NSR Query Results
Output year order : Descending NSR database version of May 8, 2024. Search: Author = M.Spraker Found 31 matches. 2022LI18 Phys.Rev.Lett. 128, 132502 (2022) X.Li, M.W.Ahmed, A.Banu, C.Bartram, B.Crowe, E.J.Downie, M.Emamian, G.Feldman, H.Gao, D.Godagama, H.W.Griesshammer, C.R.Howell, H.J.Karwowski, D.P.Kendellen, M.A.Kovash, K.K.H.Leung, D.M.Markoff, J.A.McGovern, S.Mikhailov, R.E.Pywell, M.H.Sikora, J.A.Silano, R.S.Sosa, M.C.Spraker, G.Swift, P.Wallace, H.R.Weller, C.S.Whisnant, Y.K.Wu, Z.W.Zhao Proton Compton Scattering from Linearly Polarized Gamma Rays NUCLEAR REACTIONS 1H(polarized γ, γ'), E=83.4 MeV; measured reaction products, Eγ, Iγ; deduced σ(θ), electromagnetic dipole polarizabilities of the proton. The High Intensity Gamma-Ray Source facility at the Triangle Universities Nuclear Laboratory.
doi: 10.1103/PhysRevLett.128.132502
2020LI10 Phys.Rev. C 101, 034618 (2020) X.Li, M.W.Ahmed, A.Banu, C.Bartram, B.Crowe, E.J.Downie, M.Emamian, G.Feldman, H.Gao, D.Godagama, H.W.Griesshammer, C.R.Howell, H.J.Karwowski, D.P.Kendellen, M.A.Kovash, K.K.H.Leung, D.Markoff, S.Mikhailov, R.E.Pywell, M.H.Sikora, J.A.Silano, R.S.Sosa, M.C.Spraker, G.Swift, P.Wallace, H.R.Weller, C.S.Whisnant, Y.K.Wu, Z.W.Zhao Compton scattering from 4He at the TUNL HIγS facility NUCLEAR REACTIONS 4He(polarized γ, γ), E=81.3 MeV, 100% circularly and linearly polarized γ-ray beam via Compton backscattering from HiγS at TUNL; measured Compton scattered photons at different angles, time-of-flight spectra using an array of large NaI(Tl) detectors; deduced differential σ(θ). Comparison with previous experimental data from Lund at Eγ=87 MeV.
doi: 10.1103/PhysRevC.101.034618
2017SI26 Phys.Rev. C 96, 055209 (2017) M.H.Sikora, M.W.Ahmed, A.Banu, C.Bartram, B.Crowe, E.J.Downie, G.Feldman, H.Gao, H.W.Griesshammer, H.Hao, C.R.Howell, H.J.Karwowski, D.P.Kendellen, M.A.Kovash, X.Li, D.M.Markoff, S.Mikhailov, V.Popov, R.E.Pywell, J.A.Silano, M.C.Spraker, P.Wallace, H.R.Weller, C.S.Whisnant, Y.K.Wu, W.Xiong, X.Yan, Z.W.Zhao Compton scattering from 4He at 61 MeV NUCLEAR REACTIONS 4He(γ, γ'), E=61 MeV; measured Eγ, Iγ, Compton scattering differential σ(θ) using NaI(Tl) detectors and liquid 4He target at HIγS facility at TUNL. Data interpreted using phenomenological model sensitive to the dipole isoscalar electromagnetic polarizabilities of the nucleon. Comparison with previous experimental data. Benchmarks for future calculations from effective field theories and lattice quantum chromodynamics.
doi: 10.1103/PhysRevC.96.055209
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
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
2013KA48 Nucl.Instrum.Methods Phys.Res. B316, 48 (2013) A.Kafkarkou, M.W.Ahmed, P.H.Chu, R.H.France, H.J.Karwowski, D.P.Kendellen, G.Laskaris, I.Mazumdar, J.M.Mueller, L.S.Myers, R.M.Prior, M.H.Sikora, M.C.Spraker, H.R.Weller, W.R.Zimmerman Study of the 10B(p, α) reaction between 2.1 and 6.0 MeV NUCLEAR REACTIONS 10B(p, α), E=2.1-6 MeV; measured reaction products, Eα, Iα; deduced σ(θ), S-factors and their uncertainties. Comparison with available data.
doi: 10.1016/j.nimb.2013.08.029
2012SP03 J.Fus.Energy 31, 357 (2012) M.C.Spraker, M.W.Ahmed, M.A.Blackston, N.Brown, R.H.France, S.S.Henshaw, B.A.Perdue, R.M.Prior, P.-N.Seo, S.Stave, H.R.Weller The 11B(p, α)8Be → α + α and the 11B(α, α)11B Reactions at Energies Below 5.4 MeV NUCLEAR REACTIONS 11B(p, α), E=0.15-3.8 MeV; 11B(α, α), E=2-5.4 MeV; measured reaction products, Eα, Iα; deduced σ(θ), Legendre polynomial fits. The Triangle Universities Nuclear Laboratory (TUNL), FN Tandem Van de Graaff and Mini-Tandem accelerators.
doi: 10.1007/s10894-011-9473-5
2011ST01 Phys.Lett. B 696, 26 (2011) S.Stave, M.W.Ahmed, R.H.France III, S.S.Henshaw, B.Muller, B.A.Perdue, R.M.Prior, M.C.Spraker, H.R.Weller Understanding the 11B(p, α)αα reaction at the 0.675 MeV resonance NUCLEAR REACTIONS 11B(p, α), E=2.64 MeV; measured Eα, Iα, α-α coin.; deduced implications on reaction model, astrophysical reaction rates.
doi: 10.1016/j.physletb.2010.12.015
2008AH01 Phys.Rev. C 77, 044005 (2008) M.W.Ahmed, M.A.Blackston, B.A.Perdue, W.Tornow, H.R.Weller, B.Norum, B.Sawatzky, R.M.Prior, M.C.Spraker Near-threshold deuteron photodisintegration: An indirect determination of the Gerasimov-Drell-Hearn sum rule and forward spin polarizability (γ0) for the deuteron at low energies NUCLEAR REACTIONS 2H(polarized γ, n)p, E=2.44, 2.60, 2.72 MeV; measured analyzing power, σ, photon asymmetry, angular distributions, neutron spectra by time-of-flight; deduced Gerasimov-Drell-Hearn sum rule integrand and sum rule integrand for forward spin polarizability. Compared with theoretical predictions.
doi: 10.1103/PhysRevC.77.044005
2008ST10 Phys.Rev. C 77, 054607 (2008) S.Stave, M.W.Ahmed, A.J.Antolak, M.A.Blackston, A.S.Crowell, B.L.Doyle, S.S.Henshaw, C.R.Howell, P.Kingsberry, B.A.Perdue, P.Rossi, R.M.Prior, M.C.Spraker, H.R.Weller Cross section measurements of the 10B(d, n0)11C reaction below 160 keV NUCLEAR REACTIONS 10B(d, n)11C, E<160 keV; measured σ, astrophysical S factors, neutron spectra, angular distributions. Comparison with DWBA and Hauser-Feshbach calculations.
doi: 10.1103/PhysRevC.77.054607
2006PA27 Phys.Rev. C 74, 015804 (2006); Erratum Phys.Rev. C 74, 029903 (2006) Y.Parpottas, M.W.Ahmed, M.A.Blackston, R.H.France III, B.A.Perdue, R.M.Prior, A.Sabourov, M.C.Spraker, H.R.Weller Astrophysical S factor for the 11B(d, n)12C reaction below 135 keV NUCLEAR REACTIONS 11B(d, n), E=120-160 keV; measured En, yields, angular distributions; deduced astrophysical S-factors.
doi: 10.1103/PhysRevC.74.015804
2006SA03 Phys.Rev. C 73, 015801 (2006) A.Sabourov, M.W.Ahmed, M.A.Blackston, A.S.Crowell, C.R.Howell, B.A.Perdue, K.Sabourov, A.Tonchev, H.R.Weller, R.M.Prior, M.C.Spraker Astrophysical S factor for the 7Li(d, n0)8Be and 7Li(d, n1)8Be reactions NUCLEAR REACTIONS 7Li(d, n), E=45, 60, 80 keV; measured neutron spectra, σ(E); deduced integrated yields, astrophysical S-factor.
doi: 10.1103/PhysRevC.73.015801
2006SA49 Phys.Rev.C 74, 064611 (2006) A.Sabourov, M.W.Ahmed, M.A.Blackston, A.S.Crowell, C.R.Howell, K.Joshi, S.O.Nelson, B.A.Perdue, K.Sabourov, A.Tonchev, H.R.Weller, R.M.Prior, M.C.Spraker, B.Braizinha, N.Kalantar-Nayestanaki The 7Li(d(pol), n0)8Be and 7Li(d(pol), n1)8Be reactions below 160 keV NUCLEAR REACTIONS 7Li(polarized d, n), E=80, 130, 160 keV; measured σ(E, θ), analyzing powers; deduced transition matrix elements. Finite-range DWBA calculations, coupled reaction channels calculations.
doi: 10.1103/PhysRevC.74.064611
2004FR30 Phys.Rev. C 70, 044317 (2004) C.Fransen, N.Pietralla, A.P.Tonchev, M.W.Ahmed, J.Chen, G.Feldman, U.Kneissl, J.Li, V.N.Litvinenko, B.Perdue, I.V.Pinayev, H.H.Pitz, R.Prior, K.Sabourov, M.Spraker, W.Tornow, H.R.Weller, V.Werner, Y.K.Wu, S.W.Yates Parity assignments to strong dipole excitations of 92Zr and 96Mo NUCLEAR REACTIONS 92Zr(polarized γ, γ'), E=3.47, 3.64 MeV; 96Mo(γ, γ'), E=2.80, 3.30, 3.43, 3.60, 3.90 MeV; measured Eγ, Iγ, azimuthal asymmetry. 92Zr, 96Mo levels deduced π.
doi: 10.1103/PhysRevC.70.044317
2004PE24 Phys.Rev. C 70, 064305 (2004) B.A.Perdue, M.W.Ahmed, A.P.Tonchev, H.R.Weller, G.Feldman, V.N.Litvinenko, I.V.Pinayev, B.E.Norum, R.M.Prior, M.C.Spraker, B.D.Sawatzky Compton scattering of polarized γ rays by 16O for Eγ = 25-40 MeV NUCLEAR REACTIONS 16O(polarized γ, γ'), E=25-40 MeV; measured polarization asymmetries; deduced resonance features.
doi: 10.1103/PhysRevC.70.064305
2004PR09 Phys.Rev. C 70, 055801 (2004) R.M.Prior, M.C.Spraker, A.M.Amthor, K.J.Keeter, S.O.Nelson, A.Sabourov, K.Sabourov, A.Tonchev, M.Ahmed, J.H.Kelley, D.R.Tilley, H.R.Weller, H.M.Hofmann Energy dependence of the astrophysical S factor for the 6Li(p, γ)7Be reaction NUCLEAR REACTIONS 6Li(polarized p, γ), E=80, 95, 110, 120, 130 keV; measured Eγ, Iγ, analyzing power; deduced energy dependence of astrophysical S-factor.
doi: 10.1103/PhysRevC.70.055801
2004SA61 Phys.Rev. C 70, 064601 (2004) K.Sabourov, M.W.Ahmed, R.S.Canon, B.Crowley, K.Joshi, J.H.Kelley, S.O.Nelson, B.A.Perdue, E.C.Schreiber, A.Sabourov, A.Tonchev, H.R.Weller, E.A.Wulf, R.M.Prior, M.C.Spraker, H.M.Hofmann, M.Trini Experimental and theoretical study of the 2H(d(pol), γ)4He reaction below Ec.m.=60keV NUCLEAR REACTIONS 2H(polarized d, γ), E<115 keV; measured Eγ, Iγ, σ(θ), Ay(θ), T20(θ); deduced transition matrix elements. Comparison with resonating group model predictions.
doi: 10.1103/PhysRevC.70.064601
2003NE17 Phys.Rev. C 68, 065804 (2003) S.O.Nelson, M.W.Ahmed, B.A.Perdue, K.Sabourov, A.L.Sabourov, A.P.Tonchev, R.M.Prior, M.Spraker, H.R.Weller Analyzing power measurement for the 14N(p(pol), γ)15O reaction at astrophysically relevant energies NUCLEAR REACTIONS 14N(polarized p, γ), E=270 MeV; measured σ(θ), Ay(θ); deduced astrophysical S-factors. Comparison with direct-capture-plus-resonance model predictions.
doi: 10.1103/PhysRevC.68.065804
2003TO21 Phys.Rev. C 68, 045803 (2003) A.P.Tonchev, S.O.Nelson, K.Sabourov, B.T.Crowley, K.Joshi, H.R.Weller, J.H.Kelley, R.M.Prior, M.Spraker, N.Kalantar-Nayestanaki The 10B(p(pol), γ)11C reaction at astrophysically relevant energies NUCLEAR REACTIONS 10B(polarized p, γ), E=100, 130, 160 keV; measured Eγ, Iγ, σ(E, θ), Ay(E, θ); deduced astrophysical S-factors, subthreshold resonance. Direct capture model analysis.
doi: 10.1103/PhysRevC.68.045803
2002CA18 Phys.Rev. C65, 044008 (2002) R.S.Canon, S.O.Nelson, K.Sabourov, E.Wulf, H.R.Weller, R.M.Prior, M.Spraker, J.H.Kelley, D.R.Tilley 3H(p(pol), γ)4He Reaction below Ep = 80 keV NUCLEAR REACTIONS 3H(polarized p, γ), E=40, 80 keV; measured σ(θ), Ay(θ); deduced astrophysical S-factors.
doi: 10.1103/PhysRevC.65.044008
2000KE10 Phys.Rev. C62, 025803 (2000) J.H.Kelley, R.S.Canon, S.J.Gaff, R.M.Prior, B.J.Rice, E.C.Schreiber, M.Spraker, D.R.Tilley, E.A.Wulf, H.R.Weller The 11B(p(pol), γ)12C Reaction below 100 keV NUCLEAR REACTIONS 11B(polarized p, γ), E < 100 keV; measured Eγ, Iγ, σ, Ay(θ=90°); deduced astrophysical S factor, influence of low-lying resonances.
doi: 10.1103/PhysRevC.62.025803
2000SC22 Phys.Rev. C61, 061604 (2000) E.C.Schreiber, R.S.Canon, B.T.Crowley, C.R.Howell, J.H.Kelley, V.N.Litvinenko, S.O.Nelson, S.H.Park, I.V.Pinayev, R.M.Prior, K.Sabourov, M.Spraker, W.Tornow, Y.Wu, E.A.Wulf, H.R.Weller First Measurement of the Near-Threshold 2H(γ(pol), n)p Analyzing Power using a Free-Electron Laser Based γ-Ray Source NUCLEAR REACTIONS 2H(polarized γ, n), E=3.58 MeV; measured neutron spectrum, analyzing power; deduced E1, M1 contributions to cross section. Free-electron laser.
doi: 10.1103/PhysRevC.61.061604
2000SP01 Phys.Rev. C61, 015802 (2000) M.Spraker, R.M.Prior, M.A.Godwin, B.J.Rice, E.A.Wulf, J.H.Kelley, D.R.Tilley, H.R.Weller Slope of the Astrophysical S Factor for the 7Li(p, γ)8Be Reaction NUCLEAR REACTIONS 7Li(polarized p, γ), E=40-100 keV; measured yields, analyzing power; deduced slope of astrophysical S factor, role of subthreshold resonance.
doi: 10.1103/PhysRevC.61.015802
2000WU02 Phys.Rev. C61, 021601 (2000) E.A.Wulf, R.S.Canon, S.J.Gaff, J.H.Kelley, R.M.Prior, E.C.Schreiber, M.Spraker, D.R.Tilley, H.R.Weller, M.Viviani, A.Kievsky, S.Rosati, R.Schiavilla New Photodisintegration Threshold Observable in 3He NUCLEAR REACTIONS 2H(polarized p, γ), 1H(polarized d, γ), E=0-80 keV; measured σ(θ), vector and tensor analyzing powers, γ-ray polarization. 3He deduced matrix elements, sum rule features.
doi: 10.1103/PhysRevC.61.021601
1998WU05 Phys.Rev. C58, 517 (1998) E.A.Wulf, M.A.Godwin, J.F.Guillemette, C.M.Laymon, R.M.Prior, B.J.Rice, M.Spraker, D.R.Tilley, H.R.Weller Astrophysical S Factors for the 9Be(p(pol), γ)10B Reaction NUCLEAR REACTIONS 9Be(polarized p, γ), E=100 keV; measured Eγ, Iγ, A(y)(θ); deduced astrophysical S-factors. HPGe detector. Direct capture plus resonance calculation.
doi: 10.1103/PhysRevC.58.517
1997RI15 Phys.Rev. C56, R2917 (1997) B.J.Rice, E.A.Wulf, R.S.Canon, J.H.Kelley, R.M.Prior, M.Spraker, D.R.Tilley, H.R.Weller Direct Determination of the Doublet and Quartet M1 Cross Sections in p-d Radiative Capture at Near-Thermal Energies NUCLEAR REACTIONS 1H(polarized d, γ), E=80 keV; measured T11(θ); analyzed σ(θ), T20(θ); 2H(polarized p, γ), E=40 keV; analyzed A(y); 2H(p, γ), E=80 keV; analyzed γ-polarization; deduced M1 radiative capture σ, meson exchange currents role.
doi: 10.1103/PhysRevC.56.R2917
1997SP08 Nucl.Instrum.Methods Phys.Res. A394, 311 (1997) M.Spraker, B.Ni, J.M.Cameron, F.Jourdan, G.P.A.Berg, D.W.Miller, T.Rinckel Production of a Tagged Medium Resolution Neutron Beam NUCLEAR REACTIONS C, Cu(d, pn), E=260 MeV; measured σ(θ(n), θ(p)) following Coulomb dissociation. Use in tagged neutron beams discussed.
doi: 10.1016/S0168-9002(97)00679-7
1996BE65 Phys.Rev.Lett. 77, 3510 (1996) A.C.Betker, J.M.Cameron, W.W.Jacobs, C.D.Keith, H.Nann, T.Peterson, J.Shao, M.Spraker, J.J.Szymanski, S.E.Vigdor, L.K.Warman, W.K.Pitts Search for the Production of Pionium Atoms Near Threshold NUCLEAR REACTIONS 2H(p, π+π-), E ≈ 430.5 MeV; measured free pion production σ; deduced no pionium production evidence. Gas jet D2 target.
doi: 10.1103/PhysRevLett.77.3510
1994ED01 Phys.Rev. C50, R1749 (1994) T.Eden, R.Madey, W.-M.Zhang, B.D.Anderson, H.Arenhovel, A.R.Baldwin, D.Barkhuff, K.B.Beard, W.Bertozzi, J.M.Cameron, C.C.Chang, G.W.Dodson, K.Dow, M.Farkhondeh, J.M.Finn, B.S.Flanders, C.Hyde-Wright, W.-D.Jiang, D.Keane, J.J.Kelly, W.Korsch, S.Kowalski, R.Lourie, D.M.Manley, P.Markowitz, J.Mougey, B.Ni, T.Payerle, P.J.Pella, T.Reichelt, P.M.Rutt, M.Spraker, D.Tieger, W.Turchinetz, P.E.Ulmer, S.Van Verst, J.W.Watson, L.B.Weinstein, R.R.Whitney Electric Form Factor of the Neutron from the 2H(e(pol), e'n(pol))1H Reaction at Q2 = 0.255 (GeV/c)2 NUCLEAR REACTIONS 2H(polarized e, e'n), E=868 MeV; measured neutron polarization. 1n deduced electric form factor.
doi: 10.1103/PhysRevC.50.R1749
1994ED02 Nucl.Instrum.Methods Phys.Res. A338, 432 (1994) T.Eden, R.Madey, W.-M.Zhang, B.D.Anderson, A.R.Baldwin, J.M.Cameron, J.M.Finn, C.C.Foster, J.J.Kelly, S.Kowalski, R.Lourie, P.Markowitz, B.Ni, P.J.Pella, J.Schambach, M.Spraker, E.Steinfelds, E.J.Stephenson, J.W.Watson Performance of a Neutron Polarimeter to Measure the Electric Form Factor of the Neutron NUCLEAR REACTIONS 14C(polarized p, n), E=138.4 MeV; measured neutron spectra, analyzing power; deduced method suitability for 1n electric form factor extriction studies.
doi: 10.1016/0168-9002(94)91327-7
1993MA21 Phys.Rev. C48, R5 (1993) P.Markowitz, J.M.Finn, B.D.Anderson, H.Arenhovel, A.R.Baldwin, D.Barkhuff, K.B.Beard, W.Bertozzi, J.M.Cameron, C.C.Chang, G.W.Dodson, K.Dow, T.Eden, M.Farkhondeh, B.Flanders, C.Hyde-Wright, W.-D.Jiang, D.Keane, J.J.Kelly, W.Korsch, S.Kowalski, R.Lourie, R.Madey, D.M.Manley, J.Mougey, B.Ni, T.Payerle, P.Pella, T.Reichelt, P.M.Rutt, M.Spraker, D.Tieger, W.Turchinetz, P.E.Ulmer, S.Van Verst, J.W.Watson, L.B.Weinstein, R.R.Whitney, W.M.Zhang Measurement of the Magnetic Form Factor of the Neutron NUCLEAR REACTIONS 2H(e, e'n), E not given; measured en-coin. 1n deduced magnetic form factor. Associated particle technique.
doi: 10.1103/PhysRevC.48.R5
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