Scholars@Duke
Anton P. Tonchev

Anton P. Tonchev

Adjunct Professor in the Department of Physics
Physics
anton.tonchev@duke.edu
Box 90305, Durham, NC 27708-0305
107 Physics, Durham, NC 27708

Selected Publications

Measurement of magnetic dipole strength in 40Ar between 9.3 and 10.3 MeV excitation energy and impact on neutral current neutrino interaction

Journal Article Physical Review C · November 24, 2025 The magnetic dipole strength B(M1↑) of 40Ar was measured in the excitation energy range between 9.3 and 10.3 MeV. The nuclear resonance fluorescence technique was used with monoenergetic, linearly polarized incident photon beams. The new data in ... Full text Cite

Energy dependence of chain fission product yields from neutron-induced fission of 235U, 238U, and 239Pu

Journal Article Nuclear Data Sheets · June 1, 2025 The lack of completeness and systematic studies of cumulative fission product yield (FPY) from the three major actinides of 235U, 238U, and 239Pu, over a broad energy range, was the primary motivation for the LLNL-LANL-TUNL ... Full text Cite

Precise measurements of the γ -ray intensities following the β decay of Ce 144 and Nd 147

Journal Article Physical Review C · August 1, 2024 For many fission products, the γ rays emitted following β decay provide an easily detectable signature that can be used to identify their quantities and distributions in a sample. As a result, γ-ray spectroscopy is often exploited to study fission-product ... Full text Cite

Characterization of 235U, 238U and 239Pu fission ionization chamber foils by α and γ-ray spectrometry

Journal Article Nuclear 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 coun ... Full text Cite

Energy dependence of fission product yields in the second-chance fission region

Journal Article Physical 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). ... Full text Cite

Testing shell-model interactions at high excitation energy and low spin: Nuclear resonance fluorescence in Ge 74

Journal Article Physical Review C · August 1, 2023 With their complex low-spin structure, the germanium isotopes have accrued a large number of experimental data which challenge nuclear models. The structure of the Ge74 isotope is investigated here with nuclear resonance fluorescence as part of an extensiv ... Full text Cite

Cross section for inelastic neutron scattering from 193Ir at 6 MeV.

Journal Article Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine · May 2023 Two samples, one of natural iridium and the other of enriched 193Ir, were irradiated with a monoenergetic neutron beam of energy 6.0 MeV at the Triangle Universities Nuclear Laboratory. The product of the 193Ir [Formula: see text] Ir ... Full text Cite

Fission product yields from the U 238 (n,f) reaction at En=4.6 MeV

Journal Article Physical 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 ... Full text Cite

Microscopic calculation of fission product yields for odd-mass nuclei

Journal Article Physical Review C · April 1, 2023 Fission data are essential inputs to reaction networks involved in nucleosynthesis simulations and nuclear forensics. In such applications as well as in the description of multichance fission, the characteristics of fission for odd-mass nuclei are just as ... Full text Cite

Erratum: Monoenergetic photon-induced fission cross-section ratio measurements for U 235, U 238, and Pu 239 from 9.0 to 17.0 MeV (Physical Review C (2018) 98 (014608) DOI: 10.1103/PhysRevC.98.014608)

Journal Article Physical 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 ... Full text Cite

Energy-Dependent Fission-Product Yields in the Region of Second-Chance Fission

Conference 16th 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 ... Full text Cite

Neutral-current neutrino cross section and expected supernova signals for 40Ar from a three-fold increase in the magnetic dipole strength

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 10, 2022 In view of the great interest in liquid argon neutrino detectors, the 40Ar(γ,γ′)40Ar reaction was revisited to guide a calculation of the neutral current neutrino cross section at supernova energies. Using the nuclear reson ... Full text Cite

Development of a rapid-transit system for precision nuclear physics measurements

Journal Article Nuclear 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 ... 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

Structure of high-lying levels populated in the 96Y →96Zr β decay

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · September 10, 2021 The nature of the high-lying final levels of the 96Ygs β decay, one of the three most important contributors to the high-energy reactor antineutrino spectrum, has been investigated in high-resolution γ-ray spectroscopy following the β ... Full text Cite

New approach to precisely measure γ-ray intensities for long-lived fission products, with results for the decay of 95Zr

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · June 1, 2021 For many fission products, the γ rays emitted following β decay provide an easily-detectable signature that can be used to identify their quantities and distributions in a sample. As a result, γ-ray spectroscopy is often exploited to study fission-product ... Full text Cite

Measurements of Short-Lived Isomers from Photofission as a Method of Active Interrogation for Special Nuclear Materials

Journal Article Physical 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 ... Full text Cite

Fission product yield measurements using monoenergetic photon beams

Journal Article Physical 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 ... Full text Cite

The surprisingly large neutron capture cross-section of 88Zr.

Journal Article Nature · January 2019 The probability that a nucleus will absorb a neutron-the neutron capture cross-section-is important to many areas of nuclear science, including stellar nucleosynthesis, reactor performance, nuclear medicine and defence applications. Although neutron captur ... Full text Cite

Improved Cumulative Fission Yield Measurements with Fission Spectrum Neutrons on 235U

Journal Article Nuclear Data Sheets · January 1, 2019 Two isotopically-characterized targets of high-purity (99.84±0.03%) 235U-oxide and a neutron dosimetry package were exposed to a pulsed neutron irradiation using the Godiva critical assembly at the National Criticality Experiments Research Cente ... Full text Cite

Measurement of the in 115 (γ,γ′) in 115m inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams MEASUREMENT of the in 115 (γ, ... W. TORNOW et al.

Journal Article Physical Review C · December 6, 2018 For the first time the excitation cross section of In115 to its first excited state at 336.24 keV has been measured with monoenergetic photon beams at 15 energies between 1.8 and 3.7 MeV. The measurements were performed at the High-Intensity Gamma-ray Sour ... Full text Cite

FIER: Software for analytical modeling of delayed gamma-ray spectra

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · May 21, 2018 A new software package, the Fission Induced Electromagnetic Response (FIER) code, has been developed to analytically predict delayed γ-ray spectra following fission. FIER uses evaluated nuclear data and solutions to the Bateman equations to calculate the t ... Full text Cite

Astrophysical relevance of the low-energy dipole strength of 206Pb

Conference EPJ Web of Conferences · May 16, 2018 The dipole strength of 206Pb was studied below the neutron separation energy using photon scattering experiments at the HIGS facility. Utilizing the technique of nuclear resonance fluorescence with 100% linearly-polarized photon beams, the spins ... Full text Cite

Pygmy and core polarization dipole modes in 206Pb: Connecting nuclear structure to stellar nucleosynthesis

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · October 10, 2017 A high-resolution study of the electromagnetic response of 206Pb below the neutron separation energy is performed using a γ→,γ′) experiment at the HIγ→S facility. Nuclear resonance fluorescence with 100% linearly polarized photon beam ... Full text Cite

Capture cross sections on unstable nuclei

Conference EPJ Web of Conferences · September 13, 2017 Accurate neutron-capture cross sections on unstable nuclei near the line of beta stability are crucial for understanding the s-process nucleosynthesis. However, neutron-capture cross sections for short-lived radionuclides are difficult to measure due to th ... Full text Cite

E1 and M1 strength functions at low energy

Conference EPJ Web of Conferences · September 13, 2017 We report photon-scattering experiments using bremsstrahlung at the γELBE facility of Helmholtz-Zentrum Dresden-Rossendorf and using quasi-monoenergetic, polarized γ beams at the HIγS facility of the Triangle Universities Nuclear Laboratory in Durham. To d ... Full text Cite

Photofission cross-section ratio measurement of 235 U/238 U using monoenergetic photons in the energy range of 9.0–16.6 MeV

Journal Article Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · 2017 Cite

Dipole response of the odd-proton nucleus 205Tl up to the neutron-separation energy

Journal Article Journal of Physics G Nuclear and Particle Physics · October 17, 2016 The low-lying electromagnetic dipole strength of the odd-proton nuclide 205Tl has been investigated up to the neutron separation energy exploiting the method of nuclear resonance fluorescence. In total, 61 levels of 205Tl have been id ... Full text Cite

Compound-nuclear reactions with unstable nuclei: Constraining theory through innovative experimental approaches

Conference EPJ Web of Conferences · June 21, 2016 Cross sections for compound-nuclear reactions involving unstable targets are important for many applications, but can often not be measured directly. Several indirect methods have recently been proposed to determine neutron capture cross sections for unsta ... Full text Cite

Reaction-in-Flight neutrons as a test of stopping power in degenerate plasmas

Conference Journal of Physics Conference Series · May 26, 2016 Cryogenically cooled inertial confinement fusion capsule designs are suitable for studies of reaction-in-flight (RIF) neutrons. RIF neutrons occur when energetically up-scattered ions undergo DT reactions with a thermal ion in the plasma, producing neutron ... Full text Cite

The decay pattern of the Pygmy Dipole Resonance of 140Ce

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · May 10, 2016 The decay properties of the Pygmy Dipole Resonance (PDR) have been investigated in the semi-magic N=82 nucleus 140Ce using a novel combination of nuclear resonance fluorescence and γ-γ coincidence techniques. Branching ratios for transitions to ... Full text Cite

Reducing uncertainties for short lived cumulative fission product yields

Journal Article Journal of Radioanalytical and Nuclear Chemistry · March 1, 2016 Uncertainties associated with short lived (half-lives less than 1 day) fission product yields listed in databases such as the National Nuclear Data Center’s ENDF/B-VII are large enough for certain isotopes to provide an opportunity for new precision measur ... Full text Cite

Investigation of the Photon Strength Function in 130 Te

Conference Journal of Physics Conference Series · January 5, 2016 The dipole strength distribution of 130Te was investigated with the method of Nuclear Resonance Fluorescence using continuous-energy bremsstrahlung at the Darmstadt High Intensity Photon Setup and quasi-monoenergetic photons at the High Intensit ... Full text Cite

Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas

Journal Article Physics of Plasmas · August 1, 2015 We present the first measurements of reaction-in-flight (RIF) neutrons in an inertial confinement fusion system. The experiments were carried out at the National Ignition Facility, using both Low Foot and High Foot drives and cryogenic plastic capsules. In ... Full text Cite

Exploratory study of fission product yields of neutron-induced fission of U 235, U 238, and Pu 239 at 8.9 MeV EXPLORATORY STUDY of FISSION PRODUCT YIELDS ... C. BHATIA et al.

Journal Article Physical 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 ... Full text Cite

Nuclear structure studies with gamma-ray beams

Conference EPJ Web of Conferences · May 28, 2015 In stable and weakly bound neutron-rich nuclei, a resonance-like concentration of dipole states has been observed for excitation energies below the neutron-separation energy. This clustering of strong dipole states has been named the Pygmy Dipole Resonance ... Full text Cite

Decay pattern of the pygmy dipole resonance in 140Ce

Conference EPJ Web of Conferences · May 28, 2015 The decay behavior of low-lying dipole states in 140Ce was investigated exploiting the γ3-setup at the HIγS facility using quasi-monochromatic photon beams. Branching ratios of individual excited states as well as average branching ratios to low ... Full text Cite

Dipole strength distributions from HIGS Experiments

Conference EPJ Web of Conferences · May 28, 2015 A series of photon scattering experiments has been performed on the double-beta decay partners 76Ge and 76Se, in order to investigate their dipole response up to the neutron separation threshold. Gamma-ray beams from bremsstrahlung at ... Full text Cite

QPM analysis of 205TI nuclear excitations below the giant dipole resonance

Conference EPJ Web of Conferences · May 28, 2015 We analysed our experimental recent findings of the dipole response of the odd-mass stable nucleus 205Tl within the quasi-particle phonon model. Using the phonon basis constructed for the neighbouring 204Hg and wave function configura ... Full text Cite

Bubble chambers for experiments in nuclear astrophysics

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · May 1, 2015 A bubble chamber has been developed to be used as an active target system for low energy nuclear astrophysics experiments. Adopting ideas from dark matter detection with superheated liquids, a detector system compatible with γ-ray beams has been developed. ... Full text Cite

Separation of the 1+/1- parity doublet in 20Ne

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · February 4, 2015 The (J, T)=(1, 1) parity doublet in 20Ne at 11.26 MeV is a good candidate to study parity violation in nuclei. However, its energy splitting is known with insufficient accuracy for quantitative estimates of parity violating effects. To improve o ... Full text Cite

Magnetic dipole strength in Xe 128 and Xe 134 in the spin-flip resonance region

Journal Article Physical Review C Nuclear Physics · November 10, 2014 The magnetic dipole strength in the energy region of the spin-flip resonance is investigated in Xe128 and Xe134 using quasimonoenergetic and linearly polarized γ-ray beams at the High-Intensity γ-Ray Source facility in Durham, North Carolina, USA. Absorpti ... Full text Cite

Dual-fission chamber and neutron beam characterization for fission product yield measurements using monoenergetic neutrons

Journal Article Nuclear 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 ... Full text Cite

Photoneutron strengths in 26Mg at energies of astrophysical interest

Journal Article Physical Review C Nuclear Physics · May 23, 2014 Background: The 22Ne(α,n)25Mg reaction is an important source of neutrons for s-process nucleosynthesis. The neutron production from the reaction is quite sensitive to the low-energy cross section, which is dominated by narrow resonances. The high level de ... Full text Cite

Spin measurements of n+87Sr for level density studies

Journal Article Nuclear Data Sheets · May 1, 2014 We have used the 4π BaF2 gamma-ray detector array at the n_TOF neutron time-of-flight facility at CERN for an experiment in order to determine the spins of resonances of n+87Sr by measuring the gamma-ray spectra and multiplicity distr ... Full text Cite

Decay pattern of the pygmy dipole resonance in 130Te

Conference EPJ Web of Conferences · April 14, 2014 The electric dipole strength distribution in 130Te has been investigated using the method of Nuclear Resonance Fluorescence. The experiments were performed at the Darmstadt High Intensity Photon Setup using bremsstrahlung as photon source and at ... Full text Cite

Isospin properties of electric dipole excitations in 48Ca

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · March 7, 2014 Two different experimental approaches were combined to study the electric dipole strength in the doubly-magic nucleus 48Ca below the neutron threshold. Real-photon scattering experiments using bremsstrahlung up to 9.9 MeV and nearly mono-energet ... Full text Cite

Determination of the Ce 142 (,n) cross section using quasi-monoenergetic Compton backscattered rays

Journal Article Physical Review C Nuclear Physics · March 7, 2014 Background: Knowing the energy dependence of the (,n) cross section is mandatory to predict the abundances of heavy elements using astrophysical models. The data can be applied directly or used to constrain the cross section of the inverse (n,) reaction. P ... Full text Cite

Photoexcitation of the stable tl isotopes below the neutron separation energy

Conference Acta Physica Polonica B · February 1, 2014 Although the systematics of the Pygmy Dipole Resonance was established in several stable even-even nuclei, the collectivity of this mode, explained in a macroscopic picture as an oscillation of a neutron skin against an isospin symmetric proton-neutron cor ... Full text Cite

Polarized photon scattering of $\^$$52$$ $ Cr: Determining the parity of dipole states

Journal Article Bulletin of the American Physical Society · 2014 Cite

Measurement of reaction-in-ight neutrons using thulium activation at the National Ignition Facility

Conference Proceedings of SPIE the International Society for Optical Engineering · January 1, 2014 We report on the first observation of tertiary reaction-in-ight (RIF) neutrons produced in compressed deuterium and tritium filled capsules using the National Ignition Facility at Lawrence Livermore National Laboratory, Livermore, CA. RIF neutrons are prod ... Full text Cite

Constraining nuclear photon strength functions by the decay properties of photo-excited states

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · December 18, 2013 A new approach for constraining the low-energy part of the electric dipole Photon Strength Function (E1-PSF) is presented. Experiments at the Darmstadt High-Intensity Photon Setup and the High Intensity γ→-Ray Source have been performed to investigate the ... Full text Cite

Dipole response of 76Se above 4 MeV

Journal Article Physical Review C Nuclear Physics · December 6, 2013 The dipole response of 3476Se in the energy range from 4 to 9 MeV has been analyzed using a (γâ-, γ′) polarized photon scattering technique, performed at the High Intensity γ-Ray Source facility at Triangle Universities Nuclear Laboratory, to co ... Full text Cite

Nuclear deformation and neutron excess as competing effects for pygmy dipole strength

Journal Article · November 8, 2013 The electromagnetic dipole strength below the neutron-separation energy has been studied for the xenon isotopes with mass numbers A = 124, 128, 132, and 134 in nuclear resonance fluorescence experiments using the ELBE bremsstrahlung facility at Helmholtz-Z ... Link to item Cite

Low-lying dipole strength of the open-shell nucleus 94Mo

Journal Article Physical Review C Nuclear Physics · October 29, 2013 The low-lying dipole strength of the open-shell nucleus 94Mo was studied via the nuclear resonance fluorescence technique up to 8.7 MeV excitation energy at the bremsstrahlung facility at the Superconducting Darmstadt Electron Linear Accelerator (S-DALINAC ... Full text Cite

Photoresponse of 60Ni below 10-MeV excitation energy: Evolution of dipole resonances in fp-shell nuclei near N=Z

Journal Article Physical Review C Nuclear Physics · October 7, 2013 Background: Within the last decade, below the giant dipole resonance the existence of a concentration of additional electric dipole strength has been established. This accumulation of low-lying E1 strength is commonly referred to as pygmy dipole resonance ... Full text Cite

Cross-section measurements of the 86Kr(γ,n) reaction to probe the s-process branching at 85Kr.

Journal Article Physical review letters · September 2013 We have carried out photodisintegration cross-section measurements on 86Kr using monoenergetic photon beams ranging from the neutron separation energy, S(n) = 9.86  MeV, to 13 MeV. We combine our experimental 86Kr(γ,n)85Kr cross section with results from o ... Full text Cite

The high-efficiency γ-ray spectroscopy setup γ 3 at HIγS

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · June 17, 2013 The existing Nuclear Resonance Fluorescence (NRF) setup at the HIγS facility at the Triangle Universities Nuclear Laboratory at Duke University has been extended in order to perform γ-γ coincidence experiments. The new setup combines large volume LaBr ... Full text Cite

Decay pattern of the pygmy dipole resonance in 60Ni

Journal Article Physical Review C Nuclear Physics · May 15, 2013 Spin-1 states in 60Ni were excited with the (γâ -, γ′) reaction, exploiting the High Intensity γâ - -ray Source at Triangle University Nuclear Laboratory. This facility is capable of providing fully linearly polarized, quasimonochromatic, Compto ... Full text Cite

Ground-state and isomeric-state cross sections for 181Ta(n,2n)180Ta between 8 and 15 MeV

Journal Article Physical Review C Nuclear Physics · March 21, 2013 Using the activation technique, the cross section for the reaction 181Ta(n,2n)180Tag was measured from 8 to 15 MeV in small energy steps to resolve inconsistencies in the existing database. The 93.4 keV γ ray from the decay of the 180Tag ground state was r ... Full text Cite

First determination of an astrophysical cross section with a bubble chamber: The N15(α,γ)F19 reaction

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · February 12, 2013 We have devised a technique for measuring some of the most important nuclear reactions in stars which we expect to provide considerable improvement over previous experiments. Adapting ideas from dark matter search experiments with bubble chambers, we have ... Full text Cite

Pygmy dipole strength in 86Kr and systematics of N=50 isotones

Journal Article Physical Review C Nuclear Physics · February 8, 2013 The dipole strength of the N=50 nucleus 86Kr was studied in photon-scattering experiments using bremsstrahlung produced with electron beams of energies of 7.9 and 11.2 MeV delivered by the linear accelerator ELBE as well as using quasimonoenergetic and lin ... Full text Cite

Active interrogation of nuclear materials using LaBr3: Ce detectors

Journal Article Energy Procedia · January 1, 2013 Active interrogation in 235U was demonstrated with LaBr3:Ce scintillation detectors using the nuclear resonance fluorescence (NRF) technique. An NRF experiment was performed at the High Intensity y-ray Source (HlyS) facility using quasi-monochromatic circu ... Full text Cite

Fine structure of the giant M1 resonance in 90Zr.

Journal Article Physical review letters · January 2013 The M1 excitations in the nuclide 90Zr have been studied in a photon-scattering experiment with monoenergetic and linearly polarized beams from 7 to 11 MeV. More than 40 J(π)=1+ states have been identified from observed ground-state transitions, revealing ... Full text Cite

Kr Isotopic Compositions in Stardust SiC grains and AGB Winds

Conference Proceedings of Science · December 1, 2012 Krypton (Kr) is a heavy noble gas that does not chemically react and hence does not condense into dust. However, it is found in trace amounts inside stardust silicon carbide (SiC) grains in meteorites, which are believed to have condensed in the C-rich env ... Cite

Detection of photon-induced excitations in 235U with LaBr 3:Ce scintillating detectors

Journal Article IEEE Nuclear Science Symposium Conference Record · December 1, 2012 Excitations in 235U were measured with LaBr3:Ce scintillation detectors using the nuclear resonance fluorescence (NRF) technique. A NRF experiment was performed at the High Intensity γ-ray Source (HIγS) facility using quasi-monochroma ... Full text Cite

Searching for illicit materials using nuclear resonance fluorescence stimulated by narrow-band photon sources

Journal Article Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms · August 15, 2012 We report the results of an experimental study of the sensitivity of two distinct classes of systems that exploit nuclear resonance fluorescence (NRF) to search for illicit materials in containers. One class of systems is based on the direct detection of N ... Full text Cite

Electromagnetic dipole strength of 136Ba below the neutron separation energy

Journal Article Physical Review C Nuclear Physics · July 17, 2012 The electromagnetic dipole strength of the nucleus 136Ba has been investigated. Two measurements were performed with electron energies of 7.0 and 11.4 MeV at the bremsstrahlung facility at the ELBE accelerator of the Helmholtz-Zentrum Dresden-Rossendorf. P ... Full text Cite

Photodisintegration cross section of the reaction 4He(γ,n)3He at the giant dipole resonance peak

Journal Article Physical Review C Nuclear Physics · June 1, 2012 The photodisintegration cross section of 4He into a neutron and helion was measured at incident photon energies of 27.0, 27.5, and 28.0 MeV. A high-pressure 4He-Xe gas scintillator served as target and detector while a pure Xe gas scintillator was used for ... Full text Cite

Dipole response of 238U to polarized photons below the neutron separation energy

Journal Article Physical 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 ... Full text Cite

Photodisintegration cross section of the reaction (4)He(γ,p)(3)H between 22 and 30 MeV.

Journal Article Physical review letters · January 2012 The two-body photodisintegration cross section of (4)He into a proton and triton was measured with monoenergetic photon beams in 0.5 MeV energy steps between 22 and 30 MeV. High-pressure (4)He-Xe gas scintillators of various (4)He/Xe ratios served as targe ... Full text Cite

Energy separation of the 1+/1- parity doublet in 20Ne

Conference Journal of Physics Conference Series · January 1, 2012 The parity doublet of 1+/1- states of Ne-20 at 11.26 MeV excitation energy is one of the best known test cases to study the weak part of the nuclear Hamiltonian. The feasibility of parity violation experiments depend on the effective ... Full text Cite

Cross-section measurements of the 86Kr(γ, n) reaction to probe the s-process branching at 85Kr

Conference Journal of Physics Conference Series · January 1, 2012 For the first time, cross-section measurements were carried out for the 86Kr(γ, n) reaction in order to probe the s-process branching point nucleus 85Kr. The branching point nuclei in the s-process path are of importance in testing an ... Full text Cite

Two-body photodisintegration of 3He between 7 and 16 MeV

Journal Article Physics Letters Section B Nuclear Elementary Particle and High Energy Physics · August 11, 2011 A comprehensive data set is reported for the two-body photodisintegration cross section of 3He using mono-energetic photon beams at eleven energies between 7.0 and 16.0 MeV. A He3+Xe high-pressure gas scintillator served as target and detector. ... Full text Cite

Cross-section measurements of neutron-induced reactions on GaAs using monoenergetic beams from 7.5 to 15 MeV

Journal Article Physical 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 ... Full text Cite

Discrete deexcitations in U235 below 3 MeV from nuclear resonance fluorescence

Journal Article Physical 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 pho ... Full text Cite

Investigation of low-lying electric dipole strength in the semimagic nucleus Ca44

Journal Article Physical Review C Nuclear Physics · March 7, 2011 The dipole-strength distribution in the semimagic nucleus Ca44 has been measured up to 10 MeV excitation energy in photon-scattering experiments using bremsstrahlung and monoenergetic 100% linearly polarized photon beams. The combination of both measuremen ... Full text Cite

Cross section measurements of neutron induced reactions on GaAs using monoenergetic beams from 7.5 to 15 MeV

Journal Article Journal 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)3< ... Full text Cite

Coarse and fine structure of the pygmy dipole resonance

Conference Journal of Physics Conference Series · January 1, 2011 High resolution and sensitivity studies of the nuclear dipole response in 138Ba have been performed in (γ, γ′) experiment. The electric dipole character of the "pygmy" mode was experimentally verified for excitations from 4.0 to 8.5 MeV. Experim ... Full text Cite

Fine structure of the giant M1 resonance in 90Zr

Conference Journal of Physics Conference Series · January 1, 2011 M1 excitations in the 90Zr nucleus have been studied in a photon-scattering experiment with monoenergetic and 100% linearly-polarized beams from 7 to 11 MeV. More than 40 Jπ = 1+ states were identified for the first time from the obse ... Full text Cite

Measurement of the Am241(γ,n)Am240 reaction in the giant dipole resonance region

Journal Article Physical 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 Full text Cite

A feasibility study using radiochromic films for fast neutron 2D passive dosimetry.

Journal Article Phys 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 ... Full text Link to item Cite

Photoexcitation of astrophysically important states in Mg26. II. Ground-state-transition partial widths

Journal Article Physical Review C Nuclear Physics · August 9, 2010 The level structure of Mg26 near the neutron-separation energy, which is of interest for s-process nucleosynthesis, was studied at the High Intensity Gamma-Ray Source of the Triangle Universities Nuclear Laboratory using the method of nuclear resonance flu ... Full text Open Access Cite

Ratio of germanium detector peak efficiencies at photon energies of 4.4 and 11.7 MeV: Experiment versus simulation

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · June 1, 2010 Full-energy peak efficiencies of germanium detectors are frequently investigated at γ-ray energies below 4 MeV using calibrated radioactive sources, while very accurate peak efficiencies for higher photon energies are essentially non-existent. Peak efficie ... Full text Cite

Spectral structure of the pygmy dipole resonance.

Journal Article Physical review letters · February 2010 High-sensitivity studies of E1 and M1 transitions observed in the reaction 138Ba(gamma,gamma{'}) at energies below the one-neutron separation energy have been performed using the nearly monoenergetic and 100% linearly polarized photon beams of the HIgammaS ... Full text Open Access Cite

Spin and parity assignments to dipole excitations of the odd-mass nucleus 207Pb from nuclear resonance fluorescence experiments with linearly-polarized γ-ray beams

Conference Journal of Physics Conference Series · January 1, 2010 Pb(γ→,γ′) photon scattering reactions were studied [1] with the nearly monochromatic, linearly polarized photon beams at the High Intensity γ-ray Source (HIγS) at the DFELL. Azimuthal scattering intensity asymmetries measured with res ... Full text Cite

Basis for green energy multiplier*alternative nuclear technology (GEM*ART)

Journal Article Transactions of the American Nuclear Society · December 31, 2009 Cite

Photoexcitation of astrophysically important states in Mg26

Journal Article Physical Review C Nuclear Physics · November 16, 2009 We performed a nuclear resonance fluorescence experiment to determine the energy and quantum numbers of excited states in Mg26. Spin-parity ambiguities of excited states in Mg26, the compound nucleus for the s-process neutron source Ne22(α,n)Mg25, result i ... Full text Cite

Transmission-based detection of nuclides with nuclear resonance fluorescence using a quasimonoenergetic photon source

Journal Article Journal of Applied Physics · November 10, 2009 We provide a detailed experimental validation of the concept of transmission-based isotope detection. The dominant background processes in this class of systems were measured by studying the detection of U238 with a quasimonochromatic (ΔE/E∼3%) ... Full text Cite

Cross sections for U238(n,n'γ) and U238(n,2nγ) reactions at incident neutron energies between 5 and 14 MeV

Journal Article Physical 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 ... Full text Cite

Photodisintegration cross section of241Am

Journal Article Aip 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 th ... Full text Cite

Dipole-strength distributions below the giant dipole resonance in the stable even-mass molybdenum isotopes

Conference Aip Conference Proceedings · May 5, 2009 Dipole-strength distributions in the stable even-mass molybdenum isotopes up to the neutron-separation energies have been studied in photon-scattering experiments with bremsstrahlung at the superconducting electron accelerator ELBE at the Research Center D ... Full text Cite

Recent results from the excitation of dipole states at the HlγS facility

Conference Aip Conference Proceedings · April 23, 2009 High-sensitivity studies of El and Ml excitations observed in the 138Ba(γ,γ') reaction at energies below the neutron emission threshold have been performed. The electric dipole character of the so-called "pygmy" mode was experimentally verified ... Full text Cite

Weak-coupling of the neutron hole in 207Pb to dipole excitations of 208Pb

Conference Aip Conference Proceedings · April 23, 2009 With the nearly monochromatic, linearly polarized photon beam at the High Intensity ray source (HlγS) at DFELL photon scattering experiments on 206207208pb have been performed. With these experiments Pb(γγ) photon scattering reactions could be u ... Full text Cite

Actinide ENDF/B-VII cross-section evaluations and validation testing

Journal Article Annals of Nuclear Energy · April 1, 2009 We describe advances made recently at Los Alamos for ENDF/B-VII, and for future ENDF releases, of actinide cross-section evaluations. Using americium as an illustrative example, we describe recent experiments that have largely confirmed the nuclear theory ... Full text Cite

SU‐FF‐T‐436: Comparison of Neutron Doses to a Water Target Exposed to a 10 MeV Neutron Beam: Foil Activation Method Vs. Monte Carlo Simulations

Conference Medical 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 ... Full text Cite

Neutrons from a proton-driven deuterium target as a possible competitor to spallation for nuclear energy applications

Journal Article Nuclear 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 ... Full text Cite

Reducing Parasitic Thermal Neutron Absorption in Graphite by 30%

Journal Article Nucl. Science and Eng. · 2009 Cite

Multipole mixing ratios of transitions in $^{11}$B

Journal Article Phys. Rev. C · 2009 Photon scattering experiments with photon energies up to 3.6 MeV have been performed on the axially deformed nucleus 164Dy. We observe the -decay from the scissors mode to the -vibration for the first time in a well-deformed rotor. Previous ambiguities i ... Cite

End-to-end spectrum reconstruction method for analyzing Compton gamma-ray beams

Journal Article Nucl. Instr. Methods A · 2009 A gamma-ray beam produced by Compton scattering of a laser beam with a relativistic electron beam has been used for nuclear physics research at the high intensity g-ray source (HIgS) facility at Duke University. The success of many experiments using the ga ... Cite

Energy and energy spread measurements of an electron beam by Compton scattering method

Journal Article Phys. Rev. ST Accel. Beams · 2009 A gamma-ray beam produced by Compton scattering of a laser beam with an electron beam can be used to measure the electron beam parameters. In several published works, a simple fitting model has been applied to determine the electron beam energy and energy ... Cite

Competition Between Excited Core States and $1$ $\hbar \omega$ Single-particle Excitations at Comparable Energies in $^{207}$Pb from Photon Scattering

Journal Article Phys. Lett. B · 2009 The Pb(\vec{γ} ,γ') photon scattering reaction has been studied with the nearly monochromatic, linearly polarized photon beams at the High Intensity γ -ray Source (HIγ S) at the DFELL. Azimuthal scattering intensity asymmetries measured with respect to the ... Cite

Measurement of the Am241(n,2n) reaction cross section from 7.6 MeV to 14.5 MeV

Journal Article Physical 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( ... Full text Cite

Actinide ENDF/B-VII cross section evaluations and validation testing

Conference International Conference on the Physics of Reactors 2008 Physor 08 · January 1, 2008 We describe advances made recently at Los Alamos for ENDF/B-VII, and for future ENDF releases, of actinide cross section evaluations. Using americium as an illustrative example, we describe recent experiments that have largely confirmed the nuclear theory ... Cite

Measurements of thermal neutron diffraction and inelastic scattering in reactor-grade graphite

Journal Article Nuclear Science and Engineering · January 1, 2008 High-resolution Bragg-edge transmission measurements were conducted on granular as well as solid samples of graphite to understand the basis for a bulk measurement of the diffusion length 24% larger than predicted by MCNP5 for bulk reactor-grade graphite. ... Full text Cite

Pulsed and monoenergetic beams for neutron cross-section measurements using activation and scattering techniques at Triangle Universities Nuclear Laboratory

Journal Article Nuclear 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 ... Full text Cite

Study of collective dipole excitations below the giant dipole resonance at HIγS

Journal Article Aip 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 ... Full text Cite

Missing dipole excitation strength below the particle threshold

Conference Proceedings 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. ... Cite

Low-energy dipole modes of excitation below the neutron separation energy

Journal Article Aip 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 f ... Full text Cite

New findings for mixed-symmetry states

Journal Article Aip Conference Proceedings · March 13, 2006 This report summarizes experiments performed on 164Dy using photon scattering techniques. The scissors mode in 164Dy has been reinvestigated using unpolarized photons from bremsstrahlung and polarized photons from a free electron lase ... Full text Cite

Photo-induced population of the h11/2 isomeric states in (γ, n) reactions

Conference Aip Conference Proceedings · March 13, 2006 The mechanism of excitation of isomeric h11/2 states in nuclei around the closed shell at N=82 have been studied at the High-Intensity Gamma Source (HIγS). We have taken advantage of the monoenergetic (ΔE/E=1.5%) and pulsed γ-ray-beam from HIγS ... Full text Cite

First evidence for spin-flip M1 strength in 40A

Journal Article Physical Review C · March 2006 www.aps.org ... Link to item Cite

Astrophysical S factor for the Li7(d,n0)Be8 and Li7(d,n1)Be8 reactions

Journal Article Physical 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 ... Full text Cite

The Li7(d→,n0)Be8 and Li7(d→,n1)Be8 reactions below 160 keV

Journal Article Physical 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 ... Full text Cite

Photon analyzing power for the three-body breakup of 3He at Eγ = 15.0 MeV

Journal Article Aip Conference Proceedings · May 6, 2005 Photon analyzing power for the three-body breakup of 3He has been studied at Eγ = 15.0 MeV. The measurements were done at the HIγS facility at Duke University. © 2005 American Institute of Physics. ... Full text Cite

The high intensity gamma-ray source HIGS and recent measurements

Journal Article Nucl. 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 ... Cite

Compton scattering of polarized γ rays by16O for E γ=25-40 MeV

Journal Article Physical Review C Nuclear Physics · January 1, 2004 Measurements of the polarization asymmetries σ(θ c.m.) and σ(Eγ) of Compton scattering by 16O have been performed in the energy range of 25-40 MeV over a range of scattering angles between 90 and 150°. An analysis of the pr ... Full text Cite

The [Formula Presented] reaction at astrophysically relevant energies

Journal Article Physical Review C - Nuclear Physics · January 1, 2003 The [Formula Presented] reaction was studied by detecting the [Formula Presented]-rays produced when 100-, 130-, and [Formula Presented] polarized protons were stopped in a thick [Formula Presented] target. Polarized and unpolarized incident beams were use ... Full text Cite

Background reduction in FEL-generated gamma-ray beam experiments using giant high-peak power pulses

Journal Article Nuclear Instruments and Methods in Physics Research A · 2003 Link to item Cite

Analyzing power measurement for the [Formula Presented] reaction at astrophysically relevant energies

Journal Article Physical Review C - Nuclear Physics · January 1, 2003 The [Formula Presented] reaction has been investigated by measuring the angular distributions of its cross section and analyzing power using a [Formula Presented] polarized proton beam. Calculations using a direct-capture-plus-resonance model were compared ... Full text Cite

The 10B(p→, γ)11C reaction at astrophysically relevant energies

Journal Article Physical Review C Nuclear Physics · January 1, 2003 The 10B(p→, γ)11C reaction was studied by detecting the γ-rays produced when 100-, 130-, and 160-keV polarized protons were stopped in a thick 10B target. Polarized and unpolarized incident beams were used to measure the cr ... Full text Cite

Analyzing power measurement for the 14N(→p, γ) 15O reaction at astrophysically relevant energies

Journal Article Physical Review C Nuclear Physics · January 1, 2003 The 14N(→p, γ)15O reaction has been investigated by measuring the angular distributions of its cross section and analyzing power using a 270-keV polarized proton beam. Calculations using a direct-capture-plus-resonance model were comp ... Full text Cite

Parity measurements of nuclear dipole excitations using FEL-generated γ-rays at HIγS

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · May 1, 2002 First Nuclear Resonance Fluorescence (NRF) experiments were performed at the storage ring FEL-driven High Intensity Gamma Source (HIγS) at the DFELL. Azimuthal NRF intensity ratios were measured around the polarized HIγS beam. Electric character was deduce ... Full text Cite

Identification of the Jπ=1- two-phonon state of 88Sr

Journal Article Physical Review C Nuclear Physics · January 1, 2002 The linearly polarized γ-ray beam produced by the HIγS facility has been used to determine the parity of two previously known dipole excitations in 88Sr. The azimuthal asymmetry of γ rays produced in the process of nuclear resonance fluorescence ... Full text Cite

Identification of the [Formula Presented] two-phonon state of [Formula Presented]

Journal Article Physical Review C - Nuclear Physics · January 1, 2002 The linearly polarized γ-ray beam produced by the [Formula Presented] facility has been used to determine the parity of two previously known dipole excitations in [Formula Presented] The azimuthal asymmetry of γ rays produced in the process of nuclear reso ... Full text Cite

Izomeric ratios in cross reactions (ny) and (γn)

Journal Article Izvestiya Akademii Nauk Ser Fizicheskaya · December 1, 2001 Cite

Excitation of isomeric 1h11/2 states in nuclear reactions induced by γ rays and neutrons and in beta decay

Journal Article Physics of Atomic Nuclei · November 1, 2001 Isomeric ratios were measured for N = 81 isotones (135Xe, 137Ba, 139Ce, 141Nd, 143Sm). In the experiment reported here, Jπ = 11/2- isomers were excited in (n, γ) and (γ, n) reacti ... Full text Cite

Ratio of S factors for [Formula Presented] reactions on [Formula Presented] and [Formula Presented] at astrophysically relevant energies

Journal Article Physical Review C - Nuclear Physics · January 1, 2001 We present measurements of the [Formula Presented] S factor ratio at [Formula Presented] The overall result of [Formula Presented] is in good agreement with the value of this ratio obtained from previous experimental values of the S factors for the [Formul ... Full text Cite

Excitation of the 180mTa isomer in (gamma,n) reactions and its astrophysical relevance

Journal Article Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine · April 2000 The yield has been determined for the excitation of 180gTa (Jpi = 1+) from the 181Ta(gamma,n) reaction by measurements of gamma rays emitted following the electron capture and beta-decays of the 8.15 h ground state. The probability sigmam/(sigmam + sigmag) ... Full text Cite

Population of isomers in the decay of the giant dipole resonance

Journal Article Physical Review C - Nuclear Physics · January 1, 2000 The value of an isomeric ratio (IR) in [Formula Presented] isotones [Formula Presented] [Formula Presented] and [Formula Presented] is studied by means of the [Formula Presented] reaction. This quantity measures a probability to populate the isomeric state ... Full text Cite

Population of isomers in the decay of the giant dipole resonance

Journal Article Physical Review C Nuclear Physics · January 1, 2000 The value of an isomeric ratio (IR) in N = 81 isotones (137Ba, 139Ce, 141Nd, and 143Sm) is studied by means of the (γ,n) reaction. This quantity measures a probability to populate the isomeric state in respect to ... Full text Cite

New candidates for high spin isomeric targets

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · December 1, 1999 Experimental results of the accumulation and study of reaction mechanism of the de-excitation of high spin isomeric targets 108mAg (Jπ = 6+), 166mHo (Jπ = 7-) and 180mTa (Jπ< ... Full text Cite

Application of low energy photon spectroscopy in isomer production of Hf, W, Ir, Pt, Au and Hg using (γ, γ′) reactions

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · December 1, 1999 In the present work we present results of activation analysis of various heavy metals using bremsstrahlung gammas to create short lived nuclear isomers. The method uses inelastic gamma scattering on natural samples of Hf, W, Ir, Pt, Au, and Hg to produce t ... Full text Cite

Analysis of ore samples employing photon activation of the metastable states of gold and silver

Journal Article Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment · December 1, 1999 The analytical method described here uses inelastic gamma scattering to produce 197mAu(T1/2 = 7.8s), 107mAg(T1/2 = 44.2s) and 109mAg(T1/2 = 39.8s) with the subsequent measurement of residual ... Full text Cite

Isomeric ratios in (γ, p) reactions at giant-dipole-resonance energies

Journal Article Physics of Atomic Nuclei · October 1, 1999 Isomeric ratios in (γ, p) photonuclear reactions have been measured at energies in the giant-dipole-resonance region. In these measurements, 98Mo, 100Ru, 118Sn, 120Sn, and 122Sn isotopes have been expo ... Cite

Deformation on isomeric excitation of Eu isotopes in [Formula Presented] and [Formula Presented] reactions

Journal Article Physical Review C Nuclear Physics · January 1, 1998 Isomeric ratios in [Formula Presented] and [Formula Presented] reactions in Eu isotopes were measured. Thermal neutrons and bremsstrahlung photons in the giant dipole resonance energy range of 13–22 MeV were used to excite the isomeric states. The isomeric ... Full text Cite

Excitation of isomeric states in (γ, n) and (n, γ) reactions on Eu isotopes

Journal Article Physics of Atomic Nuclei · November 1, 1997 Isomeric ratios were measured for (γ, n) and (n, γ) reactions on Eu isotopes, which lie at the boundary between spherical and deformed nuclei. Targets from 151Eu and 153Eu were irradiated by thermal neutrons and by bremsstrahlung phot ... Cite

Excitation of the high-spin 180Hf isomer and de-excitation of the 180Ta isomer in (γ, γ′) reactions

Journal Article Hyperfine Interactions · January 1, 1997 The reaction mechanism of excitation and de-excitation of the high-spin isomers 180Hf (J = 8-) and 180Ta (J = 9-) in inelastic gamma-quanta scattering was investigated. An anomalously large integral cross section ... Full text Cite

Excitation of isomeric states in photonuclear reactions

Journal Article Physics of Particles and Nuclei · July 1, 1996 The experimental data on the probabilities of exciting isomeric states in (γ,γ′) and (γ,n) photonuclear reactions at energies from threshold to the giant dipole resonance are reviewed. The isomeric ratios for g9/2, h11/2, and i13 ... Cite

Excitation of isomeric 1h11/2 states in the reactions (γ, n)

Journal Article Physics of Atomic Nuclei · April 1, 1996 The cross sections for the reactions (γ, n) leading to the ground and isomeric 1h11/2 states in 16 isotopes of Pd, Cd, Sn, Te, Ba, Ce, Nd, and Sm are measured. The energy of γ rays corresponds to the region of the giant dipole resonance. The met ... Cite

Measurement of isomeric ratios in the reactions (γ, n) on barium isotopes in the giant-dipole-resonance region

Journal Article Physics of Atomic Nuclei · March 1, 1996 The cross sections for the reactions (γ, n) in which odd Ba isotopes with A = 129-137 are produced in the ground and isomeric h11/2 states are measured in the giant-dipole-resonance region by an activation method. The isomeric ratio is obtained ... Cite

Calculation of bremsstrahlung spectra from a thick tungsten radiator as a function of photon energy and angle

Journal Article Nuclear Inst and Methods in Physics Research B · August 2, 1992 A method for the calculation of bremsstrahlung spectra produced by 5-30 MeV electrons is described for the case of a thick tungsten radiator at observation angles from 0° to 20°. The computation is based on Shiff integrated-over-angle bremsstrahlung cross- ... Full text Cite

Isomeric yield ratio of134I in photofission of232Th and238U

Journal Article Journal of Radioanalytical and Nuclear Chemistry Letters · January 1, 1991 The isomeric yield ratios for134I, for the photofission of232Th and238U with 25-MeV bremsstrahlung have been determined using radiochemical techniques and γ-spectrometry. Angular moment a of the corresponding fission fragme ... Full text Cite