NSR Query Results
Output year order : Descending NSR database version of March 18, 2024. Search: Author = A.Aprahamian Found 139 matches. Showing 1 to 100. [Next]2023AP03 Eur.Phys.J. A 59, 274 (2023) A.Aprahamian, K.Lee, S.R.Lesher Franz Kappeler and evolutions in nuclear physics
doi: 10.1140/epja/s10050-023-01193-3
2023DE34 Nucl.Instrum.Methods Phys.Res. A1055, 168472 (2023) S.Dede, S.D.Essenmacher, P.Gastis, K.V.Manukyan, S.A.Kuvin, H.Y.Lee, J.M.Roach, P.C.Burns, A.Aprahamian Electrospraying deposition and characterization of potassium chloride targets for nuclear science measurements NUCLEAR REACTIONS 35Cl, 39K(n, p), E=3-3.5 MeV; measured reaction products, Ep, Ip; deduced Q-values, ratio of partial σ. A white neutron beam at the Los Alamos Neutron Science Center (LANSCE) facility.
doi: 10.1016/j.nima.2023.168472
2022FR09 Phys.Rev. C 106, 065803 (2022) B.Frentz, A.Aprahamian, A.Boeltzig, T.Borgwardt, A.M.Clark, R.J.deBoer, G.Gilardy, J.Gorres, M.Hanhardt, S.L.Henderson, K.B.Howard, T.Kadlecek, Q.Liu, K.T.Macon, S.Moylan, C.S.Reingold, D.Robertson, C.Seymour, S.Y.Strauss, F.Strieder, B.Vande Kolk, M.Wiescher Investigation of the 14N(p, γ)15O reaction and its impact on the CNO cycle NUCLEAR REACTIONS 14N(p, γ), E=0.27-1.07 MeV; measured Eγ, Iγ; deduced σ(θ, E) for particular transitions in daughter nuclei, astrophysical differential and total S-factor, astrophysical reaction rate for T=0.01-10 GK. Multichannel R-matrix analysis for the transition to the ground state, the excited states at 6.17 and 6.79 MeV, as well as 14N(p, p) differential scattering data. Discussed implication of the obtained data on the CNO neutrino production. Comparison to other experimental results. Single coaxial HPGe detector. Beam from 1 MV JN Van de Graaff at the Compact Accelerator System for Performing Astrophysical Research (CASPAR) at the Sanford Underground Research Facility.
doi: 10.1103/PhysRevC.106.065803
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
2022LE11 Phys.Rev. C 106, 044302 (2022) S.R.Lesher, A.Aprahamian, K.Lee, B.Alemayehu, L.M.Clark, X.James, J.C.T.Lowrie, M.Meier, L.McEwan, S.Mukhopadhyay, E.E.Peters, A.P.D.Ramirez, M.Ryan, B.G.Rice, A.Stratman, E.Temanson, J.R.Vanhoy, S.W.Yates Lifetime measurements of 0+ states in 168Er with the Doppler-shift attenuation method NUCLEAR REACTIONS 168Er(n, n'γ), E=1.2-3.0 MeV in 0.1 MeV steps; measured Eγ, Iγ, excitation functions, γ(θ), level T1/2 by Doppler-shift attenuation method (DSAM) at the University of Kentucky Accelerator Laboratory. 168Er; deduced levels, J, π, excited 0+ states, bands, multipole mixing ratios, B(E2), B(E1). Comparison with previous experimental results, and with evaluated data in the ENSDF database. Systematics of low-lying levels and B(E2) values in 162,164,166,168,170Er.
doi: 10.1103/PhysRevC.106.044302
2021CO05 Rev.Mod.Phys. 93, 015002 (2021) J.J.Cowan, C.Sneden, J.E.Lawler, A.Aprahamian, M.Wiescher, K.Langanke, G.Martinez-Pinedo, F.-K.Thielemann Origin of the heaviest elements: The rapid neutron-capture process
doi: 10.1103/RevModPhys.93.015002
2021FR05 Phys.Rev. C 103, 045802 (2021) B.Frentz, A.Aprahamian, A.M.Clark, R.J.deBoer, C.Dulal, J.D.Enright, J.Gorres, S.L.Henderson, J.D.Hinnefeld, K.B.Howard, R.Kelmar, K.Lee, L.Morales, S.Moylan, Z.Rahman, W.Tan, L.E.Weghorn, M.Wiescher Lifetime measurements of excited states in 15O NUCLEAR REACTIONS 14N(p, γ)15O, E=1020, 1570 keV; measured Eγ, Iγ, half-lives of 5.18-, 6.17- and 6.79-MeV levels in 15O by Doppler-shift attenuation method (DSAM) using three separate, nitrogen-implanted targets with Mo, Ta, and W backings at the Nuclear Science Laboratory (NSL) of University of Notre Dame. Comparison with previous half-life measurements. Monte Carlo simulations of Doppler-shift attenuation factors. R-matrix analysis of asymptotic normalization constants (ANCs) and radiative widths Γγ using AZURE2 code for g.s. and levels between 6793 and 9609 keV, including half-lives measured in the present work and experimental data in literature. Relevance to CNO chain of reactions and uncertainty in the 14N(p, γ)15O reaction rate.
doi: 10.1103/PhysRevC.103.045802
2021SE17 Phys.Rev. C 104, 024317 (2021) S.Sekal, L.M.Fraile, R.Lica, M.J.G.Borge, W.B.Walters, A.Aprahamian, C.Benchouk, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, D.G.Ghita, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, H.Mach, N.Marginean, R.Marginean, Z.Meliani, B.Olaizola, V.Paziy, J.M.Regis, M.Rudigier, T.Sava, G.S.Simpson, M.Stanoiu, L.Stroe Low-spin states in 80Ge populated in the β decay of the 80Ga 3- isomer RADIOACTIVITY 80mGa(β-)[from decay of 80Zn produced in U(n, F), E=fast neutrons at the ISOLDE-CERN facility, followed by separation of fission fragments passed using the ISOLDE Resonance Ionization Laser Ion Source (RILIS) and high-resolution magnetic separator]; measured Eγ, Iγ, βγ- and γγ-coin using two HPGe detectors for γ rays and an NE111A organic plastic scintillator for β detection. 80Ge; deduced levels, J, π, β feedings, logft. Comparison with previous experimental results, and with shell-model and IBM calculations. NUCLEAR STRUCTURE 70,72,74,76,78,80,82Ge, 82Se, 84Kr, 86Sr, 88Zr, 90Mo; calculated energies of second 0+ states by shell-model using Antoine code with JUN45 interaction, and NUSHELLX@MSU code with jj44bpn interaction, and IBM-1, IBM-2 models, and comparison with experimental values; Systematics of low-lying positive-parity levels up to 8+.
doi: 10.1103/PhysRevC.104.024317
2021WI11 Nucl.Instrum.Methods Phys.Res. A1017, 165806 (2021) G.L.Wilson, T.S.Nagel, S.T.Marley, N.D.Scielzo, A.Aprahamian, J.A.Clark, A.Czeszumska, G.Savard, K.Siegl, B.S.Wang Reconstruction of β-delayed neutron energy spectra from recoil-ion spectroscopy of trapped ions RADIOACTIVITY 137I, 99Y, 135Sb(β-n); calculated neutron-energy spectrum and the probability of β-delayed neutron emission.
doi: 10.1016/j.nima.2021.165806
2020CZ01 Phys.Rev. C 101, 024312 (2020) A.Czeszumska, N.D.Scielzo, S.A.Caldwell, J.A.Clark, G.Savard, B.S.Wang, A.Aprahamian, M.T.Burkey, C.J.Chiara, J.Harker, A.F.Levand, S.T.Marley, G.Morgan, J.M.Munson, E.B.Norman, A.Nystrom, R.Orford, S.W.Padgett, A.Perez Galvan, K.S.Sharma, K.Siegl, S.Y.Strauss β-delayed neutron emission studies of 137,138I and 144,145Cs performed with trapped ions RADIOACTIVITY 137,138I, 144,145Cs(β-), (β-n)[252Cf(SF) CARIBU facility and mass scans of radioactive beams with the Canadian Penning Trap (CPT) mass spectrometer at Argonne National Laboratory]; measured recoil ions, Eβ, Eγ, (recoil ions)β- and βγ-coin using Beta-decay Paul Trap with two plastic-scintillator ΔE-E telescopes, two MCP detectors, and two HPGe detectors; deduced beta-delayed neutron spectra, beta-delayed neutron-emission probabilities (%β-n or Pn). Comparison with previous experimental results.
doi: 10.1103/PhysRevC.101.024312
2020HU10 Phys.Rev. C 102, 014615 (2020) C.Hunt, G.V.Rogachev, S.Almaraz-Calderon, A.Aprahamian, M.Avila, L.T.Baby, B.Bucher, V.Z.Goldberg, E.D.Johnson, K.W.Kemper, A.N.Kuchera, W.P.Tan, I.Wiedenhover Observation of T = 3/2 isobaric analog states in 9Be using p + 8Li resonance scattering NUCLEAR REACTIONS 1H(8Li, 8Li), E(cm)=1.46-2.3 MeV, [secondary 8Li radioactive beam from 2H(7Li, 8Li), E=23.5, 27 MeV primary reaction]; measured energies of light and heavy recoils, (light recoils)(heavy recoils)-coin, differential σ(θ, E) using two annular Silicon strip detectors at RESOLUT radioactive nuclear beam facility of the FSU John D. Fox Superconducting Accelerator Laboratory. 9Be; deduced resonances J, π, width, T=3/2 IAS, spectroscopic factors from R-matrix analysis using MINRMATRIX code. Discussed isomirror properties for the T=3/2 A=9 isoquartet. Relevance to study of the structure of neutron-rich exotic nuclei through IAS.
doi: 10.1103/PhysRevC.102.014615
2020OR02 Nucl.Instrum.Methods Phys.Res. B463, 491 (2020) R.Orford, J.A.Clark, G.Savard, A.Aprahamian, F.Buchinger, M.T.Burkey, D.A.Gorelov, J.W.Klimes, G.E.Morgan, A.Nystrom, W.S.Porter, D.Ray, K.S.Sharma Improving the measurement sensitivity of the Canadian Penning Trap mass spectrometer through PI-ICR ATOMIC MASSES 142I, 146La, 163Gd; measured frequencies; deduced mass excesses.
doi: 10.1016/j.nimb.2019.04.016
2020PA26 Phys.Rev. C 102, 014329 (2020) V.Paziy, L.M.Fraile, H.Mach, B.Olaizola, G.S.Simpson, A.Aprahamian, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, D.Ghita, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, R.Lica, N.Marginean, R.Marginean, J.-M.Regis, M.Rudigier, T.Sava, M.Stanoiu, L.Stroe, W.B.Walters Fast-timing study of 81Ga from the β decay of 81Zn RADIOACTIVITY 81Zn(β-), (β-n)[from U(p, F), E=1.4 GeV at CERN PS-Booster (PSB) facility, followed by separation of ionized nuclei using the ISOLDE-RILIS]; measured Eγ, Iγ, b-, βγ- and γγ-coin, half-life of 81Zn decay, level half-lives by βγγ(t) fast-timing technique, β-delayed neutron branching ratio or Pn using HPGe and LaBr3 detectors for γ detection and a plastic scintillator for β detection at CERN-ISOLDE. 80,81Ga(β-); measured half-lives of 80Ga and 81Ga decays. 80,81Ga; deduced levels, J, π, Iβ, logft, B(M1), and B(E2). Comparison with large-scale shell model calculations using the NuShellX@MSU and ANTOINE codes with JUN45 and jj44b interactions. Systematics of low-lying levels in 71,73,75,77,79,81Ga, 79Cu, 83As, 85Br, 87Rb. 81Zn; discussed spin, parity and configuration of the ground state.
doi: 10.1103/PhysRevC.102.014329
2020VI04 Phys.Rev. C 101, 034312 (2020) M.Vilen, J.M.Kelly, A.Kankainen, M.Brodeur, A.Aprahamian, L.Canete, R.P.de Groote, A.de Roubin, T.Eronen, A.Jokinen, I.D.Moore, M.R.Mumpower, D.A.Nesterenko, J.O'Brien, A.Pardo Perdomo, H.Penttila, M.Reponen, S.Rinta-Antila, R.Surman Exploring the mass surface near the rare-earth abundance peak via precision mass measurements at JYFLTRAP ATOMIC MASSES 154Nd, 161Pm, 163Sm, 162,162m,163,164,165Eu, 163,163m,167Gd, 165,166,167,168Tb; measured time-of-flight ion-cyclotron-resonances (TOF-ICR) and phase-imaging ion-cyclotron-resonances (PI-ICR), frequency ratios, mass excesses using the JYFLTRAP double penning trap at the IGISOL facility of University of Jyvaskyla; deduced S(n), S(2n), pairing-gap energies, and average proton neutron interaction of valence nucleons. 162mEu, 163mGd; deduced absolute energies of the isomers. Comparison with previous experimental measurements, and with evaluated data in AME2016. Isotopes formed in U(p, F), E=25 MeV reaction. Discussed impact on solar r-process abundances as a function of the mass number.
doi: 10.1103/PhysRevC.101.034312
2020WA04 Phys.Rev. C 101, 025806 (2020) B.S.Wang, S.A.Caldwell, N.D.Scielzo, A.Czeszumska, J.A.Clark, G.Savard, A.Aprahamian, M.T.Burkey, C.J.Chiara, J.Harker, A.F.Levand, S.T.Marley, G.E.Morgan, J.M.Munson, E.B.Norman, A.Nystrom, R.Orford, S.W.Padgett, A.Perez Galvan, K.S.Sharma, K.Siegl, S.Y.Strauss β-delayed-neutron studies of 135,136Sb and 140I performed with trapped ions RADIOACTIVITY 135,136Sb, 140I(β-), (β-n) [from 252Cf(SF) CARIBU facility and mass scans of radioactive beams with the Canadian Penning Trap (CPT) mass spectrometer at Argonne National Laboratory]; measured recoil ions, Eβ, Eγ, (recoil ions)β- and βγ-coin using Beta-decay Paul Trap with two plastic-scintillator ΔE-E telescopes, two MCP detectors, and two HPGe detectors; deduced beta-delayed neutron spectra, beta-delayed neutron-emission probabilities (%β-n or Pn). Comparison with earlier experimental results.
doi: 10.1103/PhysRevC.101.025806
2019HO18 J.Phys.(London) G46, 083001 (2019) C.J.Horowitz, A.Arcones, B.Cote, I.Dillmann, W.Nazarewicz, I.U.Roederer, H.Schatz, A.Aprahamian, D.Atanasov, A.Bauswein, T.C.Beers, J.Bliss, M.Brodeur, J.A.Clark, A.Frebel, F.Foucart, C.J.Hansen, O.Just, A.Kankainen, G.C.McLaughlin, J.M.Kelly, S.N.Liddick, D.M.Lee, J.Lippuner, D.Martin, J.Mendoza-Temis, B.D.Metzger, M.R.Mumpower, G.Perdikakis, J.Pereira, B.W.O'Shea, R.Reifarth, A.M.Rogers, D.M.Siegel, A.Spyrou, R.Surman, X.Tang, T.Uesaka, M.Wang r-process nucleosynthesis: connecting rare-isotope beam facilities with the cosmos
doi: 10.1088/1361-6471/ab0849
2019OL02 Phys.Rev. C 99, 024321 (2019) B.Olaizola, L.M.Fraile, H.Mach, F.Nowacki, A.Poves, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, D.Radulov, G.S.Simpson, J.M.Udias Properties of low-lying states in 65Co from lifetime measurements RADIOACTIVITY 65Fe(β-)[from U(p, F), E=1.4 GeV followed by ionization using a Resonance Ionization Laser Ion Source (RILIS) at ISOLDE-CERN facility]; measured Eγ, Iγ, βγ- and γγ-coin, half-life of 65Fe g.s. from decay curves for γ rays, level half-lives by βγ(t) and βγγ(t) using fast timing technique. 65Co; deduced levels, J, π, β feedings, logft, B(M1), and B(E2). Comparison with large-scale shell model calculations. NUCLEAR STRUCTURE 65Co; calculated levels, J, π, occupation numbers using shell-model with LNPS effective interaction. Comparison with experimental data.
doi: 10.1103/PhysRevC.99.024321
2018AP03 Phys.Rev. C 98, 034303 (2018) A.Aprahamian, R.C.de Haan, S.R.Lesher, C.Casarella, A.Stratman, H.G.Borner, H.Lehmann, M.Jentschel, A.M.Bruce Lifetime measurements in 156Gd NUCLEAR REACTIONS 155Gd(n, γ), E=thermal; measured Eγ, Iγ, level half-lives by GRID technique for the broadening of decay γ-ray lines using GAMS4 double-flat-crystal spectrometer at the Institut Laue-Langevin (ILL-Grenoble) High Flux Reactor. 156Gd; deduced levels, J, π, B(E2), B(E1), intrinsic quadrupole moments, dynamic moments of inertia of the K=0+, 2+, 4+ bands. Systematics of levels, two-neutron and two-proton pairing gaps in 154,156,158,160Gd. Comparison with previous experimental values, and with partial dynamical symmetry (PDS), and 5DCH predictions.
doi: 10.1103/PhysRevC.98.034303
2018BU16 Phys.Rev. C 98, 064320 (2018) B.Bucher, H.Mach, A.Aprahamian, L.M.Robledo, G.S.Simpson, J.Rissanen, D.G.Ghita, B.Olaizola, W.Kurcewicz, J.Aysto, T.Eronen, L.M.Fraile, A.Jokinen, P.Karvonen, I.D.Moore, H.Penttila, M.Reponen, E.Ruchowska, A.Saastamoinen, M.K.Smith, C.Weber New insights into triaxiality and shape coexistence from odd-mass 109Rh RADIOACTIVITY 109Ru(β-)[from U(p, F), E=30 MeV]; measured Eγ, Iγ, γγ-coin, level half-lives using fast timing βγγ(t) technique at the IGISOL facility of University of Jyvaskyla. 109Rh; deduced levels, J, π, B(M1), B(E2). NUCLEAR STRUCTURE 109Rh; calculated potential energy surface (PES) in (β, γ) plane, proton single-particle energies as function of deformation parameters Q0 and γ, minimum energy E(β, γ) for the different blocked configurations using HFB method.
doi: 10.1103/PhysRevC.98.064320
2018OR02 Phys.Rev.Lett. 120, 262702 (2018) R.Orford, N.Vassh, J.A.Clark, G.C.McLaughlin, M.R.Mumpower, G.Savard, R.Surman, A.Aprahamian, F.Buchinger, M.T.Burkey, D.A.Gorelov, T.Y.Hirsh, J.W.Klimes, G.E.Morgan, A.Nystrom, K.S.Sharma Precision Mass Measurements of Neutron-Rich Neodymium and Samarium Isotopes and Their Role in Understanding Rare-Earth Peak Formation ATOMIC MASSES 154,156,158,159,160Nd, 162,163,164Sm; measured cyclotron frequency ratios; deduced mass excess values. Comparison with AME16 evaluation.
doi: 10.1103/PhysRevLett.120.262702
2018SI07 Phys.Rev. C 97, 035504 (2018) K.Siegl, N.D.Scielzo, A.Czeszumska, J.A.Clark, G.Savard, A.Aprahamian, S.A.Caldwell, B.S.Alan, M.T.Burkey, C.J.Chiara, J.P.Greene, J.Harker, S.T.Marley, G.E.Morgan, J.M.Munson, E.B.Norman, R.Orford, S.Padgett, A.Perez Galvan, K.S.Sharma, S.Y.Strauss Recoil ions from the β decay of 134Sb confined in a Paul trap RADIOACTIVITY 134,134mSb(β-)[from 252Cf SF decay at CARIBU-ANL facility]; measured β, γ, singly-charged recoil ions, βγ-coin, β(ce)-coin, (recoils)β-coin, time-of-flight spectra for β(ion)-coin using Beta-decay Paul Trap (BPT); deduced charge-state distribution of the recoiling ions, mean electron loss, β-ν correlation coefficient (aβν), β-decay simulations, significant β-decay strength (17.2%) to high-lying excited states in 134Te to obtain an angular correlation consistent with expected value of unity for 0- to 0+ β transition. Comparison of the observed β-decay spectrum with that from the decay scheme in the ENSDF database or Nuclear Data Sheets for 134Sb g.s. decay. Comparison of mean atomic electron loss in 134Sb decay with that from the decays of noble gases 6He, 23Ne, 35Ar, 41Ar, 85Kr and 133Xe. 134,134mSb; half-lives used from literature and those determined at CARIBU-ANL facility (reference 23 in this work).
doi: 10.1103/PhysRevC.97.035504
2018SI28 Phys.Rev. C 98, 054307 (2018) K.Siegl, K.Kolos, N.D.Scielzo, A.Aprahamian, G.Savard, M.T.Burkey, M.P.Carpenter, P.Chowdhury, J.A.Clark, P.Copp, G.J.Lane, C.J.Lister, S.T.Marley, E.A.McCutchan, A.J.Mitchell, J.Rohrer, M.L.Smith, S.Zhu Β-decay half-lives of 134, 134mSb and their isomeric yield ratio produced by the spontaneous fission of 252Cf RADIOACTIVITY 134m,134Sb(β-)[from 252Cf(SF), mass separated high-intensity beams]; measured Eβ, Iβ, Eγ, Iγ, βγ-coin, half-lives of decays of 134Sb and 134mSb, and isomeric yield ratios from 252Cf(SF) using the Scintillator And Tape Using Radioactive Nuclei (SATURN) system for β- detection, and X-Array for γ detection at the CARIBU facility of ANL. Systematics of isomeric yield ratios of 128,130,134Sb, 131,133Te, 132,134,136I, 135Xe, 138Cs from 252Cf(SF). Comparison with previous experimental values.
doi: 10.1103/PhysRevC.98.054307
2018VI02 Phys.Rev.Lett. 120, 262701 (2018) M.Vilen, J.M.Kelly, A.Kankainen, M.Brodeur, A.Aprahamian, L.Canete, T.Eronen, A.Jokinen, T.Kuta, I.D.Moore, M.R.Mumpower, D.A.Nesterenko, H.Penttila, I.Pohjalainen, W.S.Porter, S.Rinta-Antila, R.Surman, A.Voss, J.Aysto Precision Mass Measurements on Neutron-Rich Rare-Earth Isotopes at JYFLTRAP: Reduced Neutron Pairing and Implications for r-Process Calculations ATOMIC MASSES 156,158Nd, 158,160Pm, 162Sm, 162,163Eu, 163,164,165,166Gd, 164Tb; measured time-of-flight spectra, frequency ratios; deduced mass-excess values. Comparison with AME16 evaluation.
doi: 10.1103/PhysRevLett.120.262701
2017AP01 Phys.Rev. C 95, 024329 (2017) A.Aprahamian, S.R.Lesher, C.Casarella, H.G.Borner, M.Jentschel Lifetime measurements in 162Dy NUCLEAR REACTIONS Dy(n, γ), E=thermal neutrons from high flux reactor at the ILL-Grenoble; measured Eγ, Iγ, level half-lives by Gamma-Ray-Induced Doppler (GRID) broadening technique. 162Dy; deduced levels, bands, B(E2), B(E1), B(M1), collective quadrupole and octupole vibrational excitations. Comparison with Alaga rule predictions. Systematics of energies and B(E2) values for second 0+ and 2+ states in even-even Z=62-72 and N=84-100 nuclei.
doi: 10.1103/PhysRevC.95.024329
2017LE04 Phys.Rev. C 95, 064309 (2017) S.R.Lesher, C.Casarella, A.Aprahamian, L.M.Robledo, B.P.Crider, R.Ikeyama, I.R.Marsh, M.T.McEllistrem, E.E.Peters, F.M.Prados-Estevez, M.K.Smith, Z.R.Tully, J.R.Vanhoy, S.W.Yates Lifetime measurements of low-spin negative-parity levels in 160Gd NUCLEAR REACTIONS 160Gd(n, n'γ), E=1.5-2.8 MeV; measured Eγ, Iγ, γ(θ), excitation functions, level half-lives by DSAM at the University of Kentucky Accelerator Laboratory (UKAL). 160Gd; deduced levels, J, π, bands, multipolarities, mixing ratios, B(E2), B(E1), octupole vibrations; calculated potential energy surface in (Q20, Q30) plane. Comparison with generator coordinate method (GCM) calculations using the GognyD1S energy density functional.
doi: 10.1103/PhysRevC.95.064309
2017OL03 Phys.Rev. C 95, 061303 (2017) B.Olaizola, L.M.Fraile, H.Mach, A.Poves, F.Nowacki, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, D.Radulov, G.S.Simpson, J.M.Udias Search for shape-coexisting 0+ states in 66Ni from lifetime measurements RADIOACTIVITY 66Co(β-)[from 66Mn -> 66Fe decay, 66Mn from U(p, F), E=1.4 GeV at ISOLDE-CERN facility using RILIS]; measured Eγ, half-life of an excited 0+ state by βγγ(t) method using LaBr3(Ce) crystals and two HPGe detectors for γ rays, and a fast plastic scintillator for beta particles. 66Ni; deduced levels, B(E2). Comparison with large-scale shell model calculations, and with previous experimental data.
doi: 10.1103/PhysRevC.95.061303
2017OL08 J.Phys.(London) G44, 125103 (2017) B.Olaizola, L.M.Fraile, H.Mach, A.Poves, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, D.Radulov, G.S.Simpson, J.M.Udias Beta decay of 66Mn to the N = 40 nucleus 66Fe RADIOACTIVITY 66Mn(β-), (β-n) [from U(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced 66Fe T1/2, γ-ray energies and intensities, B(E2), B(M1) limits. Comparison with shell model calculations.
doi: 10.1088/1361-6471/aa915e
2017ON01 Phys.Rev. C 95, 055806 (2017) W.-J.Ong, C.Langer, F.Montes, A.Aprahamian, D.W.Bardayan, D.Bazin, B.A.Brown, J.Browne, H.Crawford, R.Cyburt, E.B.Deleeuw, C.Domingo-Pardo, A.Gade, S.George, P.Hosmer, L.Keek, A.Kontos, I.-Y.Lee, A.Lemasson, E.Lunderberg, Y.Maeda, M.Matos, Z.Meisel, S.Noji, F.M.Nunes, A.Nystrom, G.Perdikakis, J.Pereira, S.J.Quinn, F.Recchia, H.Schatz, M.Scott, K.Siegl, A.Simon, M.Smith, A.Spyrou, J.Stevens, S.R.Stroberg, D.Weisshaar, J.Wheeler, K.Wimmer, R.G.T.Zegers Low-lying level structure of 56Cu and its implications for the rp process NUCLEAR REACTIONS 2H(56Ni, 56Cu), E AP 75 MeV/nucleon, [secondary 56Ni beam from 9Be(58Ni, X), E=160 MeV/nucleon primary reaction using A1900 separator at NSCL-MSU facility]; measured ΔE-TOF particle identification for ions, Eγ, Iγ, γγ-, (56Cu ions)γ-coin using GRETINA array and S800 magnetic spectrograph. 56Cu; deduced levels, J, π. Comparison with mirror nucleus 56Co level scheme, and with shell-model calculations 55Ni(p, γ)56Cu, T9=0.1-10; deduced Q value, astrophysical reaction rates as function of temperature, and impact on the r-process around 56Ni. NUCLEAR STRUCTURE 56Cu; calculated levels, resonance energies, J, π, spectroscopic factors, Γp, Γγ using shell model with the GXPF1A interaction. Comparison with experimental data.
doi: 10.1103/PhysRevC.95.055806
2017OZ01 Phys.Rev. C 96, 045805 (2017) N.Ozkan, R.T.Guray, C.Yalcin, W.P.Tan, A.Aprahamian, M.Beard, R.J.deBoer, S.Almaraz-Calderon, S.Falahat, J.Gorres, Q.Li, A.Sauerwein, K.Sonnabend, M.Wiescher, Zs.Fulop, Gy.Gyurky, E.Somorjai, J.Greene Proton capture reaction cross section measurements on 162Er as a probe of statistical model calculations NUCLEAR REACTIONS 162Er(p, γ)163Tm, 162Er(p, n)162Tm, E=4.0-9.0 MeV in steps of 0.5 MeV; measured reaction products, Eγ, Iγ, σ(E) by activation method using the FN tandem accelerator at the University of Notre Dame; deduced S factors. Comparison with Hauser Feshbach (HF) statistical model calculations using NON-SMOKER and TALYS codes.
doi: 10.1103/PhysRevC.96.045805
2017VE05 Phys.Rev. C 96, 034311 (2017) V.Vedia, V.Paziy, L.M.Fraile, H.Mach, W.B.Walters, A.Aprahamian, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, D.Ghita, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, R.Lica, N.Marginean, R.Marginean, B.Olaizola, J.-M.Regis, M.Rudigier, T.Sava, G.S.Simpson, M.Stanoiu, L.Stroe Search for the 73Ga ground-state doublet splitting in the β decay of 73Zn RADIOACTIVITY 73Zn(β-)[from U(p, F), E=1.4 GeV]; measured Eγ, Iγ, βγ- and γγ-coin, half-life of 73Zn from γ-decay curves, level half-lives by fast-timing βγγ(t) technique using Resonance Ionization Laser Ion Source (RILIS) and magnetic high-resolution mass separator (HRS) at ISOLDE-CERN. 73Ga; deduced levels, ground state doublet, J, π, β feedings, logft, B(M1), B(E2). 73Zn(IT); measured Eγ, half-life of the isomer; deduced no evidence for a 42-keV transition from the isomer. Comparison with previous measurements, and with shell-model calculations. Systematics of level structure in 71,73,75Ga.
doi: 10.1103/PhysRevC.96.034311
2016BA28 Eur.Phys.J. A 52, 126 (2016) A.Battaglia, W.Tan, R.Avetisyan, C.Casarella, A.Gyurijinyan, K.V.Manukyan, S.T.Marley, A.Nystrom, N.Paul, K.Siegl, K.Smith, M.K.Smith, S.Y.Strauss, A.Aprahamian Measurements of conversion electrons in the s-process branching point nucleus 176Lu NUCLEAR REACTIONS 176Yb(p, n), E=7.75 MeV; measured Eγ, Iγ from 176Lu using HPGe from GEORGINA array, eγ-coin, internal conversion electrons using ICEBall, En, In using NE213; deduced γ energy spectra, γ-ray and electron spectra in coincidence. 176Lu deduced electron energies, ICE coefficients, γ-ray transition multipolarity, levels, J, π, partial level scheme.
doi: 10.1140/epja/i2016-16126-x
2016BE09 Phys.Rev. C 93, 044337 (2016) I.Bentley, Y.Colon Rodriguez, S.Cunningham, A.Aprahamian Shell structure from nuclear observables NUCLEAR STRUCTURE Z=6-100, N=6-152; analyzed shell closures from nuclear observables such as energies of yrast (2+, 4+, 6+, 8+ and 10+) states and B(E2) of first 2+ states, S(2n), S(2p), binding energies, mean-square charge radius in even-even nuclei, Odd-A ground-state Jπ. Predictions on the appearance and disappearance of nuclear shells.
doi: 10.1103/PhysRevC.93.044337
2016CU02 Phys.Rev. C 94, 034313 (2016) N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman 8Be + 8Be and 12C + α breakup states in 16O populated via the 13C(4He, 4α)n reaction NUCLEAR REACTIONS 13C(α, 16O), E=22.0, 27.0, 27.5, 28.0 MeV; measured reaction products using four position-sensitive double-sided Si strip detectors, at Notre Dame FN Tandem accelerator facility. 16O; deduced levels identified through the 8Be+8Be and 12C*+α channels, J, π, centroids, cross sections. Comparison with previous studies using 12C(α, 8Be)8Be and 12C(16O, 4α)12C reactions. Relevance to 4α chain structure in 16O.
doi: 10.1103/PhysRevC.94.034313
2016MU01 Prog.Part.Nucl.Phys. 86, 86 (2016); Erratum Prog.Part.Nucl.Phys. 87, 116 (2016) M.R.Mumpower, R.Surman, G.C.McLaughlin, A.Aprahamian The impact of individual nuclear properties on r-process nucleosynthesis
doi: 10.1016/j.ppnp.2015.09.001
2016SM02 Phys.Rev. C 94, 014320 (2016) R.Smith, C.Wheldon, M.Freer, N.Curtis, Tz.Kokalova, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, V.A.Ziman Evidence for a 3.8 MeV state in 9Be NUCLEAR REACTIONS 9Be(α, n3α), E=22, 26 MeV; measured Eα, Iα using an array of double-sided silicon strip detectors (DSSSDs) at the Notre Dame FN Tandem Van de Graaff accelerator facility; extracted sum energy spectra for all four final-state particles, assumed to be 3α+n, 9Be excitation spectrum. 9Be; deduced levels, new state at 3.8 MeV, J, π, width, ratios of reduced widths to Wigner limits (decays to 8Be ground state). 9Be, 9B; comparison of levels and widths in mirror nuclei.
doi: 10.1103/PhysRevC.94.014320
2016SU08 Acta Phys.Pol. B47, 673 (2016) R.Surman, M.Mumpower, A.Aprahamian Uncorrelated Nuclear Mass Uncertainties and r-process Abundance Predictions NUCLEAR STRUCTURE A=50-220; calculated isotopic yields and abundances of elements produced during the r-process.
doi: 10.5506/APhysPolB.47.673
2015BU15 Phys.Rev. C 92, 064312 (2015) B.Bucher, H.Mach, A.Aprahamian, G.S.Simpson, J.Rissanen, D.G.Ghita, B.Olaizola, W.Kurcewicz, J.Aysto, I.Bentley, T.Eronen, L.M.Fraile, A.Jokinen, P.Karvonen, I.D.Moore, H.Penttila, M.Reponen, E.Ruchowska, A.Saastamoinen, M.K.Smith, C.Weber New lifetime measurements in 109Pd and the onset of deformation at N=60 RADIOACTIVITY 109Rh(β-)[from U(p, F), E=30 MeV at IGISOL facility of University of Jyvaskyla]; measured Eγ, Iγ, γγ-, βγγ-coin, level half-lives by fast timing βγγ(t) technique. 109Pd; deduced levels, J, π, configuration, B(M1), B(E2), B(E1); discussed strong pn interaction between πg9/2 and νg7/2 valence nucleons. Systematics of band structures, (d, p) and (d, t) spectroscopic strengths in 101,103,105,107,109,111Pd. Systematics of 7/2+ and 5/2+ states in odd-A Pd, Rh and Ag isotopes.
doi: 10.1103/PhysRevC.92.064312
2015LE05 Phys.Rev. C 91, 054317 (2015) S.R.Lesher, C.Casarella, A.Aprahamian, B.P.Crider, R.Ikeyama, I.R.Marsh, M.T.McEllistrem, E.E.Peters, F.M.Prados-Estevez, M.K.Smith, Z.R.Tully, J.R.Vanhoy, S.W.Yates Collectivity of 0+ states in 160Gd NUCLEAR REACTIONS 160Gd(n, n'), E<2.8 MeV; measured Eγ, Iγ, excitation functions, γ(θ), level half-lives by DSAM at University of Kentucky Accelerator Laboratory (UKAL). 160Gd; deduced levels, J, π, level scheme for decay of bands based on excited 0+ states, B(E2), B(E1), B(M1), collective nature of states.
doi: 10.1103/PhysRevC.91.054317
2015MU04 J.Phys.(London) G42, 034027 (2015) M.Mumpower, R.Surman, D.L.Fang, M.Beard, A.Aprahamian The impact of uncertain nuclear masses near closed shells on the r-process abundance pattern
doi: 10.1088/0954-3899/42/3/034027
2015MU12 Phys.Rev. C 92, 035807 (2015) M.R.Mumpower, R.Surman, D.-L.Fang, M.Beard, P.Moller, T.Kawano, A.Aprahamian Impact of individual nuclear masses on r-process abundances NUCLEAR STRUCTURE Z=30-75, N=60-130, A=120-210; calculated relevant Q values, neutron capture rates, photodissociation rates, β-decay rates, and β-delayed neutron emission probabilities using the 2012 version of the Finite-Range Droplet Model (FRDM), and by considering variations of individual nuclear masses; deduced influence of uncertainties in individual masses on the r-process abundance distribution.
doi: 10.1103/PhysRevC.92.035807
2015XU11 Phys.Rev. C 92, 015807 (2015) J.Xu, E.Shields, F.Calaprice, S.Westerdale, F.Froborg, B.Suerfu, T.Alexander, A.Aprahamian, H.O.Back, C.Casarella, X.Fang, Yo.K.Gupta, A.Ianni, E.Lamere, W.H.Lippincott, Q.Liu, S.Lyons, K.Siegl, M.Smith, W.Tan, B.Vande Kolk Scintillation efficiency measurement of Na recoils in NaI(Tl) below the DAMA/LIBRA energy threshold NUCLEAR REACTIONS Na, I(n, n'), E=690 keV pulsed beam; measured Na-recoil spectra, double-TOF spectrum for coincidence events of Na recoils, E(n), I(n), 127I excitation events at Notre Dame accelerator facility; deduced Na-recoil quenching factors, spectral fits of the DAMA/LIBRA modulation amplitudes to standard WIMP model. Comparison with other experimental results for Na-recoil quenching factors. Relevance to DAMA/LIBRA dark matter claims.
doi: 10.1103/PhysRevC.92.015807
2014LA16 Phys.Rev.Lett. 113, 032502 (2014) C.Langer, F.Montes, A.Aprahamian, D.W.Bardayan, D.Bazin, B.A.Brown, J.Browne, H.Crawford, R.H.Cyburt, C.Domingo-Pardo, A.Gade, S.George, P.Hosmer, L.Keek, A.Kontos, I-Y.Lee, A.Lemasson, E.Lunderberg, Y.Maeda, M.Matos, Z.Meisel, S.Noji, F.M.Nunes, A.Nystrom, G.Perdikakis, J.Pereira, S.J.Quinn, F.Recchia, H.Schatz, M.Scott, K.Siegl, A.Simon, M.Smith, A.Spyrou, J.Stevens, S.R.Stroberg, D.Weisshaar, J.Wheeler, K.Wimmer, R.G.T.Zegers Determining the rp-Process Flow through 56Ni: Resonances in 57Cu(p, γ)58Zn identified with GRETINA NUCLEAR REACTIONS 2H(57Cu, n), E=75 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced resonance energies, J, π, reaction rates. Shell model calculations, GXPF1A interaction.
doi: 10.1103/PhysRevLett.113.032502
2014LI32 Phys.Rev. C 90, 014320 (2014) R.Lica, N.Marginean, D.G.Ghita, H.Mach, L.M.Fraile, G.S.Simpson, A.Aprahamian, C.Bernards, J.A.Briz, B.Bucher, C.J.Chiara, Z.Dlouhy, I.Gheorghe, P.Hoff, J.Jolie, U.Koster, W.Kurcewicz, R.Marginean, B.Olaizola, V.Paziy, J.M.Regis, M.Rudigier, T.Sava, M.Stanoiu, L.Stroe, W.B.Walters Low-lying isomeric states in 80Ga from the β- decay of 80Zn RADIOACTIVITY 80Zn(β-)[from U(p, X), E=1.4 GeV]; measured Eγ, Iγ, γγ-, βγ-coin, half-life of 708-keV level in 80Zn by βγγ(t) at ISOLDE-CERN facility. 80Ga; deduced levels, ordering of the ground state and long-lived isomer, J, π, conversion coefficient, multipolarities, β feedings, logft, reduced transition probabilities. Comparison with shell model calculations using jj44bpn and JUN45 interactions.
doi: 10.1103/PhysRevC.90.014320
2013CU04 Phys.Rev. C 88, 064309 (2013) N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman Investigation of the 4α linear chain state in 16O NUCLEAR REACTIONS 12C(α, 8Be)8Be, (α, 12C), [12C* decaying to 8Be+α], E=12.2-20.0 MeV; measured Eα, Iα, α(θ), αα-coin, σ(E, θ) at Notre Dame FN tandem facility. Phase shift analysis of σ(θ) data. 16O; deduced levels, resonances, J. Comparison with previous experimental results. No evidence found for rigid, 4α-linear chain in 16O.
doi: 10.1103/PhysRevC.88.064309
2013KO15 Phys.Rev. C 87, 057309 (2013) Tz.Kokalova, M.Freer, N.Curtis, N.I.Ashwood, M.Barr, J.D.Malcolm, C.Wheldon, V.A.Ziman, S.Almaraz-Calderon, A.Aprahamian, B.Bucher, M.Couder, X.Fang, F.Jung, W.Lu, A.Roberts, W.P.Tan, P.Copp, S.R.Lesher Yield measurements for resonances above the multi-α threshold in 20Ne NUCLEAR REACTIONS 16O(α, X), E=23.0-29.0 MeV; measured α and particle spectra, (particle)(particle)α-coin, yields for 8Be+8Be+α, and 8Be+12C(second 0+) channels. Measurements at Notre Dame facility. 20Ne; deduced levels, resonances, J. Monte Carlo simulations.
doi: 10.1103/PhysRevC.87.057309
2013OL06 Phys.Rev. C 88, 044306 (2013) B.Olaizola, L.M.Fraile, H.Mach, A.Aprahamian, J.A.Briz, J.Cal-Gonzalez, D.Ghita, U.Koster, W.Kurcewicz, S.R.Lesher, D.Pauwels, E.Picado, A.Poves, D.Radulov, G.S.Simpson, J.M.Udias β- decay of 65Mn to 65Fe RADIOACTIVITY 65Mn(β-), (β-n)[from U(p, X), E=1.4 GeV, RILIS]; measured Eγ, Iγ, Eβ, βγ-, βγγ-, γγ-coin, βγγ(t), half-life of 65Mn ground state, half-lives of 65Fe levels by fast timing, β-delayed neutron emission probability Pn at ISOLDE, CERN facility. 65Fe; deduced levels, isomer, J, π, multipolarity, B(M1), B(E1), B(E2), β feedings, logft. 64Fe, 64Co, 65mFe, 65Ni(β-); measured Eγ, Iγ of selected γ rays to deduce ground state β feeding in the decay of 65Mn to 65Fe. Comparison with shell-model calculations. 64Fe; deduced levels populated by β-n decay mode. Systematics of energies and B(E2) values of first 2+ states in Z=24, 26, 28, N=34-46 nuclei.
doi: 10.1103/PhysRevC.88.044306
2012AL11 Phys.Rev. C 86, 025801 (2012); Pub.Note. Phys.Rev. C 86, 029901 (2012) S.Almaraz-Calderon, W.P.Tan, A.Aprahamian, B.Bucher, A.Roberts, M.Wiescher, C.R.Brune, T.N.Massey, N.Ozkan, R.T.Guray, H.Mach Level structure of 18Ne and its importance in the 14O(α, p)17F reaction rate NUCLEAR REACTIONS 16O(3He, n), E=15 MeV; measured neutron and charged particle spectra, (particle)n-coin, neutron time-of-flight spectrum, p(θ), branching ratios for proton, 2p and α decays of excited states. 18Ne; deduced levels, resonances, J, π, decay modes, widths. 14,16O, 17F; populated g.s. from p, 2p and α decays of 18Ne resonances, and first excited state in 17F from p decay of 18Ne resonances. 14O(α, p)17F, T=0.1-5 GK; calculated reaction rates of astrophysical interest for Hot CNO cycles and their breakout paths towards the rp process. Comparison with previous studies.
doi: 10.1103/PhysRevC.86.025801
2012AL23 Phys.Rev. C 86, 065805 (2012); Erratum Phys.Rev. C 88, 059902 (2013) S.Almaraz-Calderon, W.P.Tan, A.Aprahamian, M.Beard, G.P.A.Berg, B.Bucher, M.Couder, J.Gorres, S.O'Brien, D.Patel, A.Roberts, K.Sault, M.Wiescher, C.R.Brune, T.N.Massey, K.Fujita, K.Hatanaka, D.Ishiwaka, H.Matsubara, H.Okamura, H.J.Ong, Y.Sakemi, Y.Shimizu, T.Suzuki, Y.Tameshige, A.Tamii, J.Zenihiro, T.Kubo, Y.Namiki, Y.Ohkuma, Y.Shimbara, S.Suzuki, R.Watanabe, R.Yamada, T.Adachi, Y.Fujita, H.Fujita, M.Dozono, T.Wakasa Level structure of 30S and its importance in the 26Si(α, p)29P and 29P(p, γ)30S reaction rates NUCLEAR REACTIONS 32S(p, t), E=98.7 MeV; measured triton spectra at two angles using Grand Raiden (GR) magnetic spectrometer at RCNP facility. 28Si(3He, n), E=15 MeV; measured neutron (TOF) spectra, charged-particle spectra, (charged-particle)n-coin, angular distributions using LESA array and scintillation detectors at Notre Dame NSL facility. 30S; deduced levels, proton- and α- unbound levels, J, π, proton branching ratios, partial proton widths. DWBA analysis. Comparison with several previous experimental studies. 29P(p, γ)30S, 26Si(α, p)29P, T9=0.01-10 GK; deduced astrophysical reaction rates. Comparison with previous theoretical calculations. Contribution of resonances to total reaction rates.
doi: 10.1103/PhysRevC.86.065805
2012BR17 Eur.Phys.J. A 48, 184 (2012) S.Brett, I.Bentley, N.Paul, R.Surman, A.Aprahamian Sensitivity of the r-process to nuclear masses COMPILATION Sn; compiled masses, Q from AME-2003, Duflo-Zucker, HFB-21 and FRDM calculations. A≈70-210 suggested, evaluated new mass formula. A≈125-240; compiled, calculated r-process abundances for different scenarii, neutron Q-values.
doi: 10.1140/epja/i2012-12184-4
2012CU04 J.Phys.:Conf.Ser. 381, 012079 (2012) N.Curtis, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, X.Fang, M.Freer, G.Goldring, F.Jung, S.R.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman Does a 4-α linear chain exist in 16O? NUCLEAR REACTIONS 12C(α, 8Be), E=12.2-20.0 MeV; measured Eα, Iα from 8Be decay using DSSSD; deduced σ(θ=900), doublet 6+ resonance and its components.
doi: 10.1088/1742-6596/381/1/012079
2012FR11 J.Phys.:Conf.Ser. 381, 012009 (2012) M.Freer, S.Almaraz-Calderon, J.Carter, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, R.Smit, W.P.Tan, C.Wheldon, V.A.Ziman Simplicity from Complexity
doi: 10.1088/1742-6596/381/1/012009
2012QU01 Phys.Rev. C 85, 035807 (2012) M.Quinn, A.Aprahamian, J.Pereira, R.Surman, O.Arndt, T.Baumann, A.Becerril, T.Elliot, A.Estrade, D.Galaviz, T.Ginter, M.Hausmann, S.Hennrich, R.Kessler, K.-L.Kratz, G.Lorusso, P.F.Mantica, M.Matos, F.Montes, B.Pfeiffer, M.Portillo, H.Schatz, F.Schertz, L.Schnorrenberger, E.Smith, A.Stolz, W.B.Walters, A.Wohr β decay of nuclei around 90Se: Search for signatures of a N=56 subshell closure relevant to the r process NUCLEAR REACTIONS 9Be(136Xe, X)86As/87As/88As/88Se/89Se/90Se/90Br/91Br/92Br/93Br/91Kr/92Kr/93Kr/94Kr/95Kr/93Rb/94Rb/95Rb/96Rb/97Rb/95Sr/96Sr/97Sr/98Sr/99Sr/97Y/98Y/99Y/100Y/101Y/100Zr/101Zr/102Zr/103Zr, E=120 MeV/nucleon; measured fragment spectra by energy loss and time-of-flight, total kinetic energies (TKE) of 97,98,99Sr fragments in 36+, 37+, 38+ charge states, half-lives by fragment-β correlations. Beta Counting System (BCS) at NSCL. RADIOACTIVITY 87,88As, 88,89,90Se, 90,91,92,93Br, 93,94,95Kr, 95,96,97Rb, 96,97,98,99Sr, 99,100,101Y(β-)[from 9Be(136Xe, X), E=120 MeV/nucleon]; measured Eβ, Eγ, (fragment)β correlations, half-lives. Beta Counting System (BCS) at NSCL and SEGA array. Maximum likelihood and least-squares analyses for half-lives. Comparison of measured half-lives with QRPA calculations used in r process, and with previous measurements. Role of g9/2 proton and h11/2 neutron intruders. No evidence of N=56 subshell closure in 90Se. Relevance to r-process nuclei.
doi: 10.1103/PhysRevC.85.035807
2011FR02 Phys.Rev. C 83, 034314 (2011) M.Freer, S.Almaraz-Calderon, A.Aprahamian, N.I.Ashwood, M.Barr, B.Bucher, P.Copp, M.Couder, N.Curtis, X.Fang, F.Jung, S.Lesher, W.Lu, J.D.Malcolm, A.Roberts, W.P.Tan, C.Wheldon, V.A.Ziman Evidence for a new 12C state at 13.3 MeV NUCLEAR REACTIONS 9Be, 12C(α, 3α), E=22-30 MeV; measured Eα, Iα, 12C-α angular correlations; deduced Dalitz plot. 12C; deduced levels, J, π, width. Possible collective excitation of Hoyle state.
doi: 10.1103/PhysRevC.83.034314
2011PE34 J.Phys.:Conf.Ser. 312, 042019 (2011) J.Pereira, A.Aprahamian, O.Arndt, A.Becerril, T.Elliot, A.Estrade, D.Galaviz, S.Hennrich, P.Hosmer, R.Kessler, K.-L.Kratz, G.Lorusso, P.F.Mantica, M.Matos, F.Montes, B.Pfeiffer, M.Quinn, P.Santi, H.Schatz, F.Schertz, L.Schnorrenberger, E.Smith, A.Stolz, W.B.Walters, A.Wohr β-decay measurements of A simeq 70 ≈ 110 r-process nuclei at the National Superconducting Cyclotron Laboratory RADIOACTIVITY 106,107,108,109Nb, 108,109,110,111Mo(β-); compiled T1/2; calculated T1/2, Solar system r-process abundances using new T1/2.
doi: 10.1088/1742-6596/312/4/042019
2010HO12 Phys.Rev. C 82, 025806 (2010) P.Hosmer, H.Schatz, A.Aprahamian, O.Arndt, R.R.C.Clement, A.Estrade, K.Farouqi, K.-L.Kratz, S.N.Liddick, A.F.Lisetskiy, P.F.Mantica, P.Moller, W.F.Mueller, F.Montes, A.C.Morton, M.Ouellette, E.Pellegrini, J.Pereira, B.Pfeiffer, P.Reeder, P.Santi, M.Steiner, A.Stolz, B.E.Tomlin, W.B.Walters, A.Wohr Half-lives and branchings for β-delayed neutron emission for neutron-rich Co-Cu isotopes in the r-process RADIOACTIVITY 73,74,75Co, 75,76,77,78Ni, 76,77,78,79,80Cu, 79,80,81Zn, 81,82Ga(β-), (β-n)[from Be(86Kr, X), E=140 MeV/nucleon]; measured β spectra, βn-coin, neutron spectra, half-lives, delayed neutron-emission probabilities; calculated half-lives, P(n) using QRPA, CQRPA and OXBASH shell model. Discussed effects on various types of models for the rapid neutron-capture process (r-process) in nucleosynthesis. A=1-210; calculated abundances with classical r-process and HEW models using known decay data. 78Ni(β-); calculated Gamow-Teller strengths, effect on abundances.
doi: 10.1103/PhysRevC.82.025806
2010TA17 Nucl.Phys. A834, 679c (2010) W.P.Tan, S.Almaraz, A.Aprahamian, B.Bucher, J.Gorres, H.Mach, M.Wiescher, C.Brune, Z.Heinen, T.Massey α-Induced Reaction Rates for Accreting Compact Stars NUCLEAR REACTIONS 16O, 28Si(3He, n), E=15 MeV; measured ToF neutron σ(E). 18Ne, 30S; deduced energies of levels.
doi: 10.1016/j.nuclphysa.2010.01.123
2009PE06 Phys.Rev. C 79, 035806 (2009) J.Pereira, S.Hennrich, A.Aprahamian, O.Arndt, A.Becerril, T.Elliot, A.Estrade, D.Galaviz, R.Kessler, K.-L.Kratz, G.Lorusso, P.F.Mantica, M.Matos, P.Moller, F.Montes, B.Pfeiffer, H.Schatz, F.Schertz, L.Schnorrenberger, E.Smith, A.Stolz, M.Quinn, W.B.Walters, A.Wohr β-decay half-lives and β-delayed neutron emission probabilities of nuclei in the region A ≤ 110, relevant for the r process RADIOACTIVITY 100,101,102,103,104,105Y, 103,104,105,106,107Zr, 106,107,108,109Nb, 108,109,110,111Mo, 109,110,111,112,113Tc(β-), (β-n)[from 9Be(136Xe, X), E=120 MeV/nucleon]; measured fragments, neutrons, β, (fragment)β-coin, half-lives; deduced delayed neutron-emission probabilities. Comparisons with quasiparticle random phase approximation (QRPA03 and QRPA06) calculations. Discussed relevance to r-process nuclei.
doi: 10.1103/PhysRevC.79.035806
2008MA09 J.Phys.(London) G35, 014045 (2008) M.Matos, A.Estrade, M.Amthor, A.Aprahamian, D.Bazin, A.Becerril, T.Elliot, D.Galaviz, A.Gade, S.Gupta, G.Lorusso, F.Montes, J.Pereira, M.Portillo, A.M.Rogers, H.Schatz, D.Shapira, E.Smith, A.Stolz, M.Wallace TOF-Bρ mass measurements of very exotic nuclides for astrophysical calculations at the NSCL
doi: 10.1088/0954-3899/35/1/014045
2008PE17 Nucl.Phys. A805, 470c (2008) J.Pereira, A.Aprahamian, O.Arndt, A.Becerril, T.Elliot, A.Estrade, D.Galaviz, S.Hennrich, P.Hosmer, L.Schnorrenberger, R.Kessler, K.-L.Kratz, G.Lorusso, P.F.Mantica, M.Matos, F.Montes, B.Pfeiffer, M.Quinn, P.Santi, H.Schatz, F.Schertz, E.Smith, B.E.Tomlin, W.B.Walters, A.Wohr β-decay studies of r-process nuclei at NSCL
doi: 10.1016/j.nuclphysa.2008.02.268
2008SK06 Phys.Rev. C 78, 044603 (2008) B.B.Skorodumov, G.V.Rogachev, A.Aprahamian, V.Z.Goldberg, J.J.Kolata, S.Almaraz, H.Amro, E.D.Johnson, L.O.Lamm, M.Quinn, A.Teymurazyan, A.Woehr T = 3/2 states in 13C NUCLEAR REACTIONS 1H, C(11B, 11B), (12B, 12B), E=44.6 MeV; measured σ(θ). 13C; deduced levels, J, π, resonance widths. Comparisons with 13B, 13N, 13O, shell model calculations.
doi: 10.1103/PhysRevC.78.044603
2007MA83 Phys.Rev. C 76, 064304 (2007) K.H.Maier, T.Kibedi, G.D.Dracoulis, P.Boutachkov, A.Aprahamian, A.P.Byrne, P.M.Davidson, G.J.Lane, M.Marie-Jeanne, P.Nieminen, H.Watanabe Measurement of conversion electrons with the 208Pb(p, n)208Bi reaction and derivation of the shell model proton neutron hole interaction from the properties of 208Bi NUCLEAR REACTIONS 208Pb(p, n), E=9 MeV; measured ce, (ce)(ce)-, γ(ce)-coin; analyzed Eγ, Iγ, γγ-coin. 208Bi; deduced levels, J, π, multipolarities, configurations, angular momenta, spectroscopic factors for proton transfer and neutron pickup. Detailed shell-model calculations.
doi: 10.1103/PhysRevC.76.064304
2007SK02 Phys.Rev. C 75, 024607 (2007) B.B.Skorodumov, G.V.Rogachev, P.Boutachkov, A.Aprahamian, V.Z.Goldberg, A.Mukhamedzhanov, S.Almaraz, H.Amro, F.D.Becchetti, S.Brown, Y.Chen, H.Jiang, J.J.Kolata, L.O.Lamm, M.Quinn, A.Woehr Lowest excited states of 13O NUCLEAR REACTIONS 1H(12N, p), E(cm)=0.8-2.7 MeV; measured Ep, excitation functions for elastic scattering. 13O deduced resonance energies, J, π, widths. 12N(p, γ), E=low; calculated astrophysical reaction rates. R-matrix calculations.
doi: 10.1103/PhysRevC.75.024607
2006AP01 Nucl.Phys. A764, 42 (2006) A.Aprahamian, X.Wu, S.R.Lesher, D.D.Warner, W.Gelletly, H.G.Borner, F.Hoyler, K.Schreckenbach, R.F.Casten, Z.R.Shi, D.Kusnezov, M.Ibrahim, A.O.Macchiavelli, M.A.Brinkman, J.A.Becker Complete spectroscopy of the 162Dy nucleus NUCLEAR REACTIONS 161Dy(n, γ), E=0.03-2 MeV; measured Eγ, Iγ, E(ce), I(ce). 160Gd(α, 2n), E=256 MeV; measured Eγ, Iγ, γγ-coin. 162Dy deduced levels, K, J, π, ICC, configurations, collective features. Complete spectroscopy, Ritz combination principle.
doi: 10.1016/j.nuclphysa.2005.09.020
2006BO08 Nucl.Phys. A768, 22 (2006) P.Boutachkov, K.H.Maier, A.Aprahamian, G.V.Rogachev, L.O.Lamm, M.Quinn, B.B.Skorodumov, A.Wohr Study of the low spin states of 208Bi through γ-γ spectroscopy NUCLEAR REACTIONS 208Pb(p, n), E=9.0 MeV; measured Eγ, Iγ, γγ-coin. 208Bi deduced levels, J, π, transition multipolarities. Comparison with shell-model predictions.
doi: 10.1016/j.nuclphysa.2006.01.004
2006MO07 Phys.Rev. C 73, 035801 (2006) F.Montes, A.Estrade, P.T.Hosmer, S.N.Liddick, P.F.Mantica, A.C.Morton, W.F.Mueller, M.Ouellette, E.Pellegrini, P.Santi, H.Schatz, A.Stolz, B.E.Tomlin, O.Arndt, K.-L.Kratz, B.Pfeiffer, P.Reeder, W.B.Walters, A.Aprahamian, A.Wohr β-decay half-lives and β-delayed neutron emission probabilities for neutron rich nuclei close to the N = 82 r-process path RADIOACTIVITY 114,115Tc, 114,115,116,117,118Ru, 116,117,118,119,120,121Rh, 119,120,121,122,123,124Pd, 121,122,123,124Ag(β-) [from Be(136Xe, X)]; measured T1/2. 116,117,118,119,120Rh, 121,122,123Pd, 122,123,124Ag(β-n); measured β-delayed neutron emission probability. Astrophysical implications discussed.
doi: 10.1103/PhysRevC.73.035801
2006SK09 Phys.Atomic Nuclei 69, 1979 (2006) B.B.Skorodumov, G.V.Rogachev, P.Boutachkov, A.Aprahamian, J.J.Kolata, L.O.Lamm, M.Quinn, A.Woehr Investigation of the 19Na Nucleus via Resonance Elastic Scattering NUCLEAR REACTIONS 1H(18Ne, p), E=56 MeV; measured Ep, σ(θ), elastic scattering excitation function. 19Na deduced resonance energy, J, π. Astrophysical implications discussed.
doi: 10.1134/S1063778806120015
2005AP02 Prog.Part.Nucl.Phys. 54, 535 (2005) A.Aprahamian, K.Langanke, M.Wiescher Nuclear structure aspects in nuclear astrophysics
doi: 10.1016/j.ppnp.2004.09.002
2005AP06 Nat.Phys. 1, 81 (2005) Nuclear physics: Long live isomer research
doi: 10.1038/nphys150
2005BO36 Phys.Rev.Lett. 95, 132502 (2005) P.Boutachkov, G.V.Rogachev, V.Z.Goldberg, A.Aprahamian, F.D.Becchetti, J.P.Bychowski, Y.Chen, G.Chubarian, P.A.DeYoung, J.J.Kolata, L.O.Lamm, G.F.Peaslee, M.Quinn, B.B.Skorodumov, A.Wohr Doppler Shift as a Tool for Studies of Isobaric Analog States of Neutron-Rich Nuclei: Application to 7He NUCLEAR REACTIONS 1H(6He, γ), E < 24 MeV; measured Eγ, Iγ; deduced IAS formation σ, σ(θ). 7Li deduced resonance parameters. Doppler-shift analysis technique.
doi: 10.1103/PhysRevLett.95.132502
2005BO49 Eur.Phys.J. A 25, Supplement 1, 259 (2005) P.Boutachkov, G.V.Rogachev, V.Z.Goldberg, A.Aprahamian, F.D.Becchetti, J.P.Bychowski, Y.Chen, G.Chubarian, P.A.DeYoung, J.J.Kolata, L.O.Lamm, G.F.Peaslee, M.Quinn, B.B.Skorodumov, A.Wohr Isobaric analog states of neutron-rich nuclei. Doppler shift as a measurement tool for resonance excitation functions NUCLEAR REACTIONS 1H(6He, n), E not given; measured Doppler-shifted Eγ, Iγ. 7Li deduced resonance features, IAS.
doi: 10.1140/epjad/i2005-06-014-4
2005CA02 Eur.Phys.J. A 23, 201 (2005) M.Caamano, P.M.Walker, P.H.Regan, M.Pfutzner, Zs.Podolyak, J.Gerl, M.Hellstrom, P.Mayet, M.N.Mineva, A.Aprahamian, J.Benlliure, A.M.Bruce, P.A.Butler, D.Cortina Gil, D.M.Cullen, J.Doring, T.Enqvist, C.Fox, J.Garces Narro, H.Geissel, W.Gelletly, J.Giovinazzo, M.Gorska, H.Grawe, R.Grzywacz, A.Kleinbohl, W.Korten, M.Lewitowicz, R.Lucas, H.Mach, C.D.O'Leary, F.De Oliveira, C.J.Pearson, F.Rejmund, M.Rejmund, M.Sawicka, H.Schaffner, C.Schlegel, K.Schmidt, K.-H.Schmidt, P.D.Stevenson, Ch.Theisen, F.Vives, D.D.Warner, C.Wheldon, H.J.Wollersheim, S.Wooding, F.Xu, O.Yordanov Isomers in neutron-rich A ≈ 190 nuclides from 208Pb fragmentation NUCLEAR REACTIONS Be(208Pb, X), E=1 GeV/nucleon; measured fragments isotopic yields, delayed Eγ, γγ-, (particle)γ-coin; deduced isomer production ratios. RADIOACTIVITY 188Ta, 190W, 192,193Re, 195Os, 197,198Ir, 200,201,202Pt, 203Au(IT) [from Be(208Pb, X)]; measured Eγ, Iγ, γγ-coin, T1/2. 188Ta, 190W, 192,193Re, 195Os, 197,198Ir, 200,201,202Pt, 203Au deduced transitions. 190W, 200,201,202Pt deduced levels, J, π. 174,175Er, 185Hf, 191,194Re, 199Ir(IT) [from Be(208Pb, X)]; measured Eγ, Iγ.
doi: 10.1140/epja/i2004-10079-7
2005HO08 Phys.Rev.Lett. 94, 112501 (2005) P.T.Hosmer, H.Schatz, A.Aprahamian, O.Arndt, R.R.C.Clement, A.Estrade, K.-L.Kratz, S.N.Liddick, P.F.Mantica, W.F.Mueller, F.Montes, A.C.Morton, M.Ouellette, E.Pellegrini, B.Pfeiffer, P.Reeder, P.Santi, M.Steiner, A.Stolz, B.E.Tomlin, W.B.Walters, A.Wohr Half-Life of the Doubly Magic r-Process Nucleus 78Ni RADIOACTIVITY 75,76,77,78Ni, 77,78Cu(β-) [from Be(86Kr, X)]; measured T1/2. Astrophysical implications discussed.
doi: 10.1103/PhysRevLett.94.112501
2005KA45 Eur.Phys.J. A 25, Supplement 1, 117 (2005) T.Kautzsch, A.Wohr, W.B.Walters, K.-L.Kratz, B.Pfeiffer, M.Hannawald, J.Shergur, O.Arndt, S.Hennrich, S.Falahat, T.Griesel, O.Keller, A.Aprahamian, B.A.Brown, P.F.Mantica, M.A.Stoyer, H.L.Ravn, for the ISOLDE IS333 and Rochester CHICO/Gammasphere Collaborations Structure of neutron-rich even-even 124, 126Cd RADIOACTIVITY 124,126Ag(β-); measured Eγ, Iγ, γγ-coin following decay of mass-separated sources. 124,126Cd deduced levels, J, π. Comparison with shell-model predictions.
doi: 10.1140/epjad/i2005-06-197-6
2005MO30 Nucl.Phys. A758, 643c (2005) F.Montes, H.Schatz, A.Aprahamian, O.Arndt, A.Estrade, K.-L.Kratz, S.N.Liddick, P.F.Mantica, W.F.Mueller, P.Hosmer, A.C.Morton, M.Ouellette, E.Pellegrini, B.Pfeiffer, P.Reeder, P.Santi, A.Stolz, B.E.Tomlin, W.B.Walters, A.Wohr β-Decay Studies Close to the N=82 r-process Path RADIOACTIVITY 119Rh(β-) [from Be(136Xe, X)]; measured T1/2.
doi: 10.1016/j.nuclphysa.2005.05.188
2005PO22 Eur.Phys.J. A 25, Supplement 1, 451 (2005) G.Popa, A.Aprahamian, A.Georgieva, J.P.Draayer Systematics in the structure of low-lying, non-yrast band-head configurations of strongly deformed nuclei NUCLEAR STRUCTURE 152Nd, 156Sm, 156,160Gd, 160,164Dy, 164,168Er, 168,172Yb, 172,176Hf; calculated band-head energies, collective properties. Pseudo-SU(3) model.
doi: 10.1140/epjad/i2005-06-140-y
2005RO37 Nucl.Instrum.Methods Phys.Res. B241, 977 (2005) G.V.Rogachev, A.A.Aprahamian, F.D.Becchetti, P.Boutachkov, Y.Chen, G.Chubarian, P.A.DeYoung, A.Fomichev, V.Z.Goldberg, M.S.Golovkov, J.J.Kolata, Yu.Ts.Oganessian, G.F.Peaslee, M.Quinn, A.Rodin, B.B.Skorodumov, R.S.Slepnev, G.Ter-Akopian, W.H.Trzaska, A.Wohr, R.Wolski Isobaric analog states as a tool for spectroscopy of exotic nuclei NUCLEAR REACTIONS 1H(8He, 8He), E not given; measured recoil proton spectrum; deduced excitation function. 1H(6He, 6Li), E not given; measured neutron spectrum, nγ-coin; deduced excitation function. 7,9Li deduced resonance parameters. 7,9He deduced analog states features.
doi: 10.1016/j.nimb.2005.07.157
2005SC28 Eur.Phys.J. A 25, Supplement 1, 639 (2005) H.Schatz, P.T.Hosmer, A.Aprahamian, O.Arndt, R.R.C.Clement, A.Estrade, K.-L.Kratz, S.N.Liddick, P.F.Mantica, W.F.Mueller, F.Montes, A.C.Morton, M.Ouellette, E.Pellegrini, B.Pfeiffer, P.Reeder, P.Santi, M.Steiner, A.Stolz, B.E.Tomlin, W.B.Walters, A.Wohr The half-life of the doubly-magic r-process nucleus 78Ni RADIOACTIVITY 78Ni(β-) [from 86Kr fragmentation]; measured T1/2. Comparison with model predictions, astrophysical implications discussed.
doi: 10.1140/epjad/i2005-06-069-1
2005SH49 Eur.Phys.J. A 25, 387 (2005) T.M.Shneidman, R.V.Jolos, R.Krucken, A.Aprahamian, D.Cline, J.R.Cooper, M.Cromaz, R.M.Clark, C.Hutter, A.O.Macchiavelli, W.Scheid, M.A.Stoyer, C.Y.Wu E2 transitions between positive- and negative-parity states of the ground-state alternating-parity bands RADIOACTIVITY 252Cf(SF); measured Doppler-shifted Eγ, Iγ, γγ-, (fragment)γ-coin. 144Ba deduced transitions T1/2, B(E2), transition dipole, quadrupole, and octupole moments for alternating-parity band. Gammasphere array, cluster-model analysis.
doi: 10.1140/epja/i2005-10134-y
2005SU20 Nucl.Phys. A758, 765c (2005) Y.Sun, M.Wiescher, A.Aprahamian, J.Fisker Nuclear structure of the exotic mass region along the rp process path NUCLEAR STRUCTURE 68Se, 72Kr; calculated levels, J, π, deformation, isomeric states features. Astrophysical implications discussed.
doi: 10.1016/j.nuclphysa.2005.05.138
2004AP02 Nucl.Phys. A731, 291 (2004) From ripples to tidal waves: Low lying vibrational motion in nuclei NUCLEAR REACTIONS 155Gd, 177Hf(n, γ), E=thermal; measured Eγ, Iγ. 160Gd(p, t), E not given; measured triton spectra. 156,158Gd, 178Hf deduced transition strengths, vibrational features.
doi: 10.1016/j.nuclphysa.2003.11.040
2004AP07 Yad.Fiz. 67, 1777 (2004); Phys.Atomic Nuclei 67, 1750 (2004) The Nature of Low-Lying Kπ = 0+ Bands in Nuclei NUCLEAR STRUCTURE 178Hf, 156,158Gd; analyzed levels, J, π, B(E2), 0+ excited bands features.
doi: 10.1134/1.1806918
2004GO15 Phys.Rev. C 69, 031302 (2004) V.Z.Goldberg, G.G.Chubarian, G.Tabacaru, L.Trache, R.E.Tribble, A.Aprahamian, G.V.Rogachev, B.B.Skorodumov, X.D.Tang Low-lying levels in 15F and the shell model potential for drip-line nuclei NUCLEAR REACTIONS 1H(14O, 14O), E(cm)=1.0-3.4 MeV; measured excitation functions, σ(θ). 15F deduced ground and excited states J, π, resonance features. Woods-Saxon potential model analysis.
doi: 10.1103/PhysRevC.69.031302
2004GR26 Phys.Rev. C 70, 034316 (2004) C.Granja, S.Pospisil, A.Aprahamian, H.Borner, H.Lehmann, T.von Egidy, H.-F.Wirth, G.Graw, R.Hertenberger, Y.Eisermann, D.Nosek, L.Rubacek, S.A.Telezhnikov Nuclear structure of 159Gd NUCLEAR REACTIONS 158Gd(n, γ), E=thermal; measured Eγ, Iγ. 158Gd(d, p), E=18 MeV; 160Gd(d, t), E=25 MeV; measured Ep, triton spectra, σ(E, θ). 160Gd(polarized d, t), E=22 MeV; measured triton spectra, σ(E, θ), Ay(θ). 160Gd(d, t), E=25 MeV; measured triton spectra. 159Gd deduced levels, J, π, spectroscopic factors, rotational bands, configurations. Comparison with quasiparticle-phonon and quasiparticle-rotor model predictions. Level systematics in neighboring nuclides compared.
doi: 10.1103/PhysRevC.70.034316
2004RO20 Phys.Rev.Lett. 92, 232502 (2004) G.V.Rogachev, P.Boutachkov, A.Aprahamian, F.D.Becchetti, J.P.Bychowski, Y.Chen, G.Chubarian, P.A.DeYoung, V.Z.Goldberg, J.J.Kolata, L.O.Lamm, G.F.Peaslee, M.Quinn, B.B.Skorodumov, A.Wohr Analog States of 7He Observed via the 6He(p, n) Reaction NUCLEAR REACTIONS 1H(6He, n), E=24 MeV; measured En, Eγ, nγ-coin; deduced excitation function. 7Li deduced levels, J, π, analog states. 7He deduced IAR features.
doi: 10.1103/PhysRevLett.92.232502
2004RO42 Nucl.Phys. A746, 229c (2004) G.V.Rogachev, A.Aprahamian, F.D.Becchetti, P.Boutachkov, Y.Chen, G.Chubarian, P.A.DeYoung, A.Fomichev, V.Z.Goldberg, M.S.Golovkov, J.J.Kolata, Yu.Ts.Oganessian, G.F.Peaslee, M.Quinn, A.Rodin, B.B.Skorodumov, R.S.Slepnev, G.Ter-Akopian, W.H.Trzaska, A.Wohr, R.Wolski Structure of exotic 7He and 9He NUCLEAR REACTIONS 1H(6He, n), E(cm) ≈ 1-3.3 MeV; 1H(8He, 8He), E* ≈ 15-20 MeV; measured σ(θ), excitation functions. 7,9Li, 7,9He deduced IAS features.
doi: 10.1016/j.nuclphysa.2004.09.036
2004WO16 Nucl.Phys. A742, 349 (2004) A.Wohr, A.Aprahamian, P.Boutachkov, J.L.Galache, J.Gorres, M.Shawcross, A.Teymurazyan, M.C.Wiescher, D.S.Brenner, C.N.Davids, S.M.Fischer, A.M.Heinz, R.V.F.Janssens, D.Seweryniak The N = Z rp-process waiting-point nucleus 68Se and its astrophysical implications RADIOACTIVITY 68Se(EC), (β+) [from 12C(58Ni, 2n)]; measured Eγ, Eβ, βγ-coin; deduced Q(EC). 68Se deduced mass excess. 68As deduced transitions. Fragment mass analyzer. NUCLEAR REACTIONS 68Se, 69Br(p, γ), E not given; analyzed mass data; deduced reaction Q-values. Astrophysical implications discussed.
doi: 10.1016/j.nuclphysa.2004.06.024
2003BA18 Phys.Rev. C 67, 034310 (2003) C.J.Barton, D.S.Brenner, N.V.Zamfir, M.A.Caprio, A.Aprahamian, M.C.Wiescher, C.W.Beausang, Z.Berant, R.F.Casten, J.R.Cooper, R.L.Gill, R.Krucken, J.R.Novak, N.Pietralla, M.Shawcross, A.Teymurazyan, A.Wolf Mass measurement of 80Y by β-γ coincidence spectroscopy RADIOACTIVITY 80Y(EC), (β+) [from 58Ni(28Si, npα)]; measured Eγ, Eβ, βγ-coin; deduced Q(EC). 80Sr deduced transitions. Implications for astrophysical rp-process simulations discussed.
doi: 10.1103/PhysRevC.67.034310
2003DO01 Phys.Rev. C 67, 014315 (2003) J.Doring, R.A.Kaye, A.Aprahamian, M.W.Cooper, J.Daly, C.N.Davids, R.C.de Haan, J.Gorres, S.R.Lesher, J.J.Ressler, D.Seweryniak, E.J.Stech, A.Susalla, S.L.Tabor, J.Uusitalo, W.B.Walters, M.Wiescher Rotational and vibrational excitations in 84Zr studied through in-beam and 84Nb β-decay spectroscopy NUCLEAR REACTIONS 59Co(28Si, 2np), E=99 MeV; 58Ni(32S, 2pα), E=135 MeV; measured Eγ, Iγ, γγ-coin, angular distributions. 84Zr deduced levels, J, π, rotational and vibrational excitations, deformation. Comparison with level systematics in neighboring nuclides. RADIOACTIVITY 84Nb(EC) [from 58Ni(28Si, np)]; measured Eγ, Iγ, γγ-, βγ-coin, T1/2; deduced log ft. 84Zr deduced levels, J, π. Mass-separated source.
doi: 10.1103/PhysRevC.67.014315
2003HU07 Phys.Rev. C 67, 054315 (2003) C.Hutter, R.Krucken, A.Aprahamian, C.J.Barton, C.W.Beausang, M.A.Caprio, R.F.Casten, W.-T.Chou, R.M.Clark, D.Cline, J.R.Cooper, M.Cromaz, A.A.Hecht, A.O.Macchiavelli, N.Pietralla, M.Shawcross, M.A.Stoyer, C.Y.Wu, N.V.Zamfir B(E2) values and the search for the critical point symmetry X(5) in 104Mo and 106Mo RADIOACTIVITY 252Cf(SF); measured Doppler-shifted Eγ, Iγ, γγ-coin. 104,106Mo deduced levels T1/2, B(E2), transition quadrupole moments. Recoil-distance technique, Gammasphere array, comparison with model predictions.
doi: 10.1103/PhysRevC.67.054315
2003OT02 Nucl.Phys. A721, 1024c (2003) K.Otsuki, G.J.Mathews, T.Kajino, S.Honda, W.Aoki, A.Aprahamian, K.Vaughan Nuclear Cosmochronometry and Universality in the r-Process Abundances
doi: 10.1016/S0375-9474(03)01276-4
2003SU32 Phys.Rev. C 68, 061301 (2003) Y.Sun, A.Aprahamian, J.-y.Zhang, C.-T.Lee Nature of excited 0+ states in 158Gd described by the projected shell model NUCLEAR STRUCTURE 158Gd; calculated 0+ states energies, configurations. Projected shell model, comparisons with data.
doi: 10.1103/PhysRevC.68.061301
2002AP02 Phys.Rev. C65, 031301 (2002) A.Aprahamian, R.C.de Haan, H.G.Borner, H.Lehmann, C.Doll, M.Jentschel, A.M.Bruce, R.Piepenbring Lifetime Measurements of Excited Kπ = 0+ Bands in 178Hf NUCLEAR REACTIONS 177Hf(n, γ), E=thermal; measured Eγ, Iγ, Doppler shifts. 178Hf deduced levels T1/2, B(E2), configurations. Gamma-ray induced Doppler broadening technique, double flat crystal spectrometer.
doi: 10.1103/PhysRevC.65.031301
2002BO55 Eur.Phys.J. A 15, 455 (2002) P.Boutachkov, A.Aprahamian, Y.Sun, J.A.Sheikh, S.Frauendorf In-band and inter-band B(E2) values within the Triaxial Projected Shell Model NUCLEAR STRUCTURE 166,168Er; calculated vibrational bands level energies, transitions B(E2). Triaxial projected shell model, comparison with data.
doi: 10.1140/epja/i2002-10051-7
2002LE34 Phys.Rev. C 66, 051305 (2002) S.R.Lesher, A.Aprahamian, L.Trache, A.Oros-Peusquens, S.Deyliz, A.Gollwitzer, R.Hertenberger, B.D.Valnion, G.Graw New 0+ states in 158Gd NUCLEAR REACTIONS 160Gd(p, t), E=27 MeV; measured triton spectra, σ(θ). 158Gd deduced levels, J, π, several 0+ states.
doi: 10.1103/PhysRevC.66.051305
2002PF01 Phys.Rev. C65, 064604 (2002) M.Pfutzner, P.H.Regan, P.M.Walker, M.Caamano, J.Gerl, M.Hellstrom, P.Mayet, K.-H.Schmidt, Zs.Podolyak, M.N.Mineva, A.Aprahamian, J.Benlliure, A.M.Bruce, P.A.Butler, D.Cortina Gil, D.M.Cullen, J.Doring, T.Enqvist, C.Fox, J.Garces Narro, H.Geissel, W.Gelletly, J.Giovinazzo, M.Gorska, H.Grawe, R.Grzywacz, A.Kleinbohl, W.Korten, M.Lewitowicz, R.Lucas, H.Mach, C.D.O'Leary, F.De Oliveira, C.J.Pearson, F.Rejmund, M.Rejmund, M.Sawicka, H.Schaffner, Ch.Schlegel, K.Schmidt, Ch.Theisen, F.Vives, D.D.Warner, C.Wheldon, H.J.Wollersheim, S.Wooding Angular Momentum Population in the Fragmentation of 208Pb at 1 GeV/nucleon NUCLEAR REACTIONS Be(208Pb, X), E=1 GeV/nucleon; measured fragment yields, delayed Eγ, Iγ, (fragment)γ-coin; deduced isomeric ratios. 174,175,176Hf, 175,176,179,180Ta, 180,181,182W, 181,185Re deduced transitions, isomers T1/2, angular momentum distributions. Fragment separator.
doi: 10.1103/PhysRevC.65.064604
2002VI08 Nucl.Instrum.Methods Phys.Res. A491, 426 (2002) S.M.Vincent, A.Aprahamian, J.J.Kolata, L.O.Lamm, V.Guimaraes, R.C.deHaan, D.Peterson, P.Santi, A.Teymurazyan, F.D.Becchetti, T.W.O'Donnell, M.Lee, D.A.Roberts, J.A.Zimmerman, J.A.Brown Gamma-ray spectroscopy with a low-energy 6He radioactive ion beam NUCLEAR REACTIONS 63Cu(6He, 2np), E=28 MeV; measured Eγ, Iγ, γγ-coin; deduced σ. 66Zn deduced levels, J, π.
doi: 10.1016/S0168-9002(02)01272-X
2001AP05 Hyperfine Interactions 132, 417 (2001) A.Aprahamian, A.Teymurazyan, A.Susalla, N.Cuka From Exploding Stars to the Laboratory: Nucleosynthesis in the rp-process NUCLEAR STRUCTURE Z=28-50; calculated deformation parameters, masses. Semi-empirical approach, astrophysical implications discussed.
doi: 10.1023/A:1011927825975
2001SC21 Phys.Rev.Lett. 86, 3471 (2001) H.Schatz, A.Aprahamian, V.Barnard, L.Bildsten, A.Cumming, M.Ouellette, T.Rauscher, F.-K.Thielemann, M.Wiescher End Point of the rp Process on Accreting Neutron Stars NUCLEAR STRUCTURE Z=27-54; calculated astrophysical abundances; deduced rp-process endpoint.
doi: 10.1103/PhysRevLett.86.3471
2001SC29 Nucl.Phys. A688, 150c (2001) H.Schatz, A.Aprahamian, V.Barnard, L.Bildsten, A.Cumming, M.Ouellette, T.Rauscher, F.-K.Thielemann, M.Wiescher The Endpoint of the rp-Process on Accreting Neutron Stars
doi: 10.1016/S0375-9474(01)00688-1
2000AL02 Phys.Rev. C61, 031303 (2000) A.Algora, G.de Angelis, F.Brandolini, R.Wyss, A.Gadea, E.Farnea, W.Gelletly, S.Lunardi, D.Bazzacco, C.Fahlander, A.Aprahamian, F.Becker, P.G.Bizzeti, A.Bizzeti-Sona, D.de Acuna, M.De Poli, J.Eberth, D.Foltescu, S.M.Lenzi, T.Martinez, D.R.Napoli, P.Pavan, C.M.Petrache, C.Rossi Alvarez, D.Rudolph, B.Rubio, S.Skoda, P.Spolaore, R.Menegazzo, H.G.Thomas, C.A.Ur Pronounced Shape Change Induced by Quasiparticle Alignment NUCLEAR REACTIONS 40Ca(40Ca, 2pα), E=160 MeV; measured Eγ, Iγ, γγ-coin, DSA. 74Kr deduced high-spin levels T1/2, B(E2), transition quadrupole moments, deformation vs spin. GASP array. Cranked mean-field calculations.
doi: 10.1103/PhysRevC.61.031303
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