NSR Query Results
Output year order : Descending NSR database version of April 11, 2024. Search: Author = R.J.Casperson Found 57 matches. 2022MO03 Nucl.Instrum.Methods Phys.Res. A1021, 165864 (2022) M.Monterial, K.T.Schmitt, C.Prokop, E.Leal-Cidoncha, M.Anastasiou, N.S.Bowden, J.Bundgaard, R.J.Casperson, D.A.Cebra, T.Classen, D.H.Dongwi, N.Fotiades, J.Gearhart, V.Geppert-Kleinrath, U.Greife, C.Hagmann, M.Heffner, D.Hensle, D.Higgins, L.D.Isenhower, K.Kazkaz, A.Kemnitz, J.King, J.L.Klay, J.Latta, W.Loveland, J.A.Magee, B.Manning, M.P.Mendenhall, S.Mosby, D.Neudecker, S.Sangiorgio, B.Seilhan, L.Snyder, F.Tovesson, R.S.Towell, N.Walsh, T.S.Watson, L.Yao, W.Younes Measurement of material isotopics and atom number ratio with α-particle spectroscopy for a NIFFTE fission Time Projection Chamber actinide target NUCLEAR REACTIONS 235U, 239Pu(n, F), E not given; measured fission products, Eα, Iα; deduced isotopic concentrations and atomic number ratio.
doi: 10.1016/j.nima.2021.165864
2020NE03 Nucl.Data Sheets 163, 228 (2020) D.Neudecker, D.L.Smith, F.Tovesson, R.Capote, M.C.White, N.S.Bowden, L.Snyder, A.D.Carlson, R.J.Casperson, V.Pronyaev, S.Sangiorgio, K.T.Schmitt, B.Seilhan, N.Walsh, W.Younes Applying a Template of Expected Uncertainties to Updating 239Pu(n, f) Cross-section Covariances in the Neutron Data Standards Database
doi: 10.1016/j.nds.2019.12.005
2019AK03 Phys.Rev. C 99, 054601 (2019) O.A.Akindele, B.S.Alan, J.T.Burke, R.J.Casperson, R.O.Hughes, J.D.Koglin, K.Kolos, E.B.Norman, S.Ota, A.Saastamoinen Expansion of the surrogate method to measure the prompt fission neutron multiplicity for 241Pu NUCLEAR REACTIONS 242Pu(α, α'), (α, F), E=53.96 MeV; measured scattered α particles and other reaction products, neutrons, light charged particles p, d, t, 3He, α(fission fragment)- and αn-coin using the NeutronSTARS array for charged particle and neutron detection at the Cyclotron Institute of Texas A and M University. 241Pu(n, F), E<20 MeV; deduced average neutron multiplicity, and derived neutron multiplicity moments as a function of equivalent neutron energy using the surrogate method. Comparison with previous experimental values.
doi: 10.1103/PhysRevC.99.054601
2019RA04 Phys.Rev.Lett. 122, 052502 (2019) A.Ratkiewicz, J.A.Cizewski, J.E.Escher, G.Potel, J.T.Burke, R.J.Casperson, M.McCleskey, R.A.E.Austin, S.Burcher, R.O.Hughes, B.Manning, S.D.Pain, W.A.Peters, S.Rice, T.J.Ross, N.D.Scielzo, C.Shand, K.Smith Towards Neutron Capture on Exotic Nuclei: Demonstrating (d, pγ) as a Surrogate Reaction for (n, γ) NUCLEAR REACTIONS 95Mo(d, p), E=12.4 MeV; measured reaction products, Eγ, Iγ; deduced σ. Comparison with theoretical calculations.
doi: 10.1103/PhysRevLett.122.052502
2019WA33 Phys.Rev. C 100, 064609 (2019) B.S.Wang, J.T.Harke, O.A.Akindele, R.J.Casperson, R.O.Hughes, J.D.Koglin, K.Kolos, E.B.Norman, S.Ota, A.Saastamoinen Determining the average prompt-fission-neutron multiplicity for 239Pu(n, f) via a 240Pu(α, α' f) surrogate reaction NUCLEAR REACTIONS 240Pu(α, α'F), E=53.9 MeV; measured fission fragments, charged particles, scattered α particles, Eα, Iα, E(n), I(n), α(fission fragment)- and αn(fission fragment)-coin using the NeutronSTARS array and NeutronBall at the K150 Cyclotron facility of Texas A and M University; deduced particle-identification plot for p, d, t, 3He and α particles. 239Pu(n, F), E=0.25-26.25 MeV; deduced average prompt-fission-neutron multiplicity using the results from surrogate reaction 240Pu(α, a°F). Comparison with previous experimental results from direct measurements.
doi: 10.1103/PhysRevC.100.064609
2018BR05 Nucl.Data Sheets 148, 1 (2018) D.A.Brown, M.B.Chadwick, R.Capote, A.C.Kahler, A.Trkov, M.W.Herman, A.A.Sonzogni, Y.Danon, A.D.Carlson, M.Dunn, D.L.Smith, G.M.Hale, G.Arbanas, R.Arcilla, C.R.Bates, B.Beck, B.Becker, F.Brown, R.J.Casperson, J.Conlin, D.E.Cullen, M.-A.Descalle, R.Firestone, T.Gaines, K.H.Guber, A.I.Hawari, J.Holmes, T.D.Johnson, T.Kawano, B.C.Kiedrowski, A.J.Koning, S.Kopecky, L.Leal, J.P.Lestone, C.Lubitz, J.I.Marquez Damian, C.M.Mattoon, E.A.McCutchan, S.Mughabghab, P.Navratil, D.Neudecker, G.P.A.Nobre, G.Noguere, M.Paris, M.T.Pigni, A.J.Plompen, B.Pritychenko, V.G.Pronyaev, D.Roubtsov, D.Rochman, P.Romano, P.Schillebeeckx, S.Simakov, M.Sin, I.Sirakov, B.Sleaford, V.Sobes, E.S.Soukhovitskii, I.Stetcu, P.Talou, I.Thompson, S.van der Marck, L.Welser-Sherrill, D.Wiarda, M.White, J.L.Wormald, R.Q.Wright, M.Zerkle, G.Zerovnik, Y.Zhu ENDF/B-VIII.0: The 8 th Major Release of the Nuclear Reaction Data Library with CIELO-project Cross Sections, New Standards and Thermal Scattering Data COMPILATION Z=1-118; compiled, analyzed decay data, Maxwellian averaged neutron capture σ, neutron-induced fission σ. NUCLEAR REACTIONS 1,2H, 3He, 6,7Li, 9Be, 10,11B, 12,13C, 14,15N, 16,17,18O, 19F, 20,21,22Ne, 22,23Na, 24,25,26Mg, 26,27Al, 28,29,30,31,32Si, 31P, 32,33,34,35,36S, 35,36,37Cl, 36,37,38,39,40,41Ar, 39,40,41K, 40,41,42,43,44,45,46,47,48Ca, 45Sc, 46,47,48,49,50Ti, 49,50,51V, 50,51,52,53,54Cr, 54,55Mn, 54,55,56,57,58Fe, 58,59Co, 58,59,60,61,62,63,64Ni, 63,64,65Cu, 64,65,66,67,68,69,70Zn, 69,70,71Ga, 70,71,72,73,74,75,76Ge, 73,74,75As, 74,75,76,77,78,79,80,81,82Se, 79,80,81Br, 78,79,80,81,82,83,84,85,86Kr, 85,86,87Rb, 84,85,86,87,88,89,90Sr, 89,90,91Y, 90,91,92,93,94,95,96Zr, 93,94,95Nb, 92,93,94,95,96,97,98,99,100Mo, 98,99Tc, 96,97,98,99,100,101,102,103,104,105,106Ru, 103,104,105Rh, 102,103,104,105,106,107,108,109,110Pd, 107,108,109,110,111,112,113,114,115,116,117,118Ag, 106,107,108,109,110,111,112,113,114,115,116Cd, 113,114,115In, 112,113,114,115,116,117,118,119,120,121,122,123,124,125,126Sn, 121,122,123,124,125,126Sb, 120,121,122,123,124,125,126,127,128,129,130,121,132Te, 127,128,129,130,131,132,133,134,135I, 123,124,125,126,127,128,129,130,131,132,133,134,135,136Xe, 133,134,135,136,137Cs, 130,131,132,133,134,135,136,137,138,139,140Ba, 138,139,140La, 136,137,138,139,140,141,142,143,144Ce, 141,142,143Pr, 142,143,144,145,146,147,148,149,150Nd, 143,144,145,146,147,148,149,151Pm, 144,145,146,147,148,149,150,151,152,153,154Sm, 151,152,153,154,155,156,157Eu, 152,153,154,155,156,157,158,159,160Gd, 158,159,160,161Tb, 154,155,156,157,158,159,160,161,162,163,164Dy, 165,166Ho, 162,163,164,165,166,167,168,170,170Er, 168,169,170,171Tm, 168,169,170,171,172,173,174,175,176Yb, 175,176Lu, 174,175,176,177,178,179,180,181,182Hf, 180,181,182Ta, 180,181,182,183,184,185,186W, 185,186,187Re, 184,185,186,187,188,189,190,191,192Os, 191,192,193Ir, 190,191,192,193,194,195,196,197,198Pt, 197Au, 196,197,198,199,200,201,202,203,204Hg, 203,204,205Tl, 204,205,206,207,208,209,210Pb, 209,210Bi, 208,209,210Po, 223,224,225,226Ra, 225,226,227Ac, 227,228,229,230,231,232,233,234Th, 229,230,231,232,233Pa, 230,231,232,233,234,235,236,237,238,239,240,241U, 234,235,236,237,238,239Np, 236,237,238,239,240,241,242,243,244,245,246Pu, 240,241,242,243,244Am, 240,241,242,243,244,245,246,247,248,249,250Cm, 245,246,247,248,249,250Bk, 246,247,248,249,250,251,252,253,254Cf, 251,252,253,254,255Es, 255Fm(n, γ), E=30 keV; calculated Maxwellian-averaged σ using ENDF/B-VIII.0 evaluated neutron library. Comparison with ENDF/B-VII.1 and KADONIS values. NUCLEAR REACTIONS 227,228,229,230,231,232,233,234Th, 229,230,231,232,233Pa, 230,231,232,233,234,235,236,237,238,239,240,241U, 234,235,236,237,238,239Np, 236,237,238,239,240,241,242,243,244,245,246Pu, 240,241,242,243,244Am, 240,241,242,243,244,245,246,247,248,249,250Cm, 245,246,247,248,249,250Bk, 246,247,248,249,250,251,252,253,254Cf, 251,252,253,254,255Es, 255Fm(n, γ), (n, F), E=thermal; calculated thermal σ. Comparison with ENDF/B-VII.1, JENDL-4.0u+ and Atlas of Neutron Resonances values.
doi: 10.1016/j.nds.2018.02.001
2018CA10 Phys.Rev. C 97, 034618 (2018) R.J.Casperson, for the NIFFTE Collaboration Measurement of the normalized 238U(n, f)/235U(n, f) cross section ratio from threshold to 30 MeV with the NIFFTE fission Time Projection Chamber NUCLEAR REACTIONS 235,238U(n, F), E=threshold to 30 MeV; measured fission events, α particles, time-of-flight, energies of fission fragments as function of emission angle, normalized 238U(n, F)/235U(n, F) cross section ratios using the NIFFTE fission time projection chamber (fission TPC) consisting of two-volume MICROMEGAS time projection chamber allowing three-dimensional reconstruction of fission-fragment ionization profiles at the Weapons Neutron Research (WNR) facility of the Los Alamos Neutron Science Center (LANSCE); compiled previous experimental data from 1968 to 2014, and comparison with evaluated data in ENDF/B-VIII.β5 and ENDF/B-VII.1.
doi: 10.1103/PhysRevC.97.034618
2018ES05 Phys.Rev.Lett. 121, 052501 (2018) J.E.Escher, J.T.Burke, R.O.Hughes, N.D.Scielzo, R.J.Casperson, S.Ota, H.I.Park, A.Saastamoinen, T.J.Ross Constraining Neutron Capture Cross Sections for Unstable Nuclei with Surrogate Reaction Data and Theory NUCLEAR REACTIONS 87Y(n, γ), E<10 MeV; analyzed available data; deduced σ using surrogate reaction data. Comparison with TENDL 2015 and ROSFOND 2010 libraries. 89Y, 92Zr(p, d), E*=6-12 MeV; calculated σ(E, θ), probability of observing specific γ-ray in coincidence with outgoing deuteron; compared with available data.
doi: 10.1103/PhysRevLett.121.052501
2017MU04 Phys.Rev. C 95, 015805 (2017) J.M.Munson, E.B.Norman, J.T.Burke, R.J.Casperson, L.W.Phair, E.McCleskey, M.McCleskey, D.Lee, R.O.Hughes, S.Ota, A.Czeszumska, P.A.Chodash, A.J.Saastamoinen, R.A.E.Austin, A.E.Spiridon, M.Dag, R.Chyzh, M.S.Basunia, J.J.Ressler, T.J.Ross Decay branching ratios of excited 24Mg NUCLEAR REACTIONS 24Mg(α, α'), E=40 MeV; measured decay products identified by outgoing α particles, protons and γ rays from the resulting 20Ne, 23Na, and 23Mg daughters, (particle)(particle)-coin, αγ-coin using the STARLiTeR detector array at Texas A and M K150 cyclotron facility; deduced branching ratios for α-, proton- and neutron-emitting channels from the decay of unbound states in 24Mg. Possible surrogate reaction for 12C(12C, α)20Ne, 12C(12C, p)23Na, 12C(12C, n)23Mg reactions of astrophysical interest. 20Ne, 23Na, 23Mg; deduced levels populated by the decay of excited states of 24Mg.
doi: 10.1103/PhysRevC.95.015805
2016CH11 Phys.Rev. C 93, 034610 (2016) P.A.Chodash, J.T.Burke, E.B.Norman, S.C.Wilks, R.J.Casperson, S.E.Fisher, K.S.Holliday, J.R.Jeffries, M.A.Wakeling Nuclear excitation by electronic transition of 235U NUCLEAR REACTIONS 235U(e, e'), E=low; measured decay spectra and half-lives from possible excitation of ≈26 min-235mU isomer at 76 eV by nuclear excitation by electronic transition (NEET) process; deduced no evidence for occurrence of NEET, upper limit determined. Used natural, depleted, and enriched uranium samples. Reviewed previous NEET experiments on 235U. RADIOACTIVITY 235mU(IT)[from 239Pu(α)]; measured half-life of the decay of 235mU isomer at 76 eV by collecting uranium recoils in argon gas.
doi: 10.1103/PhysRevC.93.034610
2016HU02 Phys.Rev. C 93, 024315 (2016) R.O.Hughes, J.T.Burke, R.J.Casperson, J.E.Escher, S.Ota, J.J.Ressler, N.D.Scielzo, R.A.E.Austin, B.Abromeit, N.J.Foley, E.McCleskey, M.McCleskey, H.I.Park, T.J.Ross, A.Saastamoinen Investigation of 88Y via (p, dγ) reactions NUCLEAR REACTIONS 89Y(p, d), E=28.5 MeV; measured E(d), I(d), Eγ, Iγ, dγ-, dγγ-coin, dγ(t) using STARLiTeR array of Si detectors for deuteron detection and five HPGe clover detectors for γ rays at Texas A and M Cyclotron Institute. 88Y; deduced levels, J, π, level population intensities. Discussed effect of γ-branching ratios in 88Y on determination of 87Y(n, γ) cross section via surrogate method.
doi: 10.1103/PhysRevC.93.024315
2016HU22 Phys.Rev. C 94, 064314 (2016) P.Humby, A.Simon, C.W.Beausang, J.M.Allmond, J.T.Burke, R.J.Casperson, R.Chyzh, M.Dag, K.Gell, R.O.Hughes, J.Koglin, E.McCleskey, M.McCleskey, S.Ota, T.J.Ross, A.Saastamoinen, T.Tarlow, G.Vyas Investigation of discrete states and quasidiscrete structures observed in 150Sm and 152Sm using the (p, tγ) reaction NUCLEAR REACTIONS 152,154Sm(p, t), E=25 MeV; measured triton spectra, Eγ, Iγ, (triton)γ-, (triton)γγ-coin, σ(θ), angular distribution of peak-like structure (PLS) using the STARLiTeR array at Texas A and M cyclotron facility. Enriched targets. 150,152Sm; deduced levels, J, π, L-transfers. DWBA analysis of σ(θ) data. Comparison with evaluated data taken from the ENSDF database.
doi: 10.1103/PhysRevC.94.064314
2016SI07 Phys.Rev. C 93, 034303 (2016) A.Simon, M.Guttormsen, A.C.Larsen, C.W.Beausang, P.Humby, J.T.Burke, R.J.Casperson, R.O.Hughes, T.J.Ross, J.M.Allmond, R.Chyzh, M.Dag, J.Koglin, E.McCleskey, M.McCleskey, S.Ota, A.Saastamoinen First observation of low-energy γ-ray enhancement in the rare-earth region NUCLEAR REACTIONS 152,154Sm(p, dγ), E=25 MeV; measured reaction products, Eγ, Iγ, (particle)γ-coin, γ(θ) using STARLiTeR setup for charged-particles, and Ge clover detectors with Compton suppressors for γ rays at K-150 cyclotron at Texas A and M; deduced level density (LD) and γ-ray strength function (γSF) using OSLO method, multipolarity, enhanced low-energy γ-ray strength for rare-earth nuclei, coexistence with the scissors resonance. Comparison with Hauser-Feshbach calculations. Calculated ratios of Maxwellian-averaged (n, γ) reaction rates at T9=0.15 and 1.5 for A=145-202 Sm isotopes.
doi: 10.1103/PhysRevC.93.034303
2015HU02 Phys.Rev. C 91, 024322 (2015) P.Humby, A.Simon, C.W.Beausang, T.J.Ross, R.O.Hughes, J.T.Burke, R.J.Casperson, J.Koglin, S.Ota, J.M.Allmond, M.McCleskey, E.McCleskey, A.Saastamoinen, R.Chyzh, M.Dag, K.Gell, T.Tarlow, G.Vyas Improved measurement of the half-life of the Jπ = 8- nuclear isomer 152m2Eu NUCLEAR REACTIONS 154Sm(p, 3n)152mEu, E=25 MeV; measured Eγ, Iγ, delayed γ, half-lives of 0- and 8- isomers in 152Eu by γ(t) using STARS array for particle detection and LiTer array for γ detection at the Texas A and M, K-150 cyclotron facility. Comparison with earlier experimental results. RADIOACTIVITY 152Eu(β-), (EC)[from 154Sm(p, 3n), E=25 MeV]; measured Eγ, Iγ, half-life of the 0- isomer in 152Eu. Comparison with earlier experimental results.
doi: 10.1103/PhysRevC.91.024322
2015OT02 Phys.Rev. C 92, 054603 (2015) S.Ota, J.T.Burke, R.J.Casperson, J.E.Escher, R.O.Hughes, J.J.Ressler, N.D.Scielzo, I.J.Thompson, R.A.E.Austin, B.Abromeit, N.J.Foley, E.McCleskey, M.McCleskey, H.I.Park, A.Saastamoinen, T.J.Ross Spin differences in the 90Zr compound nucleus induced by (p, p'), (p, d), and (p, t) surrogate reactions NUCLEAR REACTIONS 90Zr(p, p'), (p, np), 91Zr(p, d), 92Zr(p, t), E=28.56 MeV; measured light-ion particle spectra, angular distributions, Eγ, Iγ, (particle)γ-coin, using STARLiTeR detector system at Texas A and M cyclotron facility; deduced γ-decay probabilities as functions of 90Zr excitation energy, angular momentum, and particle scattering angle. Enriched targets. 89,90Zr; deduced levels, J, π. 89Zr(n, γ); discussed relevance to determination of σ by surrogate reaction approach.
doi: 10.1103/PhysRevC.92.054603
2014CA31 Phys.Rev. C 90, 034601 (2014) R.J.Casperson, J.T.Burke, N.D.Scielzo, J.E.Escher, E.McCleskey, M.McCleskey, A.Saastamoinen, A.Spiridon, A.Ratkiewicz, A.Blanc, M.Kurokawa, R.G.Pizzone Measurement of the 240Am (n, f) cross section using the surrogate-ratio method NUCLEAR REACTIONS 243Am, 238U(p, F)3H, 243Am, 238U(p, p'), (p, d), E=38.4 MeV; measured particle and fission fragment spectra, (particle)(fission fragment)-coin using STARLiTeR array of Si detectors at Texas A and M facility. 235U, 240Am(n, F), E=200 keV-14 MeV; deduced σ(E) using results for surrogate reactions 243Am, 238U(p, F)3H. Comparison with previous experimental results. Comparison with several evaluated libraries shows disagreement and a need for re-evaluation.
doi: 10.1103/PhysRevC.90.034601
2014HU12 Phys.Rev. C 90, 014304 (2014) R.O.Hughes, C.W.Beausang, T.J.Ross, J.T.Burke, R.J.Casperson, N.Cooper, J.E.Escher, K.Gell, E.Good, P.Humby, M.McCleskey, A.Saastimoinen, T.D.Tarlow, I.J.Thompson 236Pu(n, f), 237Pu(n, f), and 238Pu(n, f) cross sections deduced from (p, t), (p, d), and (p, p') surrogate reactions NUCLEAR REACTIONS 235U, 239Pu(p, t), (p, d), (p, p'), E=28.5 MeV; measured particle and γ spectra, (particle)γ-, (particle)(particle)-, (d)(fission)-coin, cross sections using STARLiTeR array at Texas A-M cyclotron facility. 232,233U, 236,237Pu(n, F), E=0.5-7.5 MeV; deduced σ(E) ratios. 238Pu(n, F), E=0.5-10.5 MeV; deduced σ(E) from (p, p') and σ for 234U(n, F) in ENDF/B-VII evaluation. Surrogate ratio method. Comparison with ENSDF/B-VII evaluations, and some previous experimental results.
doi: 10.1103/PhysRevC.90.014304
2014RO25 Phys.Rev. C 90, 044323 (2014) T.J.Ross, R.O.Hughes, J.M.Allmond, C.W.Beausang, C.T.Angell, M.S.Basunia, D.L.Bleuel, J.T.Burke, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.W.Phair, J.J.Ressler, N.D.Scielzo Spectroscopy of 153Gd and 157Gd using the (p, dγ) reaction NUCLEAR REACTIONS 154,158Gd(p, d), E=25 MeV; measured Eγ, Iγ, E(d), I(d), dγ-, dγγ-coin, d(θ) in coincidence with γ rays using STARS and LIBERACE arrays at LBNL cyclotron facility. 153,157Gd; deduced levels, J, π, L-transfers, Nilsson assignments. DWBA analysis of angular distribution data. Comparison with previous experimental results. Discussed residual effects of a neutron subshell closure at N=64.
doi: 10.1103/PhysRevC.90.044323
2013BU05 Phys.Rev. C 87, 044337 (2013), Pub.Note Phys.Rev. C 88, 019903 (2013) M.Bunce, P.H.Regan, V.Werner, C.W.Beausang, V.Anagnostatou, M.Bowry, R.J.Casperson, D.Chen, N.Cooper, P.M.Goddard, R.O.Hughes, G.Ilie, P.J.R.Mason, B.Pauerstein, M.W.Reed, T.J.Ross, E.C.Simpson High-spin study of the shell model nucleus 88Y49 NUCLEAR REACTIONS 74Ge(18O, 3np)60, E=60 MeV; 76Ge(18O, 5np), E=90 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO) using the YRAST ball at WNSL, Yale facility. 88Y; deduced high-spin levels, J, π, bands, configuration. Comparison with truncated valence space shell-model calculations. NUCLEAR STRUCTURE 88Y; calculated levels, J, π, proton occupancy, configuration. Shell model using computer code NUSHELLX.
doi: 10.1103/PhysRevC.87.044337
2013CA05 Phys.Lett. B 721, 51 (2013) R.J.Casperson, V.Werner, S.Heinze Hexadecapole degree of freedom in 94Mo NUCLEAR STRUCTURE 94Mo; calculated energy levels, J, π, B(E4), B(E2), B(M1). g-boson IBM-2 model, comparison with experimental data.
doi: 10.1016/j.physletb.2013.02.042
2013CZ01 Phys.Rev. C 87, 034613 (2013) A.Czeszumska, C.T.Angell, J.T.Burke, N.D.Scielzo, E.B.Norman, R.A.E.Austin, G.Boutoux, R.J.Casperson, P.Chodash, R.O.Hughes, C.M.Mattoon, V.Meot, J.Munson, L.Phair, J.J.Ressler, O.Roig, T.J.Ross, E.Swanberg, B.Wang Determining the 239Np(n, f) cross section using the surrogate ratio method NUCLEAR REACTIONS 236,238U(3He, pF), E=29 MeV; measured proton, deuteron, triton, 3,4He spectra, fission events, fission anisotropies, particle-fission time-to-amplitude spectrum, (fission)p-coin using STARS array at LBNL cyclotron facility. 239Np(n, F), E=0.5-20 MeV; deduced cross section by surrogate ratio method. Comparison with ENDF/B-VII.0, JENDL-4.0, and CENDL-3.1 evaluated libraries. Impact on estimate of 240Pu produced during fuel burnup in calculations using reactor codes.
doi: 10.1103/PhysRevC.87.034613
2013MC07 Phys.Rev. C 87, 057306 (2013) E.A.McCutchan, R.F.Casten, V.Werner, R.J.Casperson, A.Heinz, J.Qian, B.Shoraka, J.R.Terry, E.Williams, R.Winkler β decay spectroscopy of light Nd isotopes RADIOACTIVITY 132,134Pm(β+), (EC)[from 92Mo(46Ti, 3n3p), (46Ti, n3p), E=230 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ) at Yale facility. 132,134Nd; deduced levels, J, π, branching ratio, multipolarity, mixing ratio. Comparison with predictions of X(5) model. Systematics of low-lying levels in 130Ce, 132Nd, and 150Nd.
doi: 10.1103/PhysRevC.87.057306
2013RO23 Phys.Rev. C 88, 031301 (2013) T.J.Ross, R.O.Hughes, C.W.Beausang, J.M.Allmond, C.T.Angell, M.S.Basunia, D.L.Bleuel, J.T.Burke, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.W.Phair, J.J.Ressler, N.D.Scielzo Remnants of spherical shell structures in deformed nuclei: The impact of an N=64 neutron subshell closure on the structure of N≈90 gadolinium nuclei NUCLEAR REACTIONS 154,156,158Gd(p, d), E=25 MeV; measured deuteron and γ spectra, dγ-, γγ-coin, σ(θ) for deuterons using STARS and LIBERACE detector systems at LBNL facility. DWBA analysis of σ(θ) data. 153,155, 157Gd; deduced low-energy levels, J, π, Nilsson configurations, persistence of spherical shell structure.
doi: 10.1103/PhysRevC.88.031301
2013SM02 Phys.Rev. C 87, 044317 (2013) M.K.Smith, V.Werner, J.R.Terry, N.Pietralla, P.Petkov, Z.Berant, R.J.Casperson, A.Heinz, G.Henning, R.Luttke, J.Qian, B.Shoraka, G.Rainovski, E.Williams, R.Winkler Centrifugal stretching from lifetime measurements in the 170Hf ground state band NUCLEAR REACTIONS 124Sn(50Ti, 4n), E=195 MeV; measured Eγ, Iγ, γγ-coin, level-half-lives of ground-state band members by RDDS and DDCM method using the YRAST-Ball array and the New-Yale Plunger device at WNSL facility. 170Hf; deduced levels, B(E2), transition quadrupole moments Qt, centrifugal stretching. Comparison with the rigid rotor, and confined β-soft rotor model.
doi: 10.1103/PhysRevC.87.044317
2012AN17 Appl.Radiat.Isot. 70, 1321 (2012) V.Anagnostatou, P.H.Regan, V.Werner, F.R.Xu, G.X.Dong, M.R.Bunce, D.McCarthy, L.Bettermann, C.Boniwell, R.Casperson, R.Chevrier, N.Cooper, A.Heinz, P.Paurstein, D.Radeck, M.K.Smith, E.Williams Electromagnetic transition rates in 100, 101Pd using the Recoil Doppler Shift Technique NUCLEAR REACTIONS 24Mg(80Se, xn)100Pd/101Pd, E=268 MeV; measured reaction products, Eγ, Iγ; deduced first excited state lifetime, B(E2). RDDS method, comparison with total Routhian surface calculations.
doi: 10.1016/j.apradiso.2011.12.005
2012BU18 J.Phys.:Conf.Ser. 381, 012068 (2012) M.Bunce, P.H.Regan, V.Werner, V.Anagnostatou, C.W.Beausang, M.Bowry, R.J.Casperson, D.Chen, N.Cooper, P.Goddard, R.O.Hughes, G.Ilie, P.J.R.Mason, B.Pauerstein, M.W.Reed, T.J.Ross A shell model study of the high spin states of 88Y NUCLEAR REACTIONS 74Ge(18O, 3np), E=60, 65, 70 MeV;76Ge(18O, 5np), E=90 MeV; measured prompt, delayed Eγ, Iγ(θ), γγ-coin using YRAST ball detector array consisting of 10 Compton-suppressed HPGe and including Doppler shift corrections, γ polarization using Compton polarimeter; calculated σ, σ(l) using PACE4, levels, J, π using NuShell code. 88Y deduced levels, J, π, γ transitions.
doi: 10.1088/1742-6596/381/1/012068
2012HU01 Phys.Rev. C 85, 024613 (2012) R.O.Hughes, C.W.Beausang, T.J.Ross, J.T.Burke, N.D.Scielzo, M.S.Basunia, C.M.Campbell, R.J.Casperson, H.L.Crawford, J.E.Escher, J.Munson, L.W.Phair, J.J.Ressler Utilizing (p, d) and (p, t) reactions to obtain (n, f) cross sections in uranium nuclei via the surrogate-ratio method NUCLEAR REACTIONS 236,238U(p, d), (p, t), E=28 MeV; measured E(d), I(d), E(t), I(t), fission spectra, (particle)(fission)-, (particle)γ-coin, fission fragment anisotropy ratios using STARS detector array at LBNL cyclotron facility; deduced σ[236U(n, F)]/σ[234U(n, F)], σ[235U(n, F)]/σ[233U(n, F)], σ[234U(n, F)]/σ[233U(n, F)], σ[236U(n, F)]/σ[235U(n, F)] reaction cross section ratios for E(n)=0-7 MeV. Surrogate-ratio method. Comparison with ENDF/B-VII evaluation.
doi: 10.1103/PhysRevC.85.024613
2012HU14 J.Phys.:Conf.Ser. 381, 012064 (2012) R.O.Hughes, C.W.Beausang, T.J.Ross, J.T.Burke, N.D.Scielzo, M.S.Basunia, C.M.Campbell, R.J.Casperson, H.L.Crawford, J.Munson, L.Phair, J.J.Ressler To the continuum and beyond: Structure of U nuclei NUCLEAR REACTIONS 236,238U(p, X), E=28 MeV; measured outgoing light ions using STARS Si telescope, (particle)(fission)-coin, Eγ, Iγ using Ge detectors of LIBERACE array, (particle)γ-coin; deduced σ(234U(n, f))/σ(236U(n, f)) ratio vs neutron energy using (p, dF) surrogate. 235,237U deduced levels, J, π, γ transitions.
doi: 10.1088/1742-6596/381/1/012064
2012LU03 Phys.Rev. C 85, 017301 (2012) R.Luttke, E.A.McCutchan, V.Werner, K.Aleksandrova, S.Atwater, H.Ai, R.J.Casperson, R.F.Casten, A.Heinz, A.F.Mertz, J.Qian, B.Shoraka, J.R.Terry, E.Williams, R.Winkler Collectivity in 66Ge and 68Ge via lifetime measurements NUCLEAR REACTIONS 58Ni(10B, pn), E=28 MeV; 58Ni(12C, 2p), E=38 MeV; measured Eγ, half-lives of first 2+ states by recoil-distance Doppler shift using a plunger device and SPEEDY array at WNSL, Yale. 66,68Ge; deduced level, B(E2). Comparison with large-scale shell-model calculations.
doi: 10.1103/PhysRevC.85.017301
2012RA03 Phys.Rev. C 85, 014301 (2012) D.Radeck, V.Werner, G.Ilie, N.Cooper, V.Anagnostatou, T.Ahn, L.Bettermann, R.J.Casperson, R.Chevrier, A.Heinz, J.Jolie, D.McCarthy, M.K.Smith, E.Williams Simultaneous deorientation and lifetime measurement in 98Ru using the recoil distance Doppler shift method in inverse Coulomb excitation NUCLEAR REACTIONS 24Mg(98Ru, 98Ru'), E=300 MeV; measured Eγ, Iγ, particle spectra, angular distribution and deorientation, particle-γ coin, half-lives of first 2+ and 4+ states by Recoil distance Doppler shift (RDDS) method using New Yale Plunger Device and YRAST ball array. Coulomb excitation in inverse kinematics. 98Ru; deduced levels, B(E2) values. Comparison with theoretical calculations and previous works, systematics of B(E2) values for first 2+ and 4+ states in A=96-122 (even) Ru, and N=54, Z=40-48 (even) nuclei.
doi: 10.1103/PhysRevC.85.014301
2012RO14 Phys.Rev. C 85, 051304 (2012) T.J.Ross, C.W.Beausang, R.O.Hughes, J.M.Allmond, C.T.Angell, M.S.Basunia, D.L.Bleuel, J.T.Burke, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.Phair, J.J.Ressler, N.D.Scielzo, I.J.Thompson Measurement of the entry-spin distribution imparted to the high excitation continuum region of gadolinium nuclei via (p, d) and (p, t) reactions NUCLEAR REACTIONS 154,158Gd(p, d), (p, t), E=25 MeV; measured particle and γ spectra, pγ-, dγ-, tγ-coin, σ(θ) using STARS-LIBERACE array; deduced entry spin distribution for the highly excited quasicontinuum in light-ion transfer reactions. DWBA analysis of σ(θ) data. 153,156Gd; deduced levels, J, π, l-transfer.
doi: 10.1103/PhysRevC.85.051304
2012RO42 Phys.Rev. C 86, 067301 (2012) T.J.Ross, C.W.Beausang, R.O.Hughes, N.D.Scielzo, J.T.Burke, J.M.Allmond, C.T.Angell, M.S.Basunia, D.L.Bleuel, R.J.Casperson, J.E.Escher, P.Fallon, R.Hatarik, J.Munson, S.Paschalis, M.Petri, L.Phair, J.J.Ressler Spectroscopy of 88Y by the (p, dγ) reaction NUCLEAR REACTIONS 89Y(p, d), E=25 MeV; measured E(d), I(d), Eγ, Iγ, dγ-coin, yields using STARS array for deuterons and LIBERACE array for γ rays at LBNL cyclotron facility. 88Y; deduced levels, branching ratios. 89Y(p, p'), (p, p'n), E=25 MeV; measured Ep, Ip, pγ-coin.
doi: 10.1103/PhysRevC.86.067301
2012WE13 J.Phys.:Conf.Ser. 366, 012048 (2012) V.Werner, G.Ilie, D.Radeck, T.Ahn, C.W.Beausang, L.Bettermann, R.J.Casperson, R.Chevrier, N.Cooper, T.C.Bonniwell, A.Heinz, E.Holland, D.McCarthy, B.Pauerstein, M.K.Smith, J.R.Terry, E.Williams Lifetime and magnetic moment measurements NUCLEAR REACTIONS 24Mg(104Pd, 104Pd'), (106Pd, 106Pd'), (108Pd, 108Pd'), E=324, 330, 336 MeV; measured Coulomb excitation Eγ, Iγ using g-Plunger technique; deduced g-factor, T1/2. Compared with NNDC data.
doi: 10.1088/1742-6596/366/1/012048
2012WO03 Phys.Rev. C 85, 037304 (2012);Erratum Phys.Rev. C 86, 019902 (2012) A.Wolf, Z.Berant, V.Werner, A.Heinz, R.F.Casten, R.J.Casperson, D.S.Brenner, R.Chevrier, D.McCarthy, G.Ilie, E.Williams, J.Qian, J.R.Terry, T.Ahn, R.Winkler g factor of the 21+ state of 168Hf NUCLEAR MOMENTS 168Hf; measured g factor by perturbed angular correlation in a static external magnetic field. Comparisons with hydrodynamic model, semiempirical model, IBA-2 model, large-scale shell-model, pairing plus quadrupole model. Systematics of g factors of first 2+ states for 96,98,100,104,106,108Hf. RADIOACTIVITY 168Ta(EC), (β+)[from 159Tb(16O, 7n), E=130 MeV]; measured Eγ, γγ-coin, perturbed γγ(θ) in a magnetic field; deduced g factor.
doi: 10.1103/PhysRevC.85.037304
2011AN04 Acta Phys.Pol. B42, 807 (2011) V.Anagnostatou, P.H.Regan, M.R.Bunce, D.McCarthy, V.Werner, T.Ahn, R.J.Casperson, R.Chevrier, N.Cooper, A.Heinz, G.Ilie, M.K.Smith, E.Williams, L.Bettermann, D.Radeck, C.W.Beausang, C.Boniwell, B.Pauerstein Measurements of Picosecond Lifetimes in the Transitional Nucleus 100Pd Using the RDDM in Inverse Kinematics NUCLEAR REACTIONS 24Mg(80Se, 4n)100Pd, E=268 MeV; measured fusion-evaporation products, Eγ, Iγ; deduced weak deformation, energies, J, π, B(E2), yrast sequence.
doi: 10.5506/APhysPolB.42.807
2011MC01 Phys.Rev. C 83, 024310 (2011) E.A.McCutchan, C.J.Lister, T.Ahn, R.J.Casperson, A.Heinz, G.Ilie, J.Qian, E.Williams, R.Winkler, V.Werner Shape coexistence in 72Se investigated following the β decay of 72Br RADIOACTIVITY 72Br(β+), (EC)[from 58Ni(16O, pn), E=50 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ) using YRAST array. 72Se; deduced levels, J, π, multipolarity, mixing ratio, β feedings, B(E2) strengths. Comparison with interacting boson model. Evidence of shape coexistence and configuration mixings.
doi: 10.1103/PhysRevC.83.024310
2011RE09 Phys.Rev. C 83, 054610 (2011) J.J.Ressler, J.T.Burke, J.E.Escher, C.T.Angell, M.S.Basunia, C.W.Beausang, L.A.Bernstein, D.L.Bleuel, R.J.Casperson, B.L.Goldblum, J.Gostic, R.Hatarik, R.Henderson, R.O.Hughes, J.Munson, L.W.Phair, T.J.Ross, N.D.Scielzo, E.Swanberg, I.J.Thompson, M.Wiedeking Surrogate measurement of the 238Pu(n, f) cross section NUCLEAR REACTIONS 239Pu(α, α'F), 235U(α, α'F), 236U(α, α'F), E=20-55 MeV; measured particle and fission fragment spectra, α-fission coincidences, cross sections, fission fragment anisotropy ratios. 238Pu, 234,235U(n, F), E=5-20 MeV; deduced fission cross sections using surrogate ratio method. Comparison with previous experimental data and evaluated libraries. Data needs for following reactions for next-generation reactors: 241Pu, 241,242Am, 243,244,245Cm(n, F), E.1 MeV. Potential surrogate and ratio reactions listed.
doi: 10.1103/PhysRevC.83.054610
2011TA06 Phys.Rev. C 83, 044315 (2011) M.J.Taylor, G.Gurdal, G.Kumbartzki, N.Benczer-Koller, A.E.Stuchbery, Y.Y.Sharon, M.A.Bentley, Z.Berant, R.J.Casperson, R.F.Casten, A.Heinz, G.Ilie, R.Luttke, E.A.McCutchan, J.Qian, B.Shoraka, V.Werner, E.Williams, R.Winkler Low-energy structure of the even-A 96-104Ru isotopes via g-factor measurements NUCLEAR MOMENTS 96,98,100,102,104Ru, 106Pd; measured g factors of first 2+ states by transient-field-perturbed angular correlation technique used with Coulomb excitation in inverse kinematics. Comparison with IBM-2 calculations. NUCLEAR REACTIONS 12C(96Ru, 96Ru'), (98Ru, 98Ru'), (100Ru, 100Ru'), (102Ru, 102Ru'), (104Ru, 104Ru'), (106Pd, 106Pd'), E=280 MeV; 12C(102Ru, 102Ru'), E=160, 227 MeV; 12C(106Pd, 106Pd'), E=230 MeV; 24Mg(102Ru, 102Ru'), E=227 MeV; 26Mg(96Ru, 96Ru'), (98Ru, 98Ru'), E=230 MeV; 26Mg(100Ru, 100Ru'), (102Ru, 102Ru'), (104Ru, 104Ru'), E=227 MeV; measured (particle)γ-coin spectra, (particle)γ(θ), precession angles; deduced transient field strengths, g factors. Coulomb excitation in inverse kinematics.
doi: 10.1103/PhysRevC.83.044315
2010BE03 Phys.Rev. C 81, 021303 (2010) L.Bettermann, V.Werner, E.Williams, R.J.Casperson New signature of a first order phase transition at the O(6) limit of the IBM NUCLEAR STRUCTURE 192,194,196,198Pt; calculated order parameter K3 for ground state and first excited 0+ state using interacting boson model (IBM). Comparison with experimental data.
doi: 10.1103/PhysRevC.81.021303
2010GU20 Phys.Rev. C 82, 064301 (2010) G.Gurdal, G.J.Kumbartzki, N.Benczer-Koller, Y.Y.Sharon, L.Zamick, S.J.Q.Robinson, T.Ahn, R.Casperson, A.Heinz, G.Ilie, J.Qian, V.Werner, E.Williams, R.Winkler, D.McCarthey g factors of the low-lying states in 106Pd: Examination of the vibrational character of 106Pd NUCLEAR MOMENTS 106Pd; measured g factors and half-lives of low lying 2+ and 4+ states using transient field (TF) technique in inverse kinematics in Coulomb excitation. Comparison with previous measurements and theoretical predictions. NUCLEAR REACTIONS C(106Pd, C'), E=230, 280, 290, 300 MeV; measured scattered C ions, Eγ, Iγ, γ(θ, H), (12C)γ-coin, level half-lives by line-shape method. 106Pd; deduced g factors, B(E2) values.
doi: 10.1103/PhysRevC.82.064301
2010SO03 Phys.Rev. C 81, 034310 (2010) P.-A.Soderstrom, J.Nyberg, P.H.Regan, A.Algora, G.de Angelis, S.F.Ashley, S.Aydin, D.Bazzacco, R.J.Casperson, W.N.Catford, J.Cederkall, R.Chapman, L.Corradi, C.Fahlander, E.Farnea, E.Fioretto, S.J.Freeman, A.Gadea, W.Gelletly, A.Gottardo, E.Grodner, C.Y.He, G.A.Jones, K.Keyes, M.Labiche, X.Liang, Z.Liu, S.Lunardi, N.Marginean, P.Mason, R.Menegazzo, D.Mengoni, G.Montagnoli, D.Napoli, J.Ollier, S.Pietri, Zs.Podolyak, G.Pollarolo, F.Recchia, E.Sahin, F.Scarlassara, R.Silvestri, J.F.Smith, K.-M.Spohr, S.J.Steer, A.M.Stefanini, S.Szilner, N.J.Thompson, G.M.Tveten, C.A.Ur, J.J.Valiente-Dobon, V.Werner, S.J.Williams, F.R.Xu, J.Y.Zhu Spectroscopy of neutron-rich 168, 170Dy: Yrast band evolution close to the NpNn valence maximum NUCLEAR REACTIONS 170Er(82Se, X)168Dy/170Dy, E=460 MeV; measured mass yields, distributions of product nuclei using PRISMA spectrometer, Eγ, Iγ, γγ-, (particle)γ-coin using CLARA HPGe array. 168Dy; deduced levels, J, π, rotational bands, moments of inertia. 170Dy; deduced 4+ to 2+ transition. 170Er; measured Eγ. Z=64-72, N=94-108; systematics of levels and moments of inertia for even-even isotopes, and total Routhian surface calculations. 81,82,83,84,85,86,87,88,89,90Kr, 162,163,164,165,166,167,168,169,170,171Dy; measured yields of complementary beam-like and target-like fragments through 2pxn channels.
doi: 10.1103/PhysRevC.81.034310
2010WI05 Phys.Rev. C 81, 054306 (2010) E.Williams, R.J.Casperson, V.Werner Scaling properties of quantum shape phase transitions in the interacting boson model-1
doi: 10.1103/PhysRevC.81.054306
2010WI12 Phys.Rev. C 82, 054308 (2010) E.Williams, R.J.Casperson, V.Werner Effective critical points in finite quantum phase transitional systems
doi: 10.1103/PhysRevC.82.054308
2009BE42 Phys.Rev. C 80, 057303 (2009) Z.Berant, E.Oster, R.J.Casperson, A.Wolf, V.Werner, A.Heinz, R.F.Casten, G.Gurdal, E.A.McCutchan, D.S.Brenner, J.R.Terry, R.Winkler, E.Williams, J.Qian, A.Schmidt, M.K.Smith, T.Ahn, C.W.Beausang, P.H.Regan, T.Ross, M.Bunce, B.Darakchieva, D.A.Meyer, J.LeBlanc, K.Dudziak, C.Bauer, G.Henning g factor of the 2+1 state of 172Hf NUCLEAR MOMENTS 172Hf; measured g factor of first 2+ state using integral perturbed angular correlation method. Comparisons with g factors of neighboring even-even Hf nuclei and with predictions of several nuclear models including interacting boson approximation (IBA-2). RADIOACTIVITY 172Ta(EC), (β+) [from 165Ho(12C, 5n), E=85 MeV]; measured Eγ, Iγ, γγ-coin, and cascade Iγ as a function of angle and magnetic field.
doi: 10.1103/PhysRevC.80.057303
2009BO23 Phys.Rev. C 80, 034311 (2009); Erratum Phys.Rev. C 80, 049902 (2009) D.Bonatsos, E.A.McCutchan, R.F.Casten, R.J.Casperson, V.Werner, E.Williams Regularities and symmetries of subsets of collective 0+ states
doi: 10.1103/PhysRevC.80.034311
2009MU06 Phys.Rev. C 79, 054310 (2009) D.Mucher, G.Gurdal, K.-H.Speidel, G.J.Kumbartzki, N.Benczer-Koller, S.J.Q.Robinson, Y.Y.Sharon, L.Zamick, A.F.Lisetskiy, R.J.Casperson, A.Heinz, B.Krieger, J.Leske, P.Maier-Komor, V.Werner, E.Williams, R.Winkler Nuclear structure studies of 70Zn from g-factor and lifetime measurements NUCLEAR REACTIONS 12C(70Zn, X), E=180-200 MeV; measured Eγ, Iγ, γγ-coin, (particle)γ-coin, γγ(θ), half-lives and spin precessions in a magnetic field. 70Zn; deduced levels, J, π. Comparison with large-scale shell-model calculations. NUCLEAR MOMENTS 70Zn; measured g factors by projectile Coulomb excitation in inverse kinematics combined with transient magnetic field. Comparison with shell-model calculations.
doi: 10.1103/PhysRevC.79.054310
2009WI18 Phys.Rev. C 80, 054309 (2009) E.Williams, R.J.Casperson, V.Werner, H.Ai, P.Boutachkov, M.Chamberlain, G.Gurdal, A.Heinz, E.A.McCutchan, J.Qian, R.Winkler Candidates for low-lying mixed-symmetry states in 140Nd RADIOACTIVITY 140Pm(β+), (β+EC) [from 140Sm(β+), (β+EC), from 114Cd(30Si, 4n), E=130 MeV]; measured Eγ, Iγ, γγ-coin, and γγ(θ) using Yrast ball. 140Nd; deduced levels, J, π, and mixing ratios. Low-lying mixed-symmetry states discussed. Comparisons with level systematics of 136Ba and 138Ce.
doi: 10.1103/PhysRevC.80.054309
2008BO13 Phys.Rev.Lett. 100, 142501 (2008) D.Bonatsos, E.A.McCutchan, R.F.Casten, R.J.Casperson Simple Empirical Order Parameter for a First-Order Quantum Phase Transition in Atomic Nuclei
doi: 10.1103/PhysRevLett.100.142501
2008MC01 Phys.Rev. C 77, 054304 (2008) E.A.McCutchan, R.F.Casten, V.Werner, E.Williams, R.Winkler, A.Wolf, Z.Berant, G.Gurdal, J.Qian, H.Ai, L.Amon, C.W.Beausang, D.S.Brenner, R.B.Cakirli, R.J.Casperson, C.R.Fitzpatrick, D.Frank, A.B.Garnsworthy, A.Heinz, R.Luttke, A.F.Mertz, Y.Oktem, N.Pietralla, P.H.Regan, B.Shoraka, J.R.Terry, N.J.Thompson Enhanced mixing of intrinsic states in deformed Hf nuclei RADIOACTIVITY 170,172,174Ta(β+), (EC) [from 159Tb(16O, 5n), E=100 MeV; 165Ho(12C, 5n), E=80 MeV; 168Er(11B, 5n), E=65 MeV]; measured Eγ, Iγ, γγ-coin, branching ratios. 170,172,174Hf; deduced levels, J, π. 166,168,170,172,174Hf; systematics.
doi: 10.1103/PhysRevC.77.054304
2008ME02 Phys.Rev. C 77, 014307 (2008) A.F.Mertz, E.A.McCutchan, R.F.Casten, R.J.Casperson, A.Heinz, B.Huber, R.Luttke, J.Qian, B.Shoraka, J.R.Terry, V.Werner, E.Williams, R.Winkler First experimental test of X(5) critical-point symmetry in the A ∼ 130 mass region: Low-spin states and the collective structure of 130Ce RADIOACTIVITY 130Pr(β+)(EC) [from 107Ag(27Al, p3n), E=113 MeV]; measured Eγ, Iγ, γγ-coin. 130Ce; deduced levels, J, π, B(E2), comparison with calculations using X(5) and IBA models.
doi: 10.1103/PhysRevC.77.014307
2008WE07 Phys.Rev. C 78, 031301 (2008) V.Werner, N.Benczer-Koller, G.Kumbartzki, J.D.Holt, P.Boutachkov, E.Stefanova, M.Perry, N.Pietralla, H.Ai, K.Aleksandrova, G.Anderson, R.B.Cakirli, R.J.Casperson, R.F.Casten, M.Chamberlain, C.Copos, B.Darakchieva, S.Eckel, M.Evtimova, C.R.Fitzpatrick, A.B.Garnsworthy, G.Gurdal, A.Heinz, D.Kovacheva, C.Lambie-Hanson, X.Liang, P.Manchev, E.A.McCutchan, D.A.Meyer, J.Qian, A.Schmidt, N.J.Thompson, E.Williams, R.Winkler Evidence for the microscopic formation of mixed-symmetry states from magnetic moment measurements NUCLEAR REACTIONS C(92Zr, 92Zr'), (94Zr, 94Zr'), E=275 MeV; measured Eγ, Iγ, (particle)γ-coin. Comparison with shell model and quasiparticle phonon model calculations. NUCLEAR MOMENTS C(92Zr, 92Zr'), (94Zr, 94Zr'), E=275 MeV; 92,94Zr; measured g factors. Transient field technique.
doi: 10.1103/PhysRevC.78.031301
2008WE09 Phys.Rev. C 78, 051303 (2008) V.Werner, E.Williams, R.J.Casperson, R.F.Casten, C.Scholl, P.von Brentano Deformation crossing near the first-order shape-phase transition in 152-156Gd NUCLEAR STRUCTURE 152,154,156Gd; analyzed B(E2) values; deduced quadrupole shape invariant, spherical-to-deformed phase transitions. Comparisons with Interacting Boson Model.
doi: 10.1103/PhysRevC.78.051303
2008WI06 Phys.Rev. C 77, 061302 (2008) E.Williams, R.J.Casperson, V.Werner Spin dependence of critical point behavior for first and second order phase transitions in nuclei
doi: 10.1103/PhysRevC.77.061302
2007MC08 Phys.Rev. C 76, 064307 (2007) E.A.McCutchan, R.F.Casten, V.Werner, A.Wolf, Z.Berant, R.J.Casperson, A.Heinz, R.Luttke, B.Shoraka, J.R.Terry, E.Williams, R.Winkler β decay study of 168Hf and a test of new geometrical models RADIOACTIVITY 168Ta (β+), (EC) [from 159Tb(16O, 7n), E=130 MeV]; measured Eγ, Iγ, γγ-coin, γγ(θ). 168Hf; deduced levels, J, π, multipolarities, mixing ratios, B(E2). Compared with calculations using CBS and Davidson models and IBA model. 166,168Yb; measured Eγ.
doi: 10.1103/PhysRevC.76.064307
2007WO08 Phys.Rev. C 76, 047308 (2007) A.Wolf, Z.Berant, A.Heinz, V.Werner, E.A.McCutchan, G.Gurdal, R.B.Cakirli, Y.Oktem, J.Ai, L.Amon, C.W.Beausang, D.S.Brenner, R.F.Casten, R.J.Casperson, K.Dusling, C.R.Fitzpatrick, A.B.Gransworthy, N.Pietralla, J.Qian, P.H.Regan, N.J.Thompson, E.Williams, R.Winkler g factor of the 2+1 state of 170Hf RADIOACTIVITY 170Ta(β+), (EC) [from 159Tb(16O, 5n), E=100 MeV]; measured Eγ, Iγ, γγ(θ) in static magnetic field. 170Hf; deduced levels, J, π, g-factor of first 2+ state.
doi: 10.1103/PhysRevC.76.047308
2006OK04 Phys.Rev. C 74, 027304 (2006) Y.Oktem, R.B.Cakirli, R.F.Casten, R.J.Casperson, D.S.Brenner Simple interpretation of proton-neutron interactions in rare earth nuclei NUCLEAR STRUCTURE 156,158,160Gd, 158,160,162,164Dy, 162,164,166,168,170Er, 166,168,170,172,174Yb, 170,172,174,176,178,180Hf, 176,178,180,182W; analyzed proton-neutron interaction data; deduced systematic features.
doi: 10.1103/PhysRevC.74.027304
2006RI11 Phys.Rev. C 74, 044302 (2006) M.G.Rios, R.J.Casperson, K.S.Krane, E.B.Norman Neutron capture cross sections of 148Gd and the decay of 149Gd NUCLEAR REACTIONS 148Gd(n, γ), E=thermal; measured capture σ, resonance integral. RADIOACTIVITY 149Gd(EC), (β+) [from 148Gd(n, γ)]; measured Eγ, Iγ. 149Eu deduced levels, J, π. Comparison with previous results.
doi: 10.1103/PhysRevC.74.044302
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