and U238(n,2nγ) partial cross sections have been performed at Triangle Universities Nuclear Laboratory (TUNL) to improve crucial data needed for testing nuclear reaction models in the actinide mass region. A pulsed and ...
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Journal ArticleAIP Conference Proceedings · May 14, 2009
A new experiment was proposed in 2002 to perixirm the first direct measurement of neutron-neutron scattering on the powerful pulsed reactor YAGUAR located at Snezhinsk, Ural region, Russia. Extensive efforts were made to model the background conditions and ...
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Journal ArticleAIP Conference Proceedings · May 5, 2009
The photodisintegration cross section of radioactive 241Am has been obtained for the first time using monoenergetic γ-ray beams from the HIγS facility. The induced activity of240Am produced via the 241Am(γ,n) reaction in the γ-ray energy range from 9.5 to ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · February 11, 2009
The methods employed and the results obtained from measurements and calculations of the detection efficiency for the neutron detectors used at Triangle Universities Nuclear Laboratory (TUNL) in the simultaneous determination of the 1S0 neutron-neutron and ...
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Journal ArticlePhysical 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 ...
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ConferenceMedical Physics · January 1, 2009
We developed a mouse dosimetry model for neutron beam, and compared the calculated and simulated neutron doses for a water target (mouse) exposed to a 10 MeV neutron beam. We also estimated the longitudinal neutron dose profile for the water target. A wate ...
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ConferenceMedical Physics · January 1, 2009
The purpose of this paper is to estimate neutron doses using radiochromic XRQA films. Five radiochromic films, placed at varying distances from the neutron source and a water bottle, were exposed to a flux of 10 MeV neutrons produced via the d(d, n)He reac ...
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Journal ArticleNuclear Science and Engineering · January 1, 2009
Measurements are reported on the yield of neutrons from protons in the energy range from 7 to 17 MeV striking a stopping-length target of deuterium gas. This combination of beam and target is being investigated as an alternative to spallation for accelerat ...
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Journal ArticleHFSP journal · August 2008
Short-lived positron-emitting radiotracer techniques provide time-dependent data that are critical for developing models of metabolite transport and resource distribution in plants and their microenvironments. Until recently these techniques were applied t ...
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Journal ArticlePhysical Review C - Nuclear Physics · May 27, 2008
New data were taken at the Triangle Universities Nuclear Laboratory to investigate the plausibility of using low energy deuterons and the B10(d,n)C11 reaction as a portable source of 6.3 MeV neutrons. Analysis of the data at and below incident deuteron ene ...
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Journal ArticlePhysical Review C - Nuclear Physics · May 27, 2008
The (n,2n) cross section of the radioactive isotope Am241 (T1/2=432.6 y) has been measured in the incident neutron energy range from 7.6 to 14.5 MeV in steps of a few MeV using the activation technique. Monoenergetic neutron beams were produced via the H2( ...
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Journal ArticlePhysical Review C - Nuclear Physics · May 23, 2008
We have determined a value for the 1S0 neutron-neutron scattering length (ann) from high-precision measurements of time-of-flight spectra of neutrons from the H2(π-,nγ)n capture reaction. The measurements were done at the Los Alamos Meson Physics Facility ...
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Journal ArticlePhys Med Biol · May 7, 2008
This paper describes the implementation of neutron-stimulated emission computed tomography (NSECT) for non-invasive imaging and reconstruction of a multi-element phantom. The experimental apparatus and process for acquisition of multi-spectral projection d ...
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Journal ArticlePhysics in medicine and biology · May 2008
Iron overload disorders have been the focus of several quantification studies involving non-invasive imaging modalities. Neutron spectroscopic techniques have demonstrated great potential in detecting iron concentrations within biological tissue. We are de ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · February 21, 2008
We present the most accurate and complete data set for the analyzing power Ay (θ) in neutron-proton scattering. The experimental data were corrected for the effects of multiple scattering, both in the center detector and in the neutron detectors. The final ...
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Journal ArticleIEEE Transactions on Nuclear Science · January 1, 2008
Neutron stimulated emission computed tomography (NSECT) is being developed as a non-invasive spectroscopic imaging technique to determine element concentrations in the human body. NSECT uses a beam of fast neutrons that scatter inelastically from atomic nu ...
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Journal ArticleProceedings of the IEEE Particle Accelerator Conference · December 1, 2007
A booster synchrotron (Duke booster) has been built and recently commissioned at Duke University Free Electron Laser Laboratory (DFELL) as part of the High Intensity Gamma-ray Source (HIGS) facility upgrade. HIGS is collaboration between the DFELL and Tria ...
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Journal ArticleProgress in Biomedical Optics and Imaging - Proceedings of SPIE · October 15, 2007
Several studies have shown that the concentration of certain elements may be a disease indicator. We are developing a spectroscopic imaging technique, Neutron Stimulated Emission Computed Tomography (NSECT), to non-invasively measure and image elemental co ...
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Journal ArticleIEEE Transactions on Nuclear Science · October 1, 2007
A new spectroscopic imaging technique, Neutron Stimulated Emission Computed Tomography (NSECT), is currently being developed to non-invasively and non-destructively measure and image elemental concentrations within the body. NSECT has potential for use in ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms · August 1, 2007
In support of the Stewardship Science Academic Alliances initiative, an experimental program has been developed at Triangle Universities Nuclear Laboratory (TUNL) to measure (n,xn) cross-sections with both in-beam and activation techniques with the goal of ...
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Journal ArticleAIP Conference Proceedings · April 4, 2007
The High-Intensity Gamma-ray Source utilizing intra-cavity back-scattering of free electron laser photons from relativistic electrons allows one to produce a unique beam of high-flux gamma rays with 100% polarization and selectable energy and energy resolu ...
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Journal ArticleChiral Dynamics 2006 - Proceedings of the 5th International Workshop on Chiral Dynamics, Theory and Experiment, CD 2006 · January 1, 2007
This article provides a brief summary of the values for the 1S0 neutron-neutron scattering length obtained from neutron-deuteron breakup cross-section measurements. The results of recent kinematically incomplete and complete experiments are reported, and a ...
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ConferenceProceedings of Science · January 1, 2007
High sensitivity studies of E1 andM1 excitations fromthe 138Ba(γ,γ') reaction at energies close to the neutron emission threshold have been performed. The electric dipole character of the "pygmy" mode was experimentally verified for excitations from 5.5-8. ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms · January 1, 2007
Neutron stimulated emission computed tomography (NSECT) is an imaging technique that provides an in-vivo tomographic spectroscopic image of the distribution of elements in a body. To achieve this, a neutron beam illuminates the body. Nuclei in the body alo ...
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Journal ArticlePhys Med Biol · July 21, 2006
Neutron stimulated emission computed tomography (NSECT) is presented as a new technique for in vivo tomographic spectroscopic imaging. A full implementation of NSECT is intended to provide an elemental spectrum of the body or part of the body being interro ...
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Journal ArticleProgress in Biomedical Optics and Imaging - Proceedings of SPIE · July 3, 2006
Certain elements (such as Fe, Cu, Zn, etc.) are vital to the body and an imbalance of such elements can either be a symptom or cause of certain pathologies. Neutron Stimulated Emission Computed Tomography (NSECT) is a spectroscopic imaging technique whereb ...
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Journal ArticleProgress in Biomedical Optics and Imaging - Proceedings of SPIE · June 30, 2006
Neutron Stimulated Emission Computed Tomography (NSECT) was evaluated as a potential technique for breast cancer diagnosis. NSECT can form a 3D tomographic image with an elemental (isotopic) spectrum provided at each reconstructed voxel. The target is illu ...
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Journal ArticleAIP Conference Proceedings · March 13, 2006
The nuclear resonance fluorescence experiments have been performed at the High Intensity Gamma Source (HIγS) on 138Ba nuclei using four 60% efficient HPGe detectors. Excitation energies, spin, parities, and decay branching ratios were measured for the low- ...
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Journal ArticleNuclear Physics A · January 9, 2006
Recoil polarimetry was used to extract the ratio of the proton electromagnetic form factors, μp GEp/ GMp = 0.878 ± 0.064(stat) ± 0.012(sys), at Q2 = 1.13 (GeV/c)2 from the reaction 1H(e, ep). This was an ancillary measurement in which the proton polarizati ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2006
The absolute astrophysical S factor and cross section for the Li7(d,n0)Be8 and Li7(d,n1)Be8 reactions have been determined using deuteron beams with energies between 45 and 80 keV. The slope of the S factor is consistent with zero in the n0 case but is sli ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2006
We report on results of a kinematically complete neutron-deuteron breakup experiment performed at Triangle Universities Nuclear Laboratory using an En=13 MeV incident neutron beam. The 1S0 neutron-neutron scattering length ann has been determined for four ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · January 1, 2006
Neutron stimulated emission computed tomography (NSECT) is being developed as a non-invasive technique to measure element concentration in in-vivo tissue at molecular levels. We have developed a system that performs this task using an incident neutron beam ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · January 1, 2006
Neutron Stimulated Emission Computed Tomography (NSECT) is being developed for in vivo measurement of the concentration and location of biologically relevant elements. NSECT is a spectroscopic imaging technique whereby the body is illuminated via high-ener ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2006
The polarization observables have been determined for the Li7(d→,n0)Be8 and Li7(d→,n1)Be8 reactions at beam energies between 80 and 160 keV. A Transition Matrix Element (TME) analysis revealed unique, dominant p-wave solutions for both neutron channels. Th ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms · December 1, 2005
The Direct Investigation of ann Association (DIANNA) is finalizing the design of a direct measurement of the nn-scattering length to be performed at the YAGUAR reactor in Snezhinsk, Russia. Extensive modeling of the neutron field, nn-scattering kinematics, ...
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Journal ArticleProceedings of the IEEE Particle Accelerator Conference · December 1, 2005
The Duke FEL lab operates a unique UV/VUV storage ring FEL and an FEL driven nearly monochromatic, highly polarized, high intensity Compton gamma-ray source. The Duke storage ring light source is undergoing several phases of upgrade in order to significant ...
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Journal ArticleIEEE Nuclear Science Symposium Conference Record · December 1, 2005
Neutron spectroscopy is being developed as a noninvasive tool to measure element concentration in the body at molecular levels. We are developing a neutron stimulated emission computed tomography (NSECT) system to identify element concentrations in tissue, ...
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Journal ArticlePhysical Review C - Nuclear Physics · June 1, 2005
This paper was published online on 20 May 2005 without several of the authors' corrections incorporated. Equation (13) has been replaced. The captions of Figs. 16-18 have also been replaced. Typographical errors on pages 4, 6, 14, 15, 18, 19, 22, and 24 ha ...
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Journal ArticleNucl. Instr. Methods B. · 2005
The high intensity γ-ray source (HIγS)
utilizes intra-cavity backscattering of free
electron laser photons from the Duke electron
storage ring to produce a unique
monoenergetic beam of high-flux γ-rays with
high polarization and selectable e ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2005
Cross-section measurements of seven exit-channel configurations in the neutron-deuteron breakup at 13.0 MeV are reported and compared to rigorous calculations. Our data are consistent with those of previous measurements in four of six configurations. The p ...
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Journal ArticleBrazilian Journal of Physics · January 1, 2005
A direct measurement of nn-scattering by colliding free neutrons has never been performed. Indirect measurements continue to provide inconsistent results, leaving the issue of charge symmetry in the nuclear force unresolved. At present the Russian pulsed r ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2005
The analyzing power Ay(θ) for neutron elastic scattering from C12 has been measured for 33 neutron energies between En=2.2 and 8.5 MeV in the angular range from 25° to 145° in the laboratory system. The primary motivation for these measurements is the need ...
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Journal ArticleJournal of Physics G: Nuclear and Particle Physics · December 1, 2004
Data for σ(θ) and Ay(θ) previously obtained at the Triangle Universities Nuclear Laboratory for 120Sn(n, n) are combined with other measurements of σ(θ) and Ay(θ) to create an elastic-scattering database from 9.9 to 24 MeV. In addition, relatively recent h ...
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Journal ArticleJournal of Physics G: Nuclear and Particle Physics · September 1, 2004
A direct neutron-neutron scattering length, ann, measurement with the goal of 3% accuracy (0.5 fm) is under preparation at the aperiodic pulsed reactor YAGUAR. A direct measurement of ann will not only help resolve conflicting results of ann by indirect me ...
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Journal ArticleProceedings of SPIE - The International Society for Optical Engineering · July 5, 2004
Here we report on the development of a new molecular imaging technique using inelastic scattering of fast neutrons. Earlier studies demonstrated a significant difference in trace element concentrations between benign and malignant tissue for several cancer ...
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Journal ArticlePhysical Review C - Nuclear Physics · 2004
The physics program in Hall A at Jefferson Lab commenced in the summer of 1997 with a detailed investigation of the 16O(e,e′p) reaction in quasielastic. constant (q,ω) kinematics at Q2≈0.8 (GeV/c)2, q ≈ 1 GeV/c, and ω≈445 MeV. Use of a self-calibrating, se ...
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Journal ArticleEuropean Physical Journal A · October 1, 2003
The ratio Gem/Gmn of the electric to the magnetic form factor of the neutron has been measured by analyzing the polarization of the recoiling neutron in quasi-elastic scattering of longitudinally polarized electrons from deuterium at the Q2 values of 0.45, ...
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Journal ArticlePhysical review letters · September 2003
We report new measurements of the ratio of the electric form factor to the magnetic form factor of the neutron, G(n)(E)/G(n)(M), obtained via recoil polarimetry from the quasielastic 2H(e-->,e(')n-->)1H reaction at Q2 values of 0.45, 1.13, and 1.45 (GeV/c) ...
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ConferenceAIP Conference Proceedings · August 26, 2003
The ultra-high sensitivity of the 1S0 nucleon-nucleon (NN) scattering length to the strength of the nuclear potential makes it a central parameter for quantifying charge symmetry breaking in the strong nuclear force. Of the three 1S0 NN scattering lengths, ...
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ConferenceAIP Conference Proceedings · August 26, 2003
In order to resolve long-standing discrepancies in indirect measurements of the neutron-neutron scattering length ann and contribute to solving the problem of the charge symmetry of the nuclear force, the collaboration DIANNA (Direct Investigation of ann A ...
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Journal ArticleEuropean Physical Journal A · June 1, 2003
The ratio of the electric to the magnetic form factor of the neutron, g ≡ GEn/GMn, was measured via recoil polarimetry (R.G. Arnold, C.E. Carlson, F. Gross, Phys. Rev. C 23, 363 (1981)) from the quasielastic 2H(e→, e′ n→) 1H reaction at three values of Q2 ...
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Journal ArticleModern Physics Letters A · February 28, 2003
New results for the neutron-deuteron analyzing power Ay (θ) at En = 1.2 and 1.9 MeV and their comparison to proton-deuteron data reveal a sizeable and unexpected difference which increases with decreasing center-of-mass energy. This finding calls for the t ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · January 16, 2003
New results for the neutron-deuteron analyzing power Ay(θ) at En = 1.2 and 1.9 MeV and their comparison to proton-deuteron data reveal a sizeable and unexpected difference which increases with decreasing center-of-mass energy. This finding calls for the th ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2003
The influence of the magnetic moment interaction of nucleons on nucleon-deuteron elastic scattering and breakup cross sections and on elastic scattering polarization observables has been studied. Among the numerous elastic scattering observables only the v ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2003
Differential cross sections [Formula Presented] and analyzing powers [Formula Presented] have been measured for neutron scattering from [Formula Presented] and [Formula Presented] at [Formula Presented] at the Triangle Universities Nuclear Laboratory using ...
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Journal ArticlePhysical 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 ...
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Journal ArticlePhysical Review C - Nuclear Physics · 2003
Differential cross sections σ(θ) and analyzing powers A y(θ) have been measured for neutron scattering from 27Al and 59Co at 15 MeV at the Triangle Universities Nuclear Laboratory using standard time-of-flight techniques. In addition, σ(θ) was measured for ...
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Journal ArticlePhysical Review Letters · 2003
The measurements of GEn/GMn obtained via recoil polarimetry from the quasielastic 2H(e→,e′n→)1H reaction at three central Q2 values of 0.45, 1.15 and 1.47 (GeV/c)2 were reported. A beam of longitudinally polarized electrons was found to scatter quasielasti ...
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Journal ArticlePhysical Review C - Nuclear Physics · 2003
The influence of the magnetic moment interaction of nucleons on nucleon-deuteron elastic scattering and breakup cross sections and on elastic scattering polarization observables has been studied. Among the numerous elastic scattering observables only the v ...
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Journal ArticleInternational Meeting on Nuclear Applications of Accelerator Technology: Accelerator Application in a Nuclear Renaissance · January 1, 2003
Modern high power accelerators and reactors provide the possibility of a direct measurement of neutron-neutron scattering. This experiment addresses the fundamental problem of charge symmetry in the nuclear force by comparing the proton-proton, pp, and neu ...
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Journal ArticlePhysical 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 ...
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Journal ArticlePhysical 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, between 0.1 and 0.6 (GeV/c)2. AT′ is sensitive ...
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Journal ArticleJournal of Physics G: Nuclear and Particle Physics · October 1, 2002
We propose to perform the first measurement of the neutron-neutron scattering cross section in the through-channel of the pulsed aperiodic reactor YAGUAR (Snezhinsk, Russia). Such a measurement directly determines the neutron-neutron scattering length, and ...
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Journal ArticlePhysical 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 electromagnetic form ...
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Journal ArticlePhysical 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 ...
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Journal ArticleNuclear Physics A · June 18, 2001
The results of recent nucleon-deuteron breakup experiments are reviewed, and a comparative evaluation of the data is presented. Discrepancies between data from different experiments are identified, and modest attempts to resolve the discrepancies are made. ...
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Journal ArticlePhysical 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 ...
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Journal ArticlePhysical review letters · February 2000
The ratio of the proton's elastic electromagnetic form factors, G(E(p))/G(M(p)), was obtained by measuring P(t) and P(l), the transverse and the longitudinal recoil proton polarization, respectively. For elastic e-->p-->ep-->, G(E(p))/G(M(p)) is proportion ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2000
The first measurement of the 2H(γ→,n)p analyzing power near threshold has been performed using the High-Intensity Gamma-ray Source (HIGS) at the Duke Free-Electron Laser Laboratory. A 3.58 MeV γ-ray beam having an energy resolution of 2.5% and 100% linear ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2000
The first measurement of the [Formula Presented] analyzing power near threshold has been performed using the High-Intensity Gamma-ray Source (HIGS) at the Duke Free-Electron Laser Laboratory. A 3.58 MeV [Formula Presented]-ray beam having an energy resolut ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 2000
The first [Formula Presented] polarization transfer measurements on a nucleus heavier than deuterium have been carried out at Jefferson Laboratory. Transverse and longitudinal components of the polarization of protons ejected in the reaction [Formula Prese ...
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Journal ArticlePhysical Review Letters · January 1, 1999
The present paper reports high-accuracy cross-section data for the 2H(n, nnp) reaction in the neutron-proton (np) and neutron-neutron (nn) final-state-interaction (FSI) regions at an incident mean neutron energy of 13.0 MeV. These data were analyzed with r ...
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Journal ArticlePhysical 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 Jefferson Laboratory. The data are comp ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · December 24, 1998
We report a high-precision determination of the 1S0 neutron-neutron scattering length (ann) using the 2H(π-,ny)n reaction. The value obtained in the present work is -18.50 ± 0.05 (statistical) ± 0.44 (systematic) ± 0.30 (theoretical) fm, which is consisten ...
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Journal ArticleIEEE Transactions on Nuclear Science · December 1, 1998
We measured the analyzing power and the efficiency of a new neutron polarimeter that was designed to measure G£, the neutron electric form factor. The polarimeter calibration was performed as experiment E377 at the Indiana University Cyclotron Facility (IU ...
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Journal ArticleNuclear Instruments \& Methods In Physics Research Section A-accelerators Spectrometers Detectors And Associated Equipment · April 1998Cite
Journal ArticleNuclear Physics A · March 2, 1998
The neutron-neutron and neutron-proton 1So scattering lengths ann and anp, respectively, were determined simultaneously from the neutron-deuteron breakup reaction. Their comparison with the recommended values obtained from "two-body" reactions gives a meas ...
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Journal ArticleNuclear Physics A · March 2, 1998
Cross-section measurements of six exit-channel configurations in nd breakup at 13.0 MeV are reported and compared to rigorous calculations. Except for the coplanar-star configuration, our data are consistent with previous data. The present data for all con ...
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Journal ArticleNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · September 11, 1997
The absolute efficiency of an NE213 liquid scintillator of 12.7 cm diameter and 5.08 cm thickness was measured in the neutron energy range 2.5-16 MeV using the 2H(d, n)3He reaction as a source of monoenergetic neutrons. The efficiencies were measured at th ...
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Journal ArticlePhysical Review C - Nuclear Physics · January 1, 1997
We report the most extensive set of vector [Formula Presented] and tensor [Formula Presented] and [Formula Presented] analyzing-power data for the [Formula Presented] reaction. Two-particle coincidence data have been measured for six deuteron-proton, three ...
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Journal ArticlePhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics · November 14, 1996
Cross-section measurements of a collinear configuration, the space-star and the coplanar-star configurations in nd breakup at En = 13.0 MeV are reported. The present measurements for the collinear configuration are in good agreement with pd and nd data. Ou ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, B · May 5, 1995
Results of our recent kinematically complete cross-section measurements of the space-star and coplanar-star configurations in n-d breakup at 13.0 MeV are reported. The experimental setup and details of the analysis are described. The new data for the space ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, A · April 21, 1995
A newly constructed source of polarized H± and D± ions is described. Atomic H or D beams from a dissociator with a cooled nozzle enter a system of two sextupole magnets and several radio-frequency transitions where they are focused and polarized. They ente ...
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Journal ArticleFew-Body Systems · September 1, 1994
High-accuracy differential cross-section data for neutron-deuteron elastic scattering at centre-of-mass backward angles in the range from 140° to 178° have been measured to accuracies better than ±3% for incident neutron energies of 8.0, 10.0, and 14.0 MeV ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, A · January 1, 1994
The response function of a 12.5 cm diameter NE213 scintillator detector has been measured over neutron energies ranging from 4.9 to 16.6 MeV. Beams of monoenergetic neutrons were produced using the 2H(d, n)3He reaction. The response function is about 12% l ...
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Journal ArticleJournal of Physics G: Nuclear and Particle Physics · December 1, 1993
The differential cross section sigma ( theta ) for neutron elastic scattering from 12C and for inelastic scattering from the 4.44 MeV state was measured at 15.57, 16.75 and 17.29 MeV. The sigma ( theta ) data, together with published analysing power Ay( th ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, B · June 2, 1993
The dispersive optical model (DOM) provides a natural connection between the shell model potential for bound states and the optical model for nucleon scattering at positive energies. At TUNL we have developed DOMs for neutron scattering for ten nuclei betw ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, B · 1993
The dispersive optical model (DOM) provides a natural connection between the shell model potential for bound states and the optical model for nucleon scattering at positive energies. At TUNL we have developed DOMs for neutron scattering for ten nuclei betw ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, B · May 1, 1991
In this paper we review the results of a series of high-accuracy measurements on the neutron-deuteron (n-d) scattering system at incident neutron energies below 20 MeV. These measurements were designed to: 1) provide data of sufficient accuracy to be used ...
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Journal ArticlePhysics Letters B · March 28, 1991
Data for the analyzing power Ay(θ) for the elastic scattering of neutrons from deuterons have been measured at 5.0, 6.5 and 8.5 MeV to an accuracy of ±0.0035. Surprisingly large differences have been observed at these low energies between the data and rigo ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, A · May 10, 1990
Experimental methods to measure the vector analyzing powers over a broad range of kinematic configurations in the n-d breakup reaction have been developed at TUNL. These techniques employ the polarized beam facilities at TUNL and use the 2H(d, n)3He reacti ...
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Journal ArticleNuclear Inst. and Methods in Physics Research, B · April 2, 1989
Accurate polarization data obtained with neutrons below 20 MeV in the A ≤ 3 systems provide important new information on details of the nucleon-nucleon (NN) interaction. The two-nucleon and three-nucleon data favor the Paris potential over the new Bonn (OB ...
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Journal ArticleJournal of Physics G: Nuclear Physics · December 1, 1988
The analysing power Ay( theta ) for 12C(n,n) 12C elastic scattering and for inelastic scattering to the first excited state (Jpi=2+, Q=-4.44 MeV) of 12C was measured at 18.2 MeV. A pulsed polarised neutron beam was produced via the 2H(d,n)3He polarisation ...
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Journal ArticleFew-Body Systems · March 1, 1987
High-accuracy analyzing-power Ay(θ) data for n-d elastic scattering at 12 MeV have been measured using the polarized-neutron facilities at the Triangle Universities Nuclear Laboratory (TUNL). The present data have been combined with our previous n-d measur ...
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Journal ArticleNuclear Physics, Section A · May 13, 1985
Differential cross sections for neutron scattering from 58Ni and 60Ni to the ground state and first excited state have been measured at 8, 10, 12 and 14 MeV. In addition, analyzing powers were measured for scattering to the same states for 58Ni at 10 and 1 ...
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Journal ArticleIEEE Transactions on Nuclear Science · January 1, 1983
Scattering experiments conducted with beams of polarized neutrons give special information about the spin sensitive part of the neutron-nucleus interaction. Carefully controlled measurements of the analyzing power A(θ) for the scattering of polarized neutr ...
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Journal ArticlePhysical Review C · January 1, 1983
Data for the analyzing power Ay() for the elastic scattering of neutrons from deuterons have been measured at 14.1 MeV for the range from 30°to 153°(c.m.) to accuracies between 0.003 and 0.006. The results are compared to previous n-d data at 14 MeV and ar ...
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Journal ArticleNuclear Instruments and Methods · April 15, 1982
A circuit capable of modulating the energy of a beam oor use with a three-stage bunching system has been designed and tested. This circuit charges up the anode of a duoplasmatron ion source through a resistor and discharges it through high power FETs at re ...
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Journal ArticleNuclear Science and Engineering · January 1, 1982
Fast neutron scattering cross sections have been measured for **1**3C. Angular distributions for elastic scattering over an angular range from 20 to 155 deg are presented for incident neutron energies of 9. 97, 11. 96, 13. 94, 15. 94, and 17. 92 Mev. Inela ...
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Journal ArticlePhysical Review Letters · January 1, 1982
The analyzing power Ay() for scattering of neutrons from deuterons at 10 MeV for 30°to 145°(c.m.) was measured to an accuracy better than 0.005. The results are compared to published p-d data at 10 MeV, and convincing differences are noted for the first ti ...
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Journal ArticlePhysical Review C · January 1, 1982
Accurate neutron analyzing powers have been obtained using a new pulsed polarized neutron facility. Data are presented for elastic scattering of 14-MeV neutrons from Ca40, Fe54, Cu65, Sn120, and Pb208 between 18°and 36°. Our data exhibit no evidence for th ...
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Journal ArticlePhysical Review C · January 1, 1982
Analyzing powers Ay() for inelastic scattering of 10-MeV neutrons to the first excited states of Fe54, Fe56, Ni58, Ni60, Sn120, and Pb208 have been measured at a few selected angles. These data were analyzed using a coupled channels code in which the full ...
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Journal ArticleIEEE Transactions on Nuclear Science · 1982
Scattering experiments conducted with beams of polarized neutrons give special information about the spin sensitive part of the neutron-nucleus interaction. Carefully controlled measurements of the analyzing power for the scattering of polarized neutron be ...
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