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NSR database version of May 24, 2024.

Search: Author = J.R.Tompkins

Found 9 matches.

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2015MU09      Phys.Rev. C 92, 034604 (2015)

J.M.Mueller, M.W.Ahmed, B.J.Davis, H.J.Karwowski, D.M.Markoff, L.S.Myers, M.C.Spraker, S.Stave, J.R.Tompkins, H.R.Weller, W.R.Zimmerman

Polarization asymmetries in the 9Be (γ, n0)reaction

NUCLEAR REACTIONS 9Be(polarized γ, n), E=5.5-15.5 MeV from High Intensity γ-ray Source (HIγS) at Duke University and TUNL; measure neutron spectra, time-of-flight spectrum, neutron yields parallel and perpendicular to the plane of beam polarization, polarization asymmetries using nearly 100% linearly polarized and monoenergetic γ-ray beam. Comparison with direct capture calculations using only E1 contributions. Relevance to new method of assaying special nuclear materials (SNM).

doi: 10.1103/PhysRevC.92.034604
Citations: PlumX Metrics


2015WI02      Nucl.Instrum.Methods Phys.Res. A769, 65 (2015)

K.Wimmer, D.Barofsky, D.Bazin, L.M.Fraile, J.Lloyd, J.R.Tompkins, S.J.Williams

IsoTagger: Identification of isomeric nuclear states produced in fragmentation reactions with radioactive beams

RADIOACTIVITY 61Fe, 68Ni(IT); measured Eγ, (particle)γ(t), half-lives of isomers using S-800 spectrograph, GRETINA Ge detector and CsI(Na) scintillation detector arrays at NSCL-MSU facility. New method to detect and identify isomeric states produced in intermediate beam-energy reactions with secondary radioactive beams.

doi: 10.1016/j.nima.2014.09.081
Citations: PlumX Metrics

Data from this article have been entered in the XUNDL database. For more information, click here.


2014LA04      Phys.Rev. C 89, 024002 (2014)

G.Laskaris, Q.Ye, B.Lalremruata, Q.J.Ye, M.W.Ahmed, T.Averett, A.Deltuva, D.Dutta, A.C.Fonseca, H.Gao, J.Golak, M.Huang, H.J.Karwowski, J.M.Mueller, L.S.Myers, C.Peng, B.A.Perdue, X.Qian, P.U.Sauer, R.Skibinski, S.Stave, J.R.Tompkins, H.R.Weller, H.Witala, Y.K.Wu, Y.Zhang, W.Zheng

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

NUCLEAR REACTIONS 3He(polarized γ, n), E=12.8, 14.7 MeV; measured time-of-flight spectra, γ spectra, and neutron spectra from three-body breakup of 3He using 16 liquid scintillator detectors, spin-dependent double-differential σ(E, θ) at HiγS-TUNL facility. Monoenergetic circularly polarized γ beam, and longitudinally polarized 3He target. Comparison with previous experimental results, and with theoretical calculations.

doi: 10.1103/PhysRevC.89.024002
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0181.


2014MU01      Phys.Rev. C 89, 034615 (2014)

J.M.Mueller, M.W.Ahmed, R.H.France, M.S.Johnson, H.J.Karwowski, L.S.Myers, J.Randrup, M.H.Sikora, M.C.Spraker, S.Stave, J.R.Tompkins, R.Vogt, H.R.Weller, C.S.Whisnant, W.R.Zimmerman

Prompt neutron polarization asymmetries in photofission of 232Th, 233, 235, 238U, 237Np, and 239, 240Pu

NUCLEAR REACTIONS 232Th, 233,235,238U, 237Np, 239,240Pu(polarized γ, F), E=5.3-7.6 MeV; measured E(n), I(n), time-of flight spectrum, angular distribution, and polarization asymmetry of prompt neutrons generated by fission, θ(fragment) at HIγS-TUNL facility; deduced angular distribution coefficients b and c, and compared with predicted values from FREYA computer code of event-by-event Monte Carlo prompt neutron+γ-ray emission calculation. Discussed differences in polarization asymmetries between the even-even actinides and odd-A actinides.

doi: 10.1103/PhysRevC.89.034615
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2014WE04      Phys.Rev. C 89, 054001 (2014)

G.J.Weisel, W.Tornow, A.S.Crowell, J.H.Esterline, G.M.Hale, C.R.Howell, P.D.O'Malley, J.R.Tompkins, H.Witala

Neutron-deuteron analyzing power data at En = 22.5 MeV

NUCLEAR REACTIONS 2H(polarized n, n), [polarized neutrons from 2H(polarized d, n) reaction], E=22.5 MeV; measured E(n), I(n), n-d analyzing power Ay(θ) using ABPIS facility at TUNL. Monte-Carlo simulations. Comparison with Faddeev calculations using several different NN potentials. Discussed three-nucleon analyzing power puzzle.

doi: 10.1103/PhysRevC.89.054001
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14395.


2013LA14      Phys.Rev.Lett. 110, 202501 (2013)

G.Laskaris, Q.Ye, B.Lalremruata, Q.J.Ye, M.W.Ahmed, T.Averett, A.Deltuva, D.Dutta, A.C.Fonseca, H.Gao, J.Golak, M.Huang, H.J.Karwowski, J.M.Mueller, L.S.Myers, C.Peng, B.A.Perdue, X.Qian, P.U.Sauer, R.Skibinski, S.Stave, J.R.Tompkins, H.R.Weller, H.Witala, Y.K.Wu, Y.Zhang, W.Zheng

First Measurements of Spin-Dependent Double-Differential Cross Sections and the Gerasimov-Drell-Hearn Integrand from 3He(pol) (γ(pol), n)pp at Incident Photon Energies of 12.8 and 14.7 MeV

NUCLEAR REACTIONS 3He(polarized γ, n), E=12.8, 14.7 MeV; measured reaction products, En, In; deduced σ, σ(θ, E) and their uncertainties, contributions from the three-body photodisintegration to the 3He Gerasimov-Drell-Hearn integrand. Comparison with available data.

doi: 10.1103/PhysRevLett.110.202501
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0181.


2012AR01      Phys.Rev. C 85, 044605 (2012)

C.W.Arnold, T.B.Clegg, C.Iliadis, H.J.Karwowski, G.C.Rich, J.R.Tompkins, C.R.Howell

Cross-section measurement of 9Be(γ, n)8Be and implications for α+α+n → 9Be in the r process

NUCLEAR REACTIONS 9Be(γ, n)8Be, E=1.5-5.2 MeV; measured neutron spectra, Eγ, σ(E) using HIγS facility at TUNL. 9Be; deduced resonance energies, neutron and gamma widths, B(E1), B(M1), neutron branching ratios. Deduced astrophysical reaction rate for 4He(αn, γ)9Be reaction for r-process nucleosynthesis sites. Comparison with previous studies using (γ, n) and (e, e') reactions.

doi: 10.1103/PhysRevC.85.044605
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0171. Data from this article have been entered in the XUNDL database. For more information, click here.


2012MU01      Phys.Rev. C 85, 014605 (2012)

J.M.Mueller, M.W.Ahmed, B.Davis, J.M.Hall, S.S.Henshaw, M.S.Johnson, H.J.Karwowski, D.Markoff, L.S.Myers, B.A.Perdue, S.Stave, J.R.Tompkins, M.J.Tuffley, H.R.Weller

Measurement of prompt neutron polarization asymmetries in photofission of 235, 238U, 239Pu, and 232Th

NUCLEAR REACTIONS 232Th, 235,238U, 239Pu(polarized γ, F), E=5.6-7.3 MeV; measured neutron spectra, prompt fission neutron angular distributions polarization asymmetries using High Intensity γ-ray Source (HIγS). Comparison with simplified model of photofission.

doi: 10.1103/PhysRevC.85.014605
Citations: PlumX Metrics

Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0166.


2011TO10      Phys.Rev. C 84, 044331 (2011)

J.R.Tompkins, C.W.Arnold, H.J.Karwowski, G.C.Rich, L.G.Sobotka, C.R.Howell

Measurements of the 48Ca(γ, n) reaction

NUCLEAR REACTIONS 48Ca(polarized γ, n), E=9.5-15.3 MeV; measured E(n), I(n), Eγ, excitation functions, cross section; deduced B(M1) for 10.23 MeV resonance. High-intensity γ-ray source at TUNL. Comparison with previous studies, and with extended random-phase approximation calculations.

doi: 10.1103/PhysRevC.84.044331
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetL0164.


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