NSR Query Results
Output year order : Descending NSR database version of April 11, 2024. Search: Author = M.W.Ahmed Found 45 matches. 2022HO01 J.Phys.(London) G49, 010502 (2022) C.R.Howell, M.W.Ahmed, A.Afanasev, D.Alesini, J.R.M.Annand, A.Aprahamian, D.L.Balabanski, S.V.Benson, A.Bernstein, C.R.Brune, J.Byrd, B.E.Carlsten, A.E.Champagne, S.Chattopadhyay, D.Davis, E.J.Downie, J.M.Durham, G.Feldman, H.Gao, C.G.R.Geddes, H.W.Griesshammer, R.Hajima, H.Hao, D.Hornidge, J.Isaak, R.V.F.Janssens, D.P.Kendellen, M.Kovash, P.P.Martel, U.-G.Meissner, R.Miskimen, B.Pasquini, D.R.Phillips, N.Pietralla, D.Savran, M.R.Schindler, M.H.Sikora, W.M.Snow, R.P.Springer, C.Sun, C.Tang, B.Tiburzi, A.P.Tonchev, W.Tornow, C.A.Ur, D.Wang, H.R.Weller, V.Werner, Y.K.Wu, J.Yan, Z.Zhao, A.Zilges, F.Z.Zomer International workshop on next generation gamma-ray source
doi: 10.1088/1361-6471/ac2827
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
2021LA03 Phys.Rev. C 103, 034311 (2021) G.Laskaris, W.Ji, X.Yan, J.Zhou, W.R.Zimmerman, M.W.Ahmed, T.Averett, A.Deltuva, A.C.Fonseca, H.Gao, J.Golak, A.Kafkarkou, H.J.Karwowski, B.Lalremruata, J.Manfredi, J.M.Mueller, P.U.Sauer, R.Skibinski, A.P.Smith, M.B.Tsang, H.R.Weller, H.Witala, Y.K.Wu, Z.W.Zhao First measurement of the asymmetry and the Gerasimov-Drell-Hearn integrand from the 3He((pol)(γ(pol), p)2H reaction at an incident photon energy of 29 MeV NUCLEAR REACTIONS 3He(polarized γ, p)2H, E=29 MeV; measured Ep, Ip, p(θ), time-of-flight, spin-dependent asymmetry and total σ using a circularly polarized, monoenergetic γ-ray beam and a longitudinally polarized 3He target, and an array of depleted silicon surface barrier detectors at the High Intensity γ-ray Source (HIγS) facility at TUNL; deduced contribution from the two-body photo-disintegration to the 3He Gerasimov-Drell-Hearn (GDH) integrands, and compared with the state-of-the art three-nucleon system calculations.
doi: 10.1103/PhysRevC.103.034311
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
2020SM01 Phys.Rev. C 101, 021302 (2020) R.Smith, M.Gai, M.W.Ahmed, M.Freer, H.O.U.Fynbo, D.Schweitzer, S.R.Stern Stringent upper limit on the direct 3α decay of the Hoyle state in 12C NUCLEAR REACTIONS 12C(γ, α)8Be, E=9.6 MeV; analyzed experimental data in 2013Zi03 and other studies for the energy, width and decay of the second 2+ Hoyle state; deduced upper limit of direct 3α decay mode of the Hoyle state from the experimental value for the upper limit Γ3α for the second 2+ Hoyle state at ≈10 MeV, R-matrix analysis, and semiclassical Wenzel-Kramers-Brillouin approach. Comparison with measured experimental upper limit.
doi: 10.1103/PhysRevC.101.021302
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
2015LA22 Phys.Lett. B 750, 547 (2015) G.Laskaris, X.Yan, J.M.Mueller, W.R.Zimmerman, W.Xiong, M.W.Ahmed, T.Averett, P.-H.Chu, A.Deltuva, C.Flower, A.C.Fonseca, H.Gao, J.Golak, J.N.Heideman, H.J.Karwowski, M.Meziane, P.U.Sauer, R.Skibinski, I.I.Strakovsky, H.R.Weller, H.Witala, Y.K.Wu Measurement of the doubly-polarized 3He(pol)(γ(pol), n)pp reaction at 16.5 MeV and its implications for the GDH sum rule NUCLEAR REACTIONS 3He(polarized γ, n), E=12.8, 14.7 MeV; measured reaction products, Eγ, Iγ, En, In; deduced σ(θ, E), σ, contribution from the three-body channel to the Gerasimov-Drell-Hearn (GDH) integrand. Comparison with available data, Monte Carlo simulations using GEANT4.
doi: 10.1016/j.physletb.2015.09.065
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
2015WU05 Phys.Rev. C 92, 044603 (2015) W.A.Wurtz, R.E.Pywell, B.E.Norum, S.Kucuker, B.D.Sawatzky, H.R.Weller, S.Stave, M.W.Ahmed Photodisintegration of 7Li with progeny nuclei in excited states NUCLEAR REACTIONS 7Li(polarized γ, n)6Li, Eγ=13, 15 MeV, E(6Li) at 2.19, 3.56 MeV; 7Li(polarized γ, d)5He, Eγ=12, 13, 15 MeV, E(5He) at 1.27 MeV decays to n+α; measured neutron kinetic energy spectra, absolute cross sections and angular dependences using the Blowfish Neutron Detector Array. Photon beams from High Intensity Gamma-Ray Source (HIGS) at Duke University.
doi: 10.1103/PhysRevC.92.044603
2014KA04 Phys.Rev. C 89, 014601 (2014); Pub.Note Phys.Rev. C 89, 019902 (2014) A.Kafkarkou, M.W.Ahmed, D.P.Kendellen, I.Mazumdar, J.M.Mueller, L.S.Myers, M.H.Sikora, H.R.Weller, W.R.Zimmerman Cross section measurements of the 10B(p, γ)11C reaction between 2.0 and 6.0 MeV NUCLEAR REACTIONS 10B(p, γ)11C, E=2.0-6.0 MeV; measured Eγ, Iγ, 511-keV annihilation radiation from 11C decay, 11C decay curve, total production σ(E) for 11C by activation method at TUNL tandem accelerator facility; deduced astrophysical S factors. Comparison with previous measurements. Relevance to boron-fueled colliding beam nuclear reactors.
doi: 10.1103/PhysRevC.89.014601
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
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
2014MU14 Nucl.Instrum.Methods Phys.Res. A754, 57 (2014) J.M.Mueller, M.W.Ahmed, H.R.Weller A novel method to assay special nuclear materials by measuring prompt neutrons from polarized photofission NUCLEAR REACTIONS 232Th, 233,235,238U, 237Np, 239,240Pu(γ, F), E=5-7.5 MeV; analyzed available data; deduced polarization asymmetry, absolute uncertainty in the enrichment of a sample, a novel method of assaying the fissile and non-fissile content.
doi: 10.1016/j.nima.2014.03.042
2014MY04 Phys.Rev. C 90, 027603 (2014) L.S.Myers, M.W.Ahmed, G.Feldman, A.Kafkarkou, D.P.Kendellen, I.Mazumdar, J.M.Mueller, M.H.Sikora, H.R.Weller, W.R.Zimmerman Compton scattering from 6Li at 86 MeV NUCLEAR REACTIONS 6Li, 16O(polarized γ, γ), E=86 MeV; measured Eγ, Iγ, σ(θ) at HIγS facility at TUNL; deduced E1, E2, QD resonance parameters. GEANT4 simulations. Discussed nuclear polarizability. Comparison with earlier experimental results for 16O target.
doi: 10.1103/PhysRevC.90.027603
2014WU05 Phys.Rev. C 90, 014613 (2014) W.A.Wurtz, R.E.Pywell, B.E.Norum, S.Kucuker, B.D.Sawatzky, H.R.Weller, S.Stave, M.W.Ahmed Photodisintegration of 6Li NUCLEAR REACTIONS 6Li(polarized γ, p), (polarized γ, n), E=8, 9, 10, 11, 12, 13, 15, 15.6 MeV linearly polarized photons, and E=20, 25, 30, 35 MeV circularly polarized photons; measured En, In, time of flight spectra, σ(E) for (γ, n0), (γ, n1), (γ, n2), (γ, n3), (γ, p1), (γ, p2) and (γ, p3) reaction channels using HIγS facility at TUNL. Legendre function parametrizations, and GEANT4 simulation. Comparison with predictions of Lorentz integral transform calculation using AV4, MN, and MTI-III models.
doi: 10.1103/PhysRevC.90.014613
2013IS14 Phys.Lett. B 727, 361 (2013) J.Isaak, D.Savran, M.Krticka, M.W.Ahmed, J.Beller, E.Fiori, J.Glorius, J.H.Kelley, B.Loher, N.Pietralla, C.Romig, G.Rusev, M.Scheck, L.Schnorrenberger, J.Silva, K.Sonnabend, A.P.Tonchev, W.Tornow, H.R.Weller, M.Zweidinger Constraining nuclear photon strength functions by the decay properties of photo-excited states NUCLEAR REACTIONS 11B, 130Te(γ, γ'), (γ, X), E<10 MeV; measured reaction products, Eγ, Iγ; deduced excited states π quantum numbers within 5.5-8.5 MeV region, γ-ray branching ratio, population intensity. Comparison with DICEBOX simulations, DHIPS and HIγS facilities at Darmstadt and TUNL, respectively.
doi: 10.1016/j.physletb.2013.10.040
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
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
2013WE01 Acta Phys.Pol. B44, 587 (2013) H.R.Weller, M.W.Ahmed, J.M.Mueller, L.S.Myers, W.R.Zimmerman, G.Feldman, M.H.Sikora Precise Determination of the Isovector Giant Quadrupole Resonance in Nuclei NUCLEAR REACTIONS 89Y, 209Bi(γ, γ'), E<36 MeV; measured reaction products, Eγ, Iγ; deduced polarization ratios, IVGQR parameters, Isovector E2 energy weighted sum rule, width, resonance parameters. 124Sn, 142Nd(γ, γ'), E not given; calculated yields.
doi: 10.5506/APhysPolB.44.587
2013ZI03 Phys.Rev.Lett. 110, 152502 (2013) W.R.Zimmerman, M.W.Ahmed, B.Bromberger, S.C.Stave, A.Breskin, V.Dangendorf, Th.Delbar, M.Gai, S.S.Henshaw, J.M.Mueller, C.Sun, K.Tittelmeier, H.R.Weller, Y.K.Wu Unambiguous Identification of the Second 2+ State in 12C and the Structure of the Hoyle State NUCLEAR REACTIONS 12C(γ, α)8Be, E=9.1-10.7 MeV; measured reaction products, Eα, Iα. 12C; deduced second 2+ Hoyle state, widths, B(E2). Comparison with available data.
doi: 10.1103/PhysRevLett.110.152502
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
2012MY05 Phys.Rev. C 86, 044614 (2012) L.S.Myers, M.W.Ahmed, G.Feldman, S.S.Henshaw, M.A.Kovash, J.M.Mueller, H.R.Weller Compton scattering from 6Li at 60 MeV NUCLEAR REACTIONS 6Li, 16O(polarized γ, γ), E=60 MeV; measured Compton scattered γ spectra, angular distributions using High Intensity Gamma-Ray Source (HIγS) at TUNL facility; deduced Compton scattering σ(θ).
doi: 10.1103/PhysRevC.86.044614
2012RA05 Phys.Rev.Lett. 108, 042502 (2012) R.Raut, W.Tornow, M.W.Ahmed, A.S.Crowell, J.H.Kelley, G.Rusev, S.C.Stave, A.P.Tonchev Photodisintegration Cross Section of the Reaction 4He(γ, p)3H between 22 and 30 MeV NUCLEAR REACTIONS 4He(γ, p), E=22-30 MeV; measured reaction products; deduced σ and its uncertainties. Comparison with theoretical calculations.
doi: 10.1103/PhysRevLett.108.042502
2012TO08 Phys.Rev. C 85, 061001 (2012) W.Tornow, J.H.Kelley, R.Raut, G.Rusev, A.P.Tonchev, M.W.Ahmed, A.S.Crowell, S.C.Stave Photodisintegration cross section of the reaction 4He(γ, n)3He at the giant dipole resonance peak NUCLEAR REACTIONS 4He(γ, n)3He, E=27.0, 27.5, 28.0 MeV; measured Eγ, Iγ, angle-integrated σ at GDR peak. Duke University electron storage ring facility. Comparison with previous experimental data, and with theoretical predictions by Trento group based on semirealistic central nucleon-nucleon (NN) potential of the MT I-III type.
doi: 10.1103/PhysRevC.85.061001
2011HE18 Phys.Rev.Lett. 107, 222501 (2011) S.S.Henshaw, M.W.Ahmed, G.Feldman, A.M.Nathan, H.R.Weller New Method for Precise Determination of the Isovector Giant Quadrupole Resonances in Nuclei NUCLEAR REACTIONS 209Bi(γ, γ), E=15-26 MeV; measured reaction products, Eγ, Iγ; deduced parameters of isovector giant quadrupole resonance (IVGQR).
doi: 10.1103/PhysRevLett.107.222501
2011PE08 Phys.Rev. C 83, 034003 (2011) B.A.Perdue, M.W.Ahmed, S.S.Henshaw, P.-N.Seo, S.Stave, H.R.Weller, P.P.Martel, A.Teymurazyan Cross sections for the three-body photodisintegration of 3He at Eγ = 12.8, 13.5, and 14.7 MeV NUCLEAR REACTIONS 3He(γ, n), E=12.8, 13.5, 14.7 MeV; measured En, In, angular distributions, TOF technique, absolute cross sections. Comparisons with phase-space calculations, and the state-of-the-art three-body calculations.
doi: 10.1103/PhysRevC.83.034003
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
2011WU06 Phys.Rev. C 84, 044601 (2011) W.A.Wurtz, R.E.Pywell, B.E.Norum, S.Kucuker, B.D.Sawatzky, H.R.Weller, M.W.Ahmed, S.Stave Measurement of the absolute and differential cross sections for 7Li(γ, n0)6Li NUCLEAR REACTIONS 7Li(γ, n), E=10, 11, 12, 13, 15, 20, 25, 30, 35 MeV; 7Li(polarized γ, n), E=10-15 MeV; measured E(n), I(n), TOF spectra using High Intensity Gamma-Ray Source (HIGS); deduced absolute and differential cross sections, yields, associated Legendre polynomial expansion coefficients for 7Li(γ, n)6Li(g.s.) reaction channel.
doi: 10.1103/PhysRevC.84.044601
2010PI13 J.Phys.:Conf.Ser. 205, 012036 (2010) N.Pietralla, T.C.Li, M.Fritzsche, M.W.Ahmed, D.Savran, A.P.Tonchev, W.Tornow, H.R.Weller, V.Werner Spin and parity assignments to dipole excitations of the odd-mass nucleus 207Pb from nuclear resonance fluorescence experiments with linearly-polarized γ-ray beams NUCLEAR REACTIONS Pb(polarized γ, γ'), E=5400-5700 keV; measured Eγ, Iγ(θ) using HIγS at DFELL. 206,207,208Pb deduced low-lying dipole-excited levels, J, π, E1 γ decay rate.
doi: 10.1088/1742-6596/205/1/012036
2009PI14 Phys.Lett. B 681, 134 (2009) N.Pietralla, T.C.Li, M.Fritzsche, M.W.Ahmed, T.Ahn, A.Costin, J.Enders, J.Li, S.Muller, P.von Neumann-Cosel, I.V.Pinayev, V.Yu.Ponomarev, D.Savran, A.P.Tonchev, W.Tornow, H.R.Weller, V.Werner, Y.K.Wu, A.Zilges Competition between excited core states and 1hω single-particle excitations at comparable energies in 207Pb from photon scattering NUCLEAR REACTIONS 208Pb(polarized γ, γ'), E=5.5, 5.6 MeV; measured Eγ, Iγ using the azimuthal nuclear resonance fluorescence intensity asymmetry technique. 206,207,208Pb; deduced levels, J, π.
doi: 10.1016/j.physletb.2009.09.059
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
2006LI23 Phys.Rev. C 73, 054306 (2006) T.C.Li, N.Pietralla, A.P.Tonchev, M.W.Ahmed, T.Ahn, C.Angell, M.A.Blackston, A.Costin, K.J.Keeter, J.Li, A.Lisetskiy, S.Mikhailov, Y.Parpottas, B.A.Perdue, G.Rainovski, W.Tornow, H.R.Weller, Y.K.Wu First evidence for spin-flip M1 strength in 40Ar NUCLEAR REACTIONS 40Ar(polarized γ, γ'), E=7.7-11 MeV; measured Eγ, Iγ, asymmetry. 40Ar deduced levels, J, π, excitation B(E1), B(M1), spin-flip M1 strength. Comparison with shell model predictions.
doi: 10.1103/PhysRevC.73.054306
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
2005SA15 Phys.Rev. C 71, 034304 (2005) D.Savran, S.Muller, A.Zilges, M.Babilon, M.W.Ahmed, J.H.Kelley, A.Tonchev, W.Tornow, H.R.Weller, N.Pietralla, J.Li, I.V.Pinayev, Y.K.Wu Parity assignments in 172, 174Yb using polarized photons and the K quantum number in rare earth nuclei NUCLEAR REACTIONS 172,174Yb(polarized γ, γ'), E=2930, 3005, 3550 keV; measured Eγ, Iγ, asymmetries. 172,174Yb levels deduced π. Parity and branching ratio systematics discussed.
doi: 10.1103/PhysRevC.71.034304
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
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
2003AH09 Phys.Rev. C 68, 064004 (2003) M.W.Ahmed, X.Cui, A.Empl, E.V.Hungerford, K.J.Lan, M.Youn, R.E.Chrien, R.Gill, P.Pile, A.Rusek, R.Sutter, J.Bjoraker, D.Dehnhard, J.M.O'Donnell, J.Gerald, H.Juengst, J.H.Liu, J.C.Peng, C.L.Morris, C.M.Riedel, H.A.Thiessen, D.Androic, I.Bertovic, M.Furic, T.Petkovic, M.Planinic, L.Tang, V.Zeps Experimental study of the 12C(K-stopped, π0)12ΛB reaction NUCLEAR REACTIONS 12C(K-, π0), E at rest; measured pion spectra; deduced hypernucleus production ground and excited state branching ratios. 12B deduced hyperon binding energy.
doi: 10.1103/PhysRevC.68.064004
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
2002PI02 Phys.Rev.Lett. 88, 012502 (2002) N.Pietralla, Z.Berant, V.N.Litvinenko, S.Hartman, F.F.Mikhailov, I.V.Pinayev, G.Swift, M.W.Ahmed, J.H.Kelley, S.O.Nelson, R.Prior, K.Sabourov, A.P.Tonchev, H.R.Weller Parity Measurements of Nuclear Levels using a Free-Electron-Laser Generated γ-Ray Beam NUCLEAR REACTIONS 138Ba(polarized γ, γ'), E ≈ 5.62 MeV; measured Eγ, Iγ, azimuthal asymmetries. 138Ba levels deduced π. Nuclear resonance fluorescence, free-electron laser, comparisons with previous results.
doi: 10.1103/PhysRevLett.88.012502
2002PI08 Phys.Rev. C65, 047305 (2002); Erratum Phys.Rev. C65, 069901 (2002) N.Pietralla, V.N.Litvinenko, S.Hartman, F.F.Mikhailov, I.V.Pinayev, G.Swift, M.W.Ahmed, J.H.Kelley, S.O.Nelson, R.Prior, K.Sabourov, A.P.Tonchev, H.R.Weller Identification of the Jπ = 1- Two-Phonon State of 88Sr NUCLEAR REACTIONS 88Sr(polarized γ, γ'), E=4.74, 5.02, 7.54 MeV; measured Eγ, Iγ, azimuthal asymmetry. 88Sr level deduced J, π.
doi: 10.1103/PhysRevC.65.047305
1998AH08 Nucl.Phys. A639, 117c (1998) Characteristics of an Active Chamber Target to Locate the Reaction Vertex in the (K-stopped, π0) Reaction
doi: 10.1016/S0375-9474(98)00259-0
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