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Search: Author = A.Aprahamian

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


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


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


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
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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
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14632. Data from this article have been entered in the XUNDL database. For more information, click here.


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
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2600. Data from this article have been entered in the XUNDL database. For more information, click here.


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


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
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14685. Data from this article have been entered in the XUNDL database. For more information, click here.


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


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


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


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
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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
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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
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Data from this article have been entered in the EXFOR database. For more information, access X4 dataset14519. Data from this article have been entered in the XUNDL database. For more information, click here.


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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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2005AP06      Nat.Phys. 1, 81 (2005)

A.Aprahamian, Y.Sun

Nuclear physics: Long live isomer research

doi: 10.1038/nphys150
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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2004AP02      Nucl.Phys. A731, 291 (2004)

A.Aprahamian

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
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2004AP07      Yad.Fiz. 67, 1777 (2004); Phys.Atomic Nuclei 67, 1750 (2004)

A.Aprahamian

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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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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