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NSR database version of April 11, 2024.

Search: Author = W.B.Walters

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2023AY02      Phys.Rev. C 107, 044314 (2023)

A.D.Ayangeakaa, R.V.F.Janssens, S.Zhu, J.M.Allmond, B.A.Brown, C.Y.Wu, M.Albers, K.Auranen, B.Bucher, M.P.Carpenter, P.Chowdhury, D.Cline, H.L.Crawford, P.Fallon, A.M.Forney, A.Gade, D.J.Hartley, A.B.Hayes, J.Henderson, F.G.Kondev, Krishichayan, T.Lauritsen, J.Li, D.Little, A.O.Macchiavelli, D.Rhodes, D.Seweryniak, S.M.Stolze, W.B.Walters, J.Wu

Triaxiality and the nature of low-energy excitations in 76Ge

NUCLEAR REACTIONS 208Pb(76Ge, 76Ge'), E=291, 304, 317 MeV; measured Eγ, Iγ, (76Ge)γ-coin using the GRETINA array with 28 Ge crystals in one experiment at 304-MeV beam energy, and 42 Ge crystals in a second experiment at 291- and 317-MeV beam energies, both in coincidence with scattered particles detected by using the CHICO2 array of position-sensitive parallel plate avalanche counters at the ATLAS-ANL facility. 76Ge; deduced levels, Jπ, γ-ray and Coulomb excitation yields analyzed by using the semiclassical, coupled-channel, Coulomb excitation least-squares code GOSIA, constrained by certain previouly known experimental nuclear structure parameters, E2, M1, E1 and E3 matrix elements, B(E2), B(M1), B(E1) and B(E3), spectroscopic quadrupole moments for five excited states, and evidence for rigid triaxial deformation at low excitation energies in 76Ge, and magnitudes of the quadrupole invariants Q+2, and expectation values of the quadrupole asymmetry parameters cos(3γ) for the members of the ground-state and the γ bands. Comparison with configuration interaction shell-model calculations and generalized triaxial rotor model, and with previous experimental data.

doi: 10.1103/PhysRevC.107.044314
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2023CR03      Nucl.Instrum.Methods Phys.Res. A1055, 168525 (2023)

B.P.Crider, C.J.Prokop, S.N.Liddick, H.M.Albers, M.Alshudifat, A.D.Ayangeakaa, M.P.Carpenter, J.J.Carroll, J.Chen, C.J.Chiara, A.C.Dombos, S.Go, R.Grzywacz, J.Harker, R.V.F.Janssens, N.Larson, T.Lauritsen, R.Lewis, S.J.Quinn, F.Recchia, D.Seweryniak, A.Spyrou, S.Suchyta, W.B.Walters, S.Zhu

New method for level-lifetime measurements with thick scintillators

NUCLEAR REACTIONS 9Be(76Ge, X)68Ni/68Zn/69Ni/70Ni, E=140 MeV/nucleon; measured reaction products, Eγ, Iγ, Eβ, Iβ, βγ-coin.; deduced γ-ray energies, level T1/2. Comparison with available data. The National Superconducting Cyclotron Laboratory (NSCL), the coupled cyclotron facility.

doi: 10.1016/j.nima.2023.168525
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Data from this article have been entered in the XUNDL database. For more information, click here.


2022LI54      Phys.Rev. C 106, 044313 (2022)

D.Little, A.D.Ayangeakaa, R.V.F.Janssens, S.Zhu, Y.Tsunoda, T.Otsuka, B.A.Brown, M.P.Carpenter, A.Gade, D.Rhodes, C.R.Hoffman, F.G.Kondev, T.Lauritsen, D.Seweryniak, J.Wu, J.Henderson, C.Y.Wu, P.Chowdhury, P.C.Bender, A.M.Forney, W.B.Walters

Multistep Coulomb excitation of 64Ni: Shape coexistence and nature of low-spin excitations

NUCLEAR REACTIONS 208Pb(64Ni, 64Ni'), E=272 MeV; measured reaction products, time-of-flight difference between the projectile and target recoils as a function of scattering angle, Eγ, Iγ, (particle)γ-coin, Coulomb-excitation yields using GRETINA array with 12 modules of 48 highly-segmented coaxial HPGe crystals for γ detection, and CHICO2 array of 20 position-sensitive parallel-plate avalanche counters for the detection of scattered particles at the ATLAS-ANL facility. Multistep safe Coulomb-excitation. 64Ni; deduced levels, J, π, E2 matrix elements using GOSIA least-squares fitting code, B(E2), spectroscopic electric quadrupole moments, evidence for triple shape coexistence. Comparison with previous experimental results, and with Monte Carlo shell-model (MCSM), and conventional shell-model calculations.

NUCLEAR STRUCTURE 64Ni; calculated levels, J, π, B(E2), spectroscopic quadrupole moments, proton and neutron orbital occupancies for 2+ and 0+ states using Monte Carlo shell-model (MCSM), and conventional shell-model calculations with the jj44 and fp effective interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.106.044313
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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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2020DE09      Phys.Rev. C 101, 034612 (2020)

V.V.Desai, A.Pica, W.Loveland, J.S.Barrett, E.A.McCutchan, S.Zhu, A.D.Ayangeakaa, M.P.Carpenter, J.P.Greene, T.Lauritsen, R.V.F.Janssens, B.M.S.Amro, W.B.Walters

Multinucleon transfer in the interaction of 977 MeV and 1143 MeV 204Hg with 208Pb

NUCLEAR REACTIONS 208Pb(204Hg, X)72Ga/81mRb/85Kr/91Sr/92Sr/97Zr/90Nb/99Mo/93Tc/99Tc/97Ru/103Ru/112Ag/115Cd/117Sb/131I/125Xe/135Xe/140Ba/143Ce/156Sm/154Tb/167Ho/169Lu/180mHf/181Re/182Re/188Re/191Os/188Ir/190Ir/195Pt/192Au/193Au/194Au/196Au/198Au/199Au/200mAu/195mHg/197Hg/203Hg/198Tl/199Tl/200Tl/201Tl/202Tl/200Pb/201Pb/202mPb/203Pb/204Pb/202Bi/203Bi/204Bi/205Bi/206Bi/206Po/208At/209At/210At/211Rn, E=977 MeV; 208Pb(204Hg, X)69Zn/72Zn/82Br/86Y/87Y/91Sr/96Nb/95Tc/96Tc/97Zr/97Ru/99Mo/101Rh/103Ru/105Ru/111In/115Cd/117Sb/120mSb/122Sb/128Sb/132Cs/135mBa/140Ba/143Ce/147Gd/172Er/165Tm/169Lu/171Lu/170Hf/173Hf/180mHf/176Ta/177Ta/178Ta/183Ta/181Re/182Re/188Re/189Re/183Os/185Os/186Ir/188Ir/190Ir/188Pt/191Pt/197mPt/193Au/194Au/196Au/198Au/199Au/200mAu/193mHg/195mHg/197Hg/203Hg/197Tl/199Tl/200Tl/201Tl/202Tl/200Pb/201Pb/202mPb/203Pb/203Bi/204Bi/205Bi/206Bi/206Po/207Po/209At/210At/211Rn, E=1143 MeV; measured Eγ, Iγ, fragment cumulative and independent σ for nuclei produced in multi-nucleon transfer (MNT) reactions using Gammasphere array for off-line γ counting at ANT-ATLAS facility. Comparison with theoretical predictions of GRAZING-F, dinuclear systems (DNS), and improved quantum molecular dynamics (ImQMD) models, and with previous experimental results from MNT reactions: 248Cm(16O, X), (86Kr, X), (129Xe, X), (132Xe, X), (136Xe, X), 197Au(238U, X), 238U(18O, X), (238U, X), 208Pb(18O, X), (64Ni, X), (136Xe, X), 198Pt(136Xe, X). No evidence for production of nuclei near the N=126 shell.

doi: 10.1103/PhysRevC.101.034612
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2515.


2020MA37      Phys.Rev.Lett. 125, 102502 (2020)

N.Marginean, D.Little, Y.Tsunoda, S.Leoni, R.V.F.Janssens, B.Fornal, T.Otsuka, C.Michelagnoli, L.Stan, F.C.L.Crespi, C.Costache, R.Lica, M.Sferrazza, A.Turturica, A.D.Ayangeakaa, K.Auranen, M.Barani, P.C.Bender, S.Bottoni, M.Boromiza, A.Bracco, S.Calinescu, C.M.Campbell, M.P.Carpenter, P.Chowdhury, M.Ciemala, N.Cieplicka-Orynczak, D.Cline, C.Clisu, H.L.Crawford, I.E.Dinescu, J.Dudouet, D.Filipescu, N.Florea, A.M.Forney, S.Fracassetti, A.Gade, I.Gheorghe, A.B.Hayes, I.Harca, J.Henderson, A.Ionescu, L.W.Iskra, M.Jentschel, F.Kandzia, Y.H.Kim, F.G.Kondev, G.Korschinek, U.Koster, Krishichayan, M.Krzysiek, T.Lauritsen, J.Li, R.Marginean, E.A.Maugeri, C.Mihai, R.E.Mihai, A.Mitu, P.Mutti, A.Negret, C.R.Nita, A.Olacel, A.Oprea, S.Pascu, C.Petrone, C.Porzio, D.Rhodes, D.Seweryniak, D.Schumann, C.Sotty, S.M.Stolze, R.Suvaila, S.Toma, S.Ujeniuc, W.B.Walters, C.Y.Wu, J.Wu, S.Zhu, S.Ziliani

Shape Coexistence at Zero Spin in 64Ni Driven by the Monopole Tensor Interaction

NUCLEAR REACTIONS 62Ni(18O, 16O), E=39 MeV; 65Cu(11B, 12C), E=26 MeV; 63Ni(n, γ), E thermal; measured reaction products, Eγ, Iγ; analyzed available data from multiple experiments. 64Ni; deduced γ-ray energies, J, π, B(E2). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.102502
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Data from this article have been entered in the XUNDL database. For more information, click here.


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


2020SE02      Phys.Rev.Lett. 124, 052501 (2020)

N.Sensharma, U.Garg, Q.B.Chen, S.Frauendorf, D.P.Burdette, J.L.Cozzi, K.B.Howard, S.Zhu, M.P.Carpenter, P.Copp, F.G.Kondev, T.Lauritsen, J.Li, D.Seweryniak, J.Wu, A.D.Ayangeakaa, D.J.Hartley, R.V.F.Janssens, A.M.Forney, W.B.Walters, S.S.Ghugre, R.Palit

Longitudinal Wobbling Motion in 187Au

NUCLEAR REACTIONS 174Yb(19F, X)187Au, E=105, 115 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π, yrast band, B(M1)/B(E2). Comparison with PRM calculations.

doi: 10.1103/PhysRevLett.124.052501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019AU02      Phys.Lett. B 792, 187 (2019)

K.Auranen, D.Seweryniak, M.Albers, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, C.J.Chiara, P.Copp, H.M.David, D.T.Doherty, J.Harker, C.R.Hoffman, R.V.F.Janssens, T.L.Khoo, S.A.Kuvin, T.Lauritsen, G.Lotay, A.M.Rogers, C.Scholey, J.Sethi, R.Talwar, W.B.Walters, P.J.Woods, S.Zhu

Proton decay of 108I and its significance for the termination of the astrophysical rp-process

RADIOACTIVITY 108I(α), (p), 109I(p), 107,108Te(α) [from 54Fe(58Ni, X)108I/109I/108Te/107Te, E=254 MeV]; measured Eα, Iα, Ep, Ip; deduced Q-values, T1/2, mass excesses, branching ratio. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2019.03.039
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019AY04      Phys.Rev.Lett. 123, 102501 (2019)

A.D.Ayangeakaa, R.V.F.Janssens, S.Zhu, D.Little, J.Henderson, C.Y.Wu, D.J.Hartley, M.Albers, K.Auranen, B.Bucher, M.P.Carpenter, P.Chowdhury, D.Cline, H.L.Crawford, P.Fallon, A.M.Forney, A.Gade, A.B.Hayes, F.G.Kondev, Krishichayan, T.Lauritsen, J.Li, A.O.Macchiavelli, D.Rhodes, D.Seweryniak, S.M.Stolze, W.B.Walters, J.Wu

Evidence for Rigid Triaxial Deformation in 76Ge from a Model-Independent Analysis

NUCLEAR REACTIONS 208Pb(76Ge, 76Ge'), E=304, 291, 317 MeV; measured reaction products, Eγ, Iγ. 76Ge; deduced γ-ray energies, E2 matrix elements, quadrupole asymmetry for bands, triaxial deformation.

doi: 10.1103/physrevlett.123.102501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019EL08      Phys.Rev. C 100, 034317 (2019)

B.Elman, A.Gade, R.V.F.Janssens, A.D.Ayangeakaa, D.Bazin, J.Belarge, P.C.Bender, B.A.Brown, C.M.Campbell, M.P.Carpenter, H.L.Crawford, B.P.Crider, P.Fallon, A.M.Forney, J.Harker, S.N.Liddick, B.Longfellow, E.Lunderberg, C.J.Prokop, J.Sethi, R.Taniuchi, W.B.Walters, D.Weisshaar, S.Zhu

Probing the role of proton cross-shell excitations in 70Ni using nucleon knockout reactions

NUCLEAR REACTIONS 9Be(71Cu, 70Ni), E=80.2 MeV/nucleon; 9Be(71Ni, 70Ni), E=82.6 MeV/nucleon; 9Be(72Zn, 70Ni), E=76.5 MeV/nucleon, [secondary 71Cu, 71Ni, 71Zn beams from 9Be(76Ge, X), E=130 MeV/nucleon primary reaction at the K500 and K1200 coupled cyclotrons of NSCL-MSU]; measured yields of reaction products, Eγ, Iγ, γγ- and (knockout residues)γ-coin using GRETINA array for γ detection, and CsI(Na) hodoscope array for reaction residues. 70Ni; deduced levels, J, π, configurations. Comparison with shell-model calculations for only the neutron excitations using the jj44pna effective interaction.

doi: 10.1103/PhysRevC.100.034317
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Data from this article have been entered in the XUNDL database. For more information, click here.


2019IS03      Phys.Lett. B 788, 396 (2019)

L.W.Iskra, R.Broda, R.V.F.Janssens, M.P.Carpenter, B.Fornal, T.Lauritsen, T.Otsuka, T.Togashi, Y.Tsunoda, W.B.Walters, S.Zhu

Revised B(E3) transition rate and structure of the 3 - level in 96Zr

NUCLEAR STRUCTURE 96Zr; analyzed available data; deduced reduced value of B(E3) compared to the previous reports; calculated the collectivity of the octupole vibration arises from both proton and neutron excitations involving a large number of orbitals using the Monte Carlo shell-model.

NUCLEAR REACTIONS 238U(76Ge, X), (64Ni, X), (48Ca, X), (208Pb, X)96Zr, 208Pb, 198Pt(76Ge, X)96Zr, E not given; measured reaction products, Eγ, Iγ; deduced γ-ray relative intensities, B(E3), branching ratios.

doi: 10.1016/j.physletb.2018.10.069
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Data from this article have been entered in the XUNDL database. For more information, click here.


2018AU04      Phys.Rev.Lett. 121, 182501 (2018)

K.Auranen, D.Seweryniak, M.Albers, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, C.J.Chiara, P.Copp, H.M.David, D.T.Doherty, J.Harker, C.R.Hoffman, R.V.F.Janssens, T.L.Khoo, S.A.Kuvin, T.Lauritsen, G.Lotay, A.M.Rogers, J.Sethi, C.Scholey, R.Talwar, W.B.Walters, P.J.Woods, S.Zhu

Superallowed α Decay to Doubly Magic 100Sn

RADIOACTIVITY 108Xe, 104Te(α) [from 54Fe(58Ni, 4n)108Xe, E=245 MeV]; measured decay products, Eα, Iα; deduced α-particles energies, T1/2. A heavy self-conjugate nucleus, comparison with available data.

doi: 10.1103/PhysRevLett.121.182501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2018BR15      Phys.Rev. C 98, 024324 (2018)

R.Broda, L.W.Iskra, R.V.F.Janssens, B.A.Brown, B.Fornal, J.Wrzesinski, N.Cieplicka-Orynczak, M.P.Carpenter, C.J.Chiara, C.R.Hoffman, F.G.Kondev, G.J.Lane, T.Lauritsen, Zs.Podolyak, D.Seweryniak, W.B.Walters, S.Zhu

Two-neutron and core-excited states in 210Pb: Tracing E collectivity and evidence for a new β-decaying isomer in 210Tl

NUCLEAR REACTIONS 208Pb(208Pb, X)210Pb, E=1440 MeV; 208Pb(48Ca, X)210Pb, 208Pb(76Ge, X)210Pb, 208Pb(82Se, X)210Pb, 238U(48Ca, X)210Pb, 238U(208Pb, X)210Pb, E=15-25% above the respective Coulomb barriers; measured Eγ, Iγ, delayed γ spectra, γγ-coin, γ(θ), half-lives of isomers and levels by γγ(t), ratio of observed production yields of anticipated 11+ β--decaying isomer in 210Tl and the 8+ isomer in 210Pb using Gammasphere array at ATLAS-ANL facility. 210Pb; deduced high-spin levels, isomers, J, π, conversion coefficients, multipolarities, configurations, B(E2), B(E3). 210Tl; deduced possible 11+ β- decaying isomer. Comparison with large-scale shell model calculations.

NUCLEAR STRUCTURE 210Pb, 210Tl; calculated levels, J, π by large-scale shell model calculations, and compared with experimental data.

doi: 10.1103/PhysRevC.98.024324
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2018FO11      Phys.Rev.Lett. 120, 212501 (2018)

A.M.Forney, W.B.Walters, C.J.Chiara, R.V.F.Janssens, A.D.Ayangeakaa, J.Sethi, J.Harker, M.Alcorta, M.P.Carpenter, G.Gurdal, C.R.Hoffman, B.P.Kay, F.G.Kondev, T.Lauritsen, C.J.Lister, E.A.McCutchan, A.M.Rogers, D.Seweryniak, I.Stefanescu, S.Zhu

Novel ΔJ = 1 Sequence in 78Ge: Possible Evidence for Triaxiality

NUCLEAR REACTIONS 238U(76Ge, X)78Ge, E=530 MeV; 198Pt, 208Pb(76Ge, X)78Ge, E=450 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, B(E2). Comparison with available data and calculations.

doi: 10.1103/PhysRevLett.120.212501
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Data from this article have been entered in the XUNDL database. For more information, click here.


2018PI07      Acta Phys.Pol. B49, 523 (2018)

M.Piersa, A.Korgul, L.M.Fraile, J.Benito, E.Adamska, R.Alvarez, A.E.Barzakh, G.Benzoni, T.Berry, M.J.G.Borge, M.Carmona, K.Chrysalidis, G.Correia, C.Costache, T.Day Goodacre, D.V.Fedorov, V.N.Fedosseev, G.Fernandez-Martinez, M.Fila, D.Galaviz, R.Grzywacz, C.Henrich, A.Illana, Z.Janas, K.Johnston, V.Karanyonchev, M.Kicinska-Habior, R.Lica, M.Madurga, I.Marroquin, B.Marsh, C.Martinez, C.Mazzocchi, K.Miernik, R.Mihai, B.Olaizola, S.Paulaskalas, J.-M.Regis, S.Rothe, V.Sanchez-Tembleque, G.Simpson, Ch.Sotty, L.Stan, M.Stanoiu, M.Stryjczyk, A.Turturica, J.M.Udias, V.Vedia, A.Villa, W.B.Walters

Investigation of Low-lying States in 133Sn Populated in the β Decay of 133In Using Isomer-selective Laser Ionization

RADIOACTIVITY 133In(β-)[from ISOLDE facility, where 1.4 GeV protons are directed on uranium carbide target]; measured Eβ, Iβ, β-gated γ-ray spectra using isomer selective ionization of ISOLDE facility LDE RILIS with clear distinction between decaying gs (9/2+) and isomer (1/2-); deduced, identified γ-rays following 133In to 133Sn as βγγ coin with 513 keV transition; deduced levels, J, π participating in 133In β-decay; deduced consistency with previous results on low-lying structure in 133Sn.

doi: 10.5506/aphyspolb.49.523
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2018ST18      Phys.Rev. C 98, 064326 (2018)

M.Stryjczyk, Y.Tsunoda, I.G.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, U.Koster, B.A.Marsh, T.Otsuka, D.Pauwels, L.Popescu, D.Radulov, M.D.Seliverstov, A.M.Sjodin, P.Van den Bergh, P.Van Duppen, M.Venhart, W.B.Walters, K.Wimmer

β-decay study of the 66Mn - 66Fe - 66Co - 66Ni decay chain

RADIOACTIVITY 66Mn(β-), (β-n)[from U(p, F), Mn beam purified by laser resonance ionization and mass separation]; 66Fe(β-)[from 66Mn β- decay]; 66Co(β-)[from 66Fe β- decay]; measured Eβ, Iβ, Eγ, Iγ, half-lives of β-decaying 66Mn, 66Fe, 66Co, γγ- and βγγ-coin, half-lives of isomers in 65Fe, 66Co by γ(t) using plastic scintillators for β detection and MiniBall cluster Ge detectors for γ detection at ISOLDE-CERN. 65,66Fe, 66Co, 66Ni; deduced levels, isomers, J, π, β feedings, logft, B(GT) values, %β-n value for the decay of 66Mn. Comparison with Monte Carlo shell model calculations.

NUCLEAR STRUCTURE 66Mn, 66Fe, 66Co, 66Ni; calculated average proton and neutron occupation numbers for selected low-lying positive-parity states, potential energy surface (PES) in (Q0, Q2) plane, levels, J, π, B(M1), B(E2) using Monte Carlo Shell model with the A3DA interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.98.064326
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2017AM01      Phys.Rev. C 95, 014330 (2017)

B.M.S.Amro, C.J.Lister, E.A.McCutchan, W.Loveland, P.Chowdhury, S.Zhu, A.D.Ayangeakaa, J.S.Barrett, M.P.Carpenter, C.J.Chiara, J.P.Greene, J.L.Harker, R.V.F.Janssens, T.Lauritsen, A.A.Sonzogni, W.B.Walters, R.Yanez

γ-ray spectroscopy of 209Tl

NUCLEAR REACTIONS 208Pb(136Xe, X)209Tl, E=785 MeV; measured Eγ, Iγ, γΓ-coin, delayed γ, half-lives of isomers using Gammasphere array at ATLAS-ANL facility. 209Tl; deduced levels, J, π, internal conversion coefficients, multipolarities, B(E2), configurations.

doi: 10.1103/PhysRevC.95.014330
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2017BO23      Phys.Lett. B 775, 271 (2017)

S.Bottoni, S.Zhu, R.V.F.Janssens, M.P.Carpenter, Y.Tsunoda, T.Otsuka, A.O.Macchiavelli, D.Cline, C.Y.Wu, A.D.Ayangeakaa, B.Bucher, M.Q.Buckner, C.M.Campbell, C.J.Chiara, H.L.Crawford, M.Cromaz, H.M.David, P.Fallon, A.Gade, J.P.Greene, J.Harker, A.B.Hayes, C.R.Hoffman, B.P.Kay, A.Korichi, T.Lauritsen, J.Sethi, D.Seweryniak, W.B.Walters, D.Weisshaar, A.Wiens

Nucleon correlations and the structure of 7130Zn41

NUCLEAR REACTIONS 70Zn(48Ca, 47Ca)71Zn, E=170 MeV; 197Au(70Zn, X)71Zn, E=430 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, decay scheme, J, π, modest oblate deformation. Comparison with Monte-Carlo shell-model calculations.

doi: 10.1016/j.physletb.2017.11.003
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2017BR08      Phys.Rev. C 95, 064308 (2017)

R.Broda, R.V.F.Janssens, L.W.Iskra, J.Wrzesinski, B.Fornal, M.P.Carpenter, C.J.Chiara, N.Cieplicka-Orynczak, C.R.Hoffman, F.G.Kondev, W.Krolas, T.Lauritsen, Zs.Podolyak, D.Seweryniak, C.M.Shand, B.Szpak, W.B.Walters, S.Zhu, B.A.Brown

Doubly magic 208Pb: High-spin states, isomers, and E3 collectivity in the yrast decay

NUCLEAR REACTIONS 208Pb(48Ca, X), E=430 MeV; 208Pb(208Pb, X), E=1440 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ), half-lives of isomers by γγ(t), in-beam and off-beam Iγ using Gammasphere array at ATLAS-ANL facility. 208Pb; deduced high-spin levels, new isomers, J, π, total electron-conversion coefficients from intensity balances, multipolarities, mixing ratios, B(E1), B(E2), B(E3), B(M1), B(M2), 1p-1h yrast and near-yrast states and their rotational interpretation, 2p-2h states. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.95.064308
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2017EL04      Phys.Rev. C 96, 044332 (2017)

B.Elman, A.Gade, D.Weisshaar, D.Barofsky, D.Bazin, P.C.Bender, M.Bowry, M.Hjorth-Jensen, K.W.Kemper, S.Lipschutz, E.Lunderberg, N.Sachmpazidi, N.Terpstra, W.B.Walters, A.Westerberg, S.J.Williams, K.Wimmer

Quadrupole collectivity beyond N = 50 in neutron-rich Se and Kr isotopes

NUCLEAR REACTIONS 209Bi(88Kr, 88Kr'), E=67 MeV/nucleon; 209Bi(90Kr, 90Kr'), E=68 MeV/nucleon; 209Bi(86Se, 86Se'), E=79 MeV/nucleon, [secondary 88,90Kr, 86Se beams from 9Be(96Zr, X), E=120 MeV/nucleon using A1900 fragment separator at the NSCL-MSU Cyclotron Laboratory]; measured reaction products and particle identification plot, Doppler-corrected Eγ, Iγ, (particle)γ-coin, σ, using the CAESAR array of 192 CsI(Na) scintillators. 88,90Kr, 86Se; deduced levels, J, π, Coulomb excitation yields, B(E2) for excited 2+ states. Comparison with shell-model calculations. 88,90Kr, 86Se; calculated shell-model occupations of the proton and neutron orbitals for the observed levels. Systematics of B(E2) values for the first 2+ states in N=36-60 Kr and Se nuclei.

doi: 10.1103/PhysRevC.96.044332
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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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2017WE06      Phys.Lett. B 771, 119 (2017)

T.Welsh, W.Loveland, R.Yanez, J.S.Barrett, E.A.McCutchan, A.A.Sonzogni, T.Johnson, S.Zhu, J.P.Greene, A.D.Ayangeakaa, M.P.Carpenter, T.Lauritsen, J.L.Harker, W.B.Walters, B.M.S.Amro, P.Copp

Modeling multi-nucleon transfer in symmetric collisions of massive nuclei

NUCLEAR REACTIONS 198Pt(204Hg, X), E=1360 MeV; measured reaction products, Eγ, Iγ; deduced fragment yields, σ. Comparison with GRAZING and DNS models.

doi: 10.1016/j.physletb.2017.05.044
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2016CR05      Phys.Lett. B 763, 108 (2016)

B.P.Crider, C.J.Prokop, S.N.Liddick, M.Al-Shudifat, A.D.Ayangeakaa, M.P.Carpenter, J.J.Carroll, J.Chen, C.J.Chiara, H.M.David, A.C.Dombos, S.Go, R.Grzywacz, J.Harker, R.V.F.Janssens, N.Larson, T.Lauritsen, R.Lewis, S.J.Quinn, F.Recchia, A.Spyrou, S.Suchyta, W.B.Walters, S.Zhu

Shape coexistence from lifetime and branching-ratio measurements in 68, 70Ni

RADIOACTIVITY 70Co, 68Fe, 68Co(β-) [from 9Be(76Ge, X)70Co/68Fe]; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, T1/2, branching ratios, B(E2).

doi: 10.1016/j.physletb.2016.10.020
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2016IS03      Phys.Rev. C 93, 014303 (2016)

L.W.Iskra, R.Broda, R.V.F.Janssens, C.J.Chiara, M.P.Carpenter, B.Fornal, N.Hoteling, F.G.Kondev, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, I.Stefanescu, W.B.Walters, J.Wrzesinski, S.Zhu

Shell-model states with seniority ν = 3, 5, and 7 in odd-A neutron-rich Sn isotopes

NUCLEAR REACTIONS 208Pb, 238U(48Ca, X), E=330 MeV; 238U(64Ni, F), E=430 MeV; measured Eγ, Iγ, γγ-coin, delayed γγ-coin, isomer half-lives using Gammasphere array at ATLAS-ANL facility. 115,117,119,121,123,125,127,129Sn; measured yields of reaction products. 119,121,123,125Sn; deduced high-spin levels, J, π, multipolarity, high-seniority states, isomers, B(E1), B(E2), B(M2), B(E3). Comparison with shell model calculations with jj55pn interactions. Systematics of yrast levels and B(Eλ) values for 117,119,121,123,125,127,129Sn. Systematics of B(E2) values for 10+ to 8+ and 19/2+ to 15/2+ isomeric transitions in A=116-130 Sn isotopes.

NUCLEAR STRUCTURE 119,121,123,125,127,129Sn; calculated levels, J, π using shell model with jj55pn interaction. Comparison with experimental spectra.

doi: 10.1103/PhysRevC.93.014303
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2016KO15      Phys.Rev.Lett. 116, 122502 (2016)

K.Kolos, D.Miller, R.Grzywacz, H.Iwasaki, M.Al-Shudifat, D.Bazin, C.R.Bingham, T.Braunroth, G.Cerizza, A.Gade, A.Lemasson, S.N.Liddick, M.Madurga, C.Morse, M.Portillo, M.M.Rajabali, F.Recchia, L.L.Riedinger, P.Voss, W.B.Walters, D.Weisshaar, K.Whitmore, K.Wimmer, J.A.Tostevin

Direct Lifetime Measurements of the Excited States in 72Ni

NUCLEAR REACTIONS 9Be(73Cu, p)72Ni, E=102MeV/nucleon; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, lifetimes, B(E2) values. Comparison with nuclear shell model calculations.

doi: 10.1103/PhysRevLett.116.122502
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2016MI02      Phys.Rev. C 93, 014306 (2016)

A.J.Mitchell, C.J.Lister, E.A.McCutchan, M.Albers, A.D.Ayangeakaa, P.F.Bertone, M.P.Carpenter, C.J.Chiara, P.Chowdhury, J.A.Clark, P.Copp, H.M.David, A.Y.Deo, B.DiGiovine, N.D'Olympia, R.Dungan, R.D.Harding, J.Harker, S.S.Hota, R.V.F.Janssens, F.G.Kondev, S.H.Liu, A.V.Ramayya, J.Rissanen, G.Savard, D.Seweryniak, R.Shearman, A.A.Sonzogni, S.L.Tabor, W.B.Walters, E.Wang, S.Zhu

ψ-soft 146Ba and the role of nonaxial shapes at N ≈ 90

RADIOACTIVITY 146Cs(β-)[from 252Cf SF and mass separation at CARIBU-ANL facility]; measured Eγ, Iγ, βγ-, βγγ-coin using SATURN detection system at ANL. 146Ba; deduced levels, J, π, limits of β- branching ratios. Level systematics in even-A N=90 isotones with Z=56-68, and those of g.s., β- and γ-bands in 146Ba, 148Ce, 150Nd. Investigation of nuclear shape transitions. Comparison with interacting boson approximation (IBA) model predictions.

doi: 10.1103/PhysRevC.93.014306
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2015BA20      Phys.Rev. C 91, 064615 (2015)

J.S.Barrett, W.Loveland, R.Yanez, S.Zhu, A.D.Ayangeakaa, M.P.Carpenter, J.P.Greene, R.V.F.Janssens, T.Lauritsen, E.A.McCutchan, A.A.Sonzogni, C.J.Chiara, J.L.Harker, W.B.Walters

136Xe+208Pb reaction: A test of models of multinucleon transfer reactions

NUCLEAR REACTIONS 208Pb(136Xe, X), E=85 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere at ATLAS-ANL facility, σ for projectile-like fragments (PLFs) and target-like fragments (TLFs) by off-line γ-ray spectroscopy for radioactive decay measurements (RD), prompt γ decays recorded during the beam burst (IB), and delayed γ decays recorded between the beam bursts (OB). 116,118Cd, 119,121In, 118,120,122,123,124,126Sn, 119,121,123,125,126,127,128,130Sb, 124,126,128,130,131,132,134Te, 127,128,129,130,131,132,133,135,136I, 128,130,132Xe, 133,134,135,136,137,138Xe, 131,132,133,134,136,137,139,141Cs, 130Ba, 132,134,136,138,139,140,141,142,143Ba, 132,135,136,137,139,140,143La, 136,138,139,140,141,142,143,144,145,146Ce, 139,141,142Pr, 140,142,143,144,145,146,147,148,149Nd, 142,143,145,147,149Pm, 145,146,147,148,149,150,151,152,154Sm, 147,149,151Eu, 152,154,156Gd, 156,158,160,162,164Dy, 160,161Er, 176Yb, 176,178,180,181,182Hf, 179,181Ta, 176,180,182,184,186,187W, 179,185,187Re, 186,188,190,191,192,194,197Os, 188,190,192Ir, 190,191,192,194,196,197,198,200,201,202Pt, 191,192,193,194,196,198,199Au, 194,196,198,200,202,203,204,205,206,208Hg, 196,197,198,199,201,202,203,204,205,206,207Tl, 198,201,202,203,204,206,207,208,209,210,211Pb, 199,201,202,203,204,205,206,207,209,211Bi, 202,204,205,206,207,208,209,210,212,213,214Po, 207,208,209,210,211,213At, 210,211,212,213,214,215,216,218Rn, 211,212,213,215,216Fr, 214Ra; deduced projectile-like fragment cumulative and independent production yields. Comparison with predictions of GRAZING model, and those of Zagrebaev and Greiner model using a quantitative metric. Discussed correlations between TLF and PLF yields.

doi: 10.1103/PhysRevC.91.064615
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2015CH25      Phys.Rev. C 91, 044309 (2015)

C.J.Chiara, D.Weisshaar, R.V.F.Janssens, Y.Tsunoda, T.Otsuka, J.L.Harker, W.B.Walters, F.Recchia, M.Albers, M.Alcorta, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, P.F.Bertone, C.M.Campbell, M.P.Carpenter, J.Chen, H.L.Crawford, H.M.David, D.T.Doherty, A.Gade, C.R.Hoffman, M.Honma, F.G.Kondev, A.Korichi, C.Langer, N.Larson, T.Lauritsen, S.N.Liddick, E.Lunderberg, A.O.Macchiavelli, S.Noji, C.Prokop, A.M.Rogers, D.Seweryniak, N.Shimizu, S.R.Stroberg, S.Suchyta, Y.Utsuno, S.J.Williams, K.Wimmer, S.Zhu

Identification of deformed intruder states in semi-magic 70Ni

NUCLEAR REACTIONS 208Pb(70Zn, X)70Ni, E=440 MeV; measured Eγ, Iγ, prompt- and delayed-γ spectra, γγ-coin, γγ(θ) using Gammasphere array at ATLAS-ANL facility. 9Be(82Se, X)70Ni, E=140 MeV/nucleon; measured Eγ, Iγ, (70Ni)γ-, γγ-coin, prompt and delayed γ rays using S800 spectrograph, GRETINA and CsI(Na) arrays at NSCL-MSU facility. 70Ni; deduced levels, J, π. Comparison with Monte Carlo shell-model calculations.

NUCLEAR STRUCTURE 68,70Ni, 92Mo; calculated levels, J, π, potential-energy surface contours in (Q2, Q4) plane. Shell-model using jj44bpn, jj44pna, JUN45, and JUN45 effective interactions, and Monte Carlo shell-model with A3DA interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.044309
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2015FL01      Phys.Rev. C 91, 034310 (2015)

F.Flavigny, D.Pauwels, D.Radulov, I.J.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, V.S.Ivanov, U.Koster, B.A.Marsh, T.Otsuka, L.Popescu, R.Raabe, M.D.Seliverstov, N.Shimizu, A.M.Sjodin, Y.Tsunoda, P.Van den Bergh, P.Van Duppen, J.Van de Walle, M.Venhart, W.B.Walters, K.Wimmer

Characterization of the low-lying 0+ AND 2+ states in 68Ni via β decay of the low-spin 68Co isomer

RADIOACTIVITY 68Co(β-), (β-n)[from 68Mn -> 68Fe -> 68Co decay chain, 68Mn from 238U(p, F), E=1 GeV]; measured Eγ, Iγ, βγ-, γγ-coin, half-life of first excited 0+ state by βγ(t) using RILIS and Miniball array at ISOLDE-CERN facility. 68Ni; deduced levels, J, π, β feedings, logft, E0 decays, delayed neutron emission probability Pn, B(E2), configuration. Comparison with previous results, and with Monte Carlo shell model (MCSM) calculations. 67,68Fe, 67Co, 68Ga, 136I(β-); detected γ rays.

NUCLEAR STRUCTURE 68Ni; calculated Potential energy surfaces in (Q0, Q2) plane for the ground state and first 2+ state. Large-scale Monte Carlo shell model calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.034310
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2015IS02      Acta Phys.Pol. B46, 651 (2015)

L.W.Iskra, R.Broda, R.V.F.Janssens, J.Wrzesinski, C.J.Chiara, M.P.Carpenter, B.Fornal, N.Hoteling, F.G.Kondev, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, I.Stefanescu, W.B.Walters, S.Zhu

E2 Transition Probabilities for Decays of Isomers Observed in Neutron-rich Odd Sn Isotopes

NUCLEAR REACTIONS 208Pb, 238U(48Ca, X), 238U(64Ni, X)116Sn/118Sn/120Sn/122Sn/124Sn/126Sn/128Sn/130Sn, E=6.7-6.9 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced high-spin states energy levels, T1/2, B(E2).

doi: 10.5506/APhysPolB.46.651
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2015LI33      Phys.Rev. C 92, 024319 (2015); Erratum Phys.Rev. C 94, 069904 (2016)

S.N.Liddick, W.B.Walters, C.J.Chiara, R.V.F.Janssens, B.Abromeit, A.Ayres, A.Bey, C.R.Bingham, M.P.Carpenter, L.Cartegni, J.Chen, H.L.Crawford, I.G.Darby, R.Grzywacz, J.Harker, C.R.Hoffman, S.Ilyushkin, F.G.Kondev, N.Larson, M.Madurga, D.Miller, S.Padgett, S.V.Paulauskas, M.M.Rajabali, K.Rykaczewski, D.Seweryniak, S.Suchyta, S.Zhu

Analogous intruder behavior near Ni, Sn, and Pb isotopes

RADIOACTIVITY 69Fe, 69Co, 69Ni(β-)[from 9Be(78Kr, X), E=140 MeV/nucleon]; measured Eγ, Iγ, (ion)γ- and βγ- correlated events, half-lives of ground states of 69Co, 69Fe, and half-life of an isomer in 69Co, absolute intensities of γ rays from the decay of directly produced 69Co and that from the decay of 69Fe using BCS system and SEGA array at NSCL-MSU facility. 69Cu, 69Co; deduced levels in 69Cu, and isomer in 69Co, J, π, intruder configuration; identified and discussed proton particle-hole intruder states originating from excitations across Z=28. 68Fe, 68Co(β-); observed γ.

NUCLEAR REACTIONS 208Pb(70Zn, X)71Cu, E=440 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array at ATLAS-ANL facility. 71Cu; deduced high-spin levels, J, π, band; discussed systematics of level structure and proton particle-hole intruder states in 67,69,71Cu.

doi: 10.1103/PhysRevC.92.024319
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2015PR10      Phys.Rev. C 92, 061302 (2015)

C.J.Prokop, B.P.Crider, S.N.Liddick, A.D.Ayangeakaa, M.P.Carpenter, J.J.Carroll, J.Chen, C.J.Chiara, H.M.David, A.C.Dombos, S.Go, J.Harker, R.V.F.Janssens, N.Larson, T.Lauritsen, R.Lewis, S.J.Quinn, F.Recchia, D.Seweryniak, A.Spyrou, S.Suchyta, W.B.Walters, S.Zhu

New low-energy 0+ state and shape coexistence in 70Ni

RADIOACTIVITY 70,70mCo(β-)[from 9Be(76Ge, X), E=130 MeV/nucleon using A1900 fragment separator at NSCL-MSU]; measured Eγ, Iγ, βγγ-, γγ-coin, level half-life by βγ(t) using SeGA array and silicon PIN detectors. 70Ni; deduced levels, J, π, energy and half-life of excited (0+) state, configuration. Comparison with Monte Carlo shell-model calculations with A3DA interaction. 68Co, 69Ni, 70Zn; observed γ rays from decay of contaminants.

doi: 10.1103/PhysRevC.92.061302
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2014IS04      Phys.Rev. C 89, 044324 (2014)

L.W.Iskra, R.Broda, R.V.F.Janssens, J.Wrzesinski, B.Szpak, C.J.Chiara, M.P.Carpenter, B.Fornal, N.Hoteling, F.G.Kondev, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, I.Stefanescu, W.B.Walters, S.Zhu

Higher-seniority excitations in even neutron-rich Sn isotopes

NUCLEAR REACTIONS 208Pb, 238U(48Ca, X), E=330 MeV; 238U(64Ni, X), E=430 MeV; measured yields of fusion fission Te and complementary Sm reaction products, distribution of number of evaporated neutrons, Eγ, Iγ, γγ-coin, delayed γγ-coin, isomer half-lives using Gammasphere array at ATLAS-ANL facility. Identification of isotopes by prompt and delayed cross coincidences with γ rays from complementary A=146-156 Sm isotopes. 118,120,122,124,126,128Sn; deduced high-spin levels, J, π, multipolarity, high-seniority states, isomers, B(E1), B(E2), B(E3). Comparison with shell model calculations with jj55pn interactions for 122,124,126,128,130Sn nuclides. Systematics of yrast levels and B(Eλ) for A=116-132 even-even Sn isotopes.

doi: 10.1103/PhysRevC.89.044324
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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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2014MU03      Phys.Rev. C 89, 044309 (2014)

S.Muto, N.J.Stone, C.R.Bingham, J.R.Stone, P.M.Walker, G.Audi, C.Gaulard, U.Koster, J.Nikolov, K.Nishimura, T.Ohtsubo, Z.Podolyak, L.Risegari, G.S.Simpson, M.Veskovic, W.B.Walters

Magnetic properties of 177Hf and 180Hf in the strong-coupling deformed model

NUCLEAR REACTIONS Ta, W(p, X), E=1.4 GeV; measured Eγ, Iγ, γ(θ, temp), resonance, magnetic dipole moment of 37/2- isomer in 177Hf and 8- isomer in 180Hf using NICOLE on-line low-temperature nuclear orientation system and NMR at ISOLDE-CERN facility. 177,180Hf; deduced high-spin levels, multipolarity, mixing ratio, (gK-gR)/Q0. Comparison with previous experimental results.

NUCLEAR MOMENTS 177,180Hf; measured magnetic moments of high-spin K-isomers by on-line low-temperature nuclear orientation combined with NMR using NICOLE system at ISOLDE-CERN facility. Discussed dependence of gR parameter upon the quasiproton and quasineutron structure of high-K isomeric states in this mass region.

doi: 10.1103/PhysRevC.89.044309
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2014SU07      Phys.Rev. C 89, 034317 (2014)

S.Suchyta, S.N.Liddick, C.J.Chiara, W.B.Walters, M.P.Carpenter, H.L.Crawford, G.F.Grinyer, G.Gurdal, A.Klose, E.A.McCutchan, J.Pereira, S.Zhu

β decay of 61, 63V and low-energy level schemes of 61, 63Cr

RADIOACTIVITY 61,63V(β-), (β-n)[from 9Be(76Ge, X), E=130 MeV/nucleon]; measured Eγ, Iγ, γγ-, (fragment)γ-coin, I(β-), half-lives of 61,63V ground states using A1900 fragment separator, Beta Counting System (BCS) and Segmented Ge Array (SeGA) at NSCL-MSU facility. 61,63Cr; deduced levels, J, π, %β-n, internal-conversion coefficient, multipolarity, configurations. Comparison with shell-model calculations.

NUCLEAR STRUCTURE 55,57,59,61Cr; calculated levels, J, π, configuration amplitudes using shell-model with GXPF1A and KB3G interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.034317
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2014SU11      Phys.Rev. C 89, 067303 (2014)

S.Suchyta, S.N.Liddick, C.J.Chiara, W.B.Walters, M.P.Carpenter, H.L.Crawford, G.F.Grinyer, G.Gurdal, A.Klose, E.A.McCutchan, J.Pereira, S.Zhu

β and isomeric decay of 64V

RADIOACTIVITY 64V(β-)[from 9Be(76Ge, X), E=130 MeV/nucleon]; measured Eγ, βγ-, (64V)γ-coin, half-life of 64V g.s. using A1900 fragment separator and SeGA array at NSCL-MSU facility. 64Cr; deduced energy of first 2+ level. Systematics of first 2+ and 4+ states in A=54-64 even-even Cr nuclei.

NUCLEAR REACTIONS 9Be(76Ge, X), E=130 MeV/nucleon; measured yields of reaction products, delayed Eγ. 64V; deduced isomer and its half-life.

doi: 10.1103/PhysRevC.89.067303
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2013BA57      Phys.Rev. C 88, 051301 (2013)

V.M.Bader, A.Gade, D.Weisshaar, B.A.Brown, T.Baugher, D.Bazin, J.S.Berryman, A.Ekstrom, M.Hjorth-Jensen, S.R.Stroberg, W.B.Walters, K.Wimmer, R.Winkler

Quadrupole collectivity in neutron-deficient Sn nuclei: 104Sn and the role of proton excitations

NUCLEAR REACTIONS 197Au(104Sn, 104Sn'), (102Cd, 102Cd'), [102Cd, 104Sn secondary beams from 9Be(124Xe, X), E=140 MeV/nucleon primary reaction], E=67 MeV/nucleon for 104Sn and 64 MeV/nucleon for 102Cd; measured scattered particle spectra, Eγ, Iγ, (particle)γ-coin using A1900 fragment separator, Si p-i-n detector and TOF for particles and CAESAR array of scintillation detectors for γ rays at NSCL-MSU facility. 104Sn; deduced level, B(E2) for first 2+ state relative to that for 102Cd. Comparison with previous experimental results, and with large-scale shell model calculations. Enhanced quadrupole collectivity. Systematics of B(E2) values for A=104 to 130 even-A Sn nuclei.

doi: 10.1103/PhysRevC.88.051301
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2013CH13      Acta Phys.Pol. B44, 371 (2013)

C.J.Chiara, W.B.Walters, R.V.F.Janssens, R.Broda, M.Albers, M.Alcorta, P.F.Bertone, M.P.Carpenter, C.R.Hoffman, T.Lauritsen, A.M.Rogers, D.Seweryniak, S.Zhu, F.G.Kondev, B.Fornal, W.Krolas, J.Wrzesinski, N.Larson, S.N.Liddick, C.Prokop, S.Suchyta, H.M.David, D.T.Doherty

Search for Intruder States in 68Ni and 67Co

NUCLEAR REACTIONS 238U, 208Pb, 197Au(70Zn, X)68Ni/67Co, E=440 MeV; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced level scheme, J, π, lack of evidence for intruder states.

doi: 10.5506/APhysPolB.44.371
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2013IS04      Acta Phys.Pol. B44, 395 (2013)

L.W.Iskra, R.Broda, J.Wrzesinski, M.P.Carpenter, C.J.Chiara, B.Fornal, N.Hoteling, R.V.F.Janssens, F.G.Kondev, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, I.Stefanescu, W.B.Walters, S.Zhu

High-seniority Excitations in Even Neutron-rich Sn Isotopes Populated in Fusion-Fission Reactions

NUCLEAR REACTIONS 208Pb, 238U(48Ca, X), E=330 MeV; 238U(64Ni, X), E=430 MeV; measured fusion fission reaction products, Eγ, Iγ, γ-γ-coin. 118,119,120,121,122,123,124,125,126,128Sn; deduced level energies, J, π, high-spin states, long-lived isomers.

doi: 10.5506/APhysPolB.44.395
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2013RA17      Phys.Rev. C 88, 014307 (2013)

D.Radulov, C.J.Chiara, I.G.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, U.Koster, B.A.Marsh, D.Pauwels, L.Popescu, M.D.Seliverstov, A.M.Sjodin, P.Van den Bergh, P.Van Duppen, M.Venhart, W.B.Walters, K.Wimmer

β decay of 61Mn to levels in 61Fe

RADIOACTIVITY 61Mn(β-)[from 238U(p, F), E=1.4 GeV]; measured Eγ, Iγ, γγ-, βγ-coin, βγ(t), T1/2 of 61Mn g.s., upper limit of P(n) to first 2+ state in 60Fe at ISOLDE, CERN facility. Laser ionization and mass separation of 61Mn beam. 61Fe; deduced levels, J, π, β feedings, logft. Comparison with shell-model calculations. Systematics of ground and first excited states in 24,26,28,30,32,34,36Mn.

NUCLEAR STRUCTURE 59,61Fe; calculated levels J, π using shell model with GXPF1A and pf(g0) interactions. Comparison with experimental data.

doi: 10.1103/PhysRevC.88.014307
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2013RE18      Phys.Rev. C 88, 041302 (2013)

F.Recchia, C.J.Chiara, R.V.F.Janssens, D.Weisshaar, A.Gade, W.B.Walters, M.Albers, M.Alcorta, V.M.Bader, T.Baugher, D.Bazin, J.S.Berryman, P.F.Bertone, B.A.Brown, C.M.Campbell, M.P.Carpenter, J.Chen, H.L.Crawford, H.M.David, D.T.Doherty, C.R.Hoffman, F.G.Kondev, A.Korichi, C.Langer, N.Larson, T.Lauritsen, S.N.Liddick, E.Lunderberg, A.O.Macchiavelli, S.Noji, C.Prokop, A.M.Rogers, D.Seweryniak, S.R.Stroberg, S.Suchyta, S.Williams, K.Wimmer, S.Zhu

Configuration mixing and relative transition rates between low-spin states in 68Ni

NUCLEAR REACTIONS 208Pb(70Zn, X)68Ni, E=440 MeV; measured Eγ, Iγ, (68Ni)γ-, γγ-coin, prompt and delayed γ rays, level half-life using Gammasphere array at ATLAS-ANL facility. 9Be(70Ni, X)68Ni, E=75 MeV/nucleon, [secondary 70Ni beam from 9Be(82Se, X), E=140 MeV/nucleon primary reaction]; measured Eγ, Iγ, γγ-coin, prompt and delayed γ rays, level half-life using S800 spectrograph, GRETINA and CsI(Na) arrays at NSCL-MSU facility. 68Ni; deduced levels, J, π, B(E2) ratios. Comparison with shell-model calculations using jj44pna, jj44b, JUN45, and LNPS effective interactions. Discussed configuration mixing.

doi: 10.1103/PhysRevC.88.041302
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2013TO05      Phys.Rev. C 87, 041304 (2013)

Y.Toh, C.J.Chiara, E.A.McCutchan, W.B.Walters, R.V.F.Janssens, M.P.Carpenter, S.Zhu, R.Broda, B.Fornal, B.P.Kay, F.G.Kondev, W.Krolas, T.Lauritsen, C.J.Lister, T.Pawlat, D.Seweryniak, I.Stefanescu, N.J.Stone, J.Wrzesinski, K.Higashiyama, N.Yoshinaga

Evidence for rigid triaxial deformation at low energy in 76Ge

NUCLEAR REACTIONS 238U(76Ge, 76Ge'), E=530 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ) using Gammasphere array at ATLAS facility in ANL. 76Ge; deduced high-spin levels, bands, multipolarity, mixing ratios, J, π, B(E2), staggering. Comparison with collective- and shell-model calculations. Evidence of rigid triaxial deformation in the low-lying states of 76Ge. Systematics of staggering parameter for γ bands in 74,76,78Se, 76Ge, 76,78,80Kr nuclei.

doi: 10.1103/PhysRevC.87.041304
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2012BR15      Phys.Rev. C 86, 064312 (2012)

R.Broda, T.Pawlat, W.Krolas, R.V.F.Janssens, S.Zhu, W.B.Walters, B.Fornal, C.J.Chiara, M.P.Carpenter, N.Hoteling, L.W.Iskra, F.G.Kondev, T.Lauritsen, D.Seweryniak, I.Stefanescu, X.Wang, J.Wrzesinski

Spectroscopic study of the 64, 66, 68Ni isotopes populated in 64Ni+238U collisions

NUCLEAR REACTIONS 238U(64Ni, X), E=430 MeV; measured Eγ, Iγ, γγ(θ), γγ-coin, delayed γγ-coin using Gammasphere array at ANL facility. 64,66,68Ni; deduced levels, J, π. Comparison with shell-model calculations. Quasielastic and deep-inelastic reactions.

NUCLEAR STRUCTURE 64,66,68Ni; calculated levels, J, π, configuration mixtures using large-scale shell-model with jj44b and jun45 interactions.

doi: 10.1103/PhysRevC.86.064312
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2012CH09      Phys.Rev. C 85, 024309 (2012)

C.J.Chiara, I.Stefanescu, W.B.Walters, S.Zhu, R.V.F.Janssens, M.P.Carpenter, R.Broda, B.Fornal, A.A.Hecht, N.Hoteling, E.G.Jackson, B.P.Kay, W.Krolas, T.Lauritsen, E.A.McCutchan, T.Pawlat, D.Seweryniak, X.Wang, A.Wohr, J.Wrzesinski

Core-coupled protons, F7/2 intruder states, and competing G9/2 proton and neutron structures in 65, 67Cu

NUCLEAR REACTIONS 238U(64Ni, X)65Cu/67Cu, E=430 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), γγ(θ) using Gammasphere array and ATLAS facility at ANL. 65,67Cu; deduced levels, J, π, multipolarity, mixing ratios, configurations. Systematics of 7/2- and positive-parity states in A=57-71 Cu isotopes, and 2+ and 5- states in A=56-70 Ni isotopes. Systematics of ground-state bands in 60,66,68,70Zn and compared with those of f7/2- proton bands in 59,65,67,69Cu. Comparison with shell model calculations using JUN45 and jj44b interactions.

doi: 10.1103/PhysRevC.85.024309
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2012CH39      Phys.Rev. C 86, 041304 (2012)

C.J.Chiara, R.Broda, W.B.Walters, R.V.F.Janssens, M.Albers, M.Alcorta, P.F.Bertone, M.P.Carpenter, C.R.Hoffman, T.Lauritsen, A.M.Rogers, D.Seweryniak, S.Zhu, F.G.Kondev, B.Fornal, W.Krolas, J.Wrzesinski, N.Larson, S.N.Liddick, C.Prokop, S.Suchyta, H.M.David, D.T.Doherty

Low-spin states and the non-observation of a proposed 2202-keV, o+ isomer in 68Ni

NUCLEAR REACTIONS 197Au, 208Pb, 238U(70Zn, X), E=430, 440 MeV; measured Eγ, Iγ, (particle)γ-, γγ-coin, γγ(θ), prompt and delayed γ using Gammasphere array at ATLAS facility in ANL. 68Ni; deduced levels, J, π, T1/2, multipolarity and mixing ratio. Non-observation of a previously reported 0+ isomer in 68Ni.

doi: 10.1103/PhysRevC.86.041304
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2012CI05      Phys.Rev. C 86, 054322 (2012)

N.Cieplicka, K.H.Maier, B.Fornal, B.Szpak, R.V.F.Janssens, M.Alcorta, R.Broda, M.P.Carpenter, C.J.Chiara, C.R.Hoffman, B.P.Kay, F.G.Kondev, W.Krolas, T.Lauritsen, C.J.Lister, E.A.McCutchan, T.Pawlat, A.M.Rogers, D.Seweryniak, N.Sharp, W.B.Walters, J.Wrzesinski, S.Zhu

Yrast structure of 206Bi: Isomeric states and one-proton-particle, three-neutron-hole excitations

NUCLEAR REACTIONS 208Pb(76Ge, X), E=450 MeV; measured Eγ, Iγ, γ(θ), γγ-coin. 206Bi; deduced levels, J, π, T1/2, multipolarity, mixing ratio, configurations. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.86.054322
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2012OH01      Phys.Rev.Lett. 109, 032504 (2012)

T.Ohtsubo, N.J.Stone, J.R.Stone, I.S.Towner, C.R.Bingham, C.Gaulard, U.Koster, S.Muto, J.Nikolov, K.Nishimura, G.S.Simpson, G.Soti, M.Veskovic, W.B.Walters, F.Wauters

Magnetic Dipole Moment of the Doubly-Closed-Shell Plus One Proton Nucleus 49Sc

NUCLEAR MOMENTS 49Sc; measured hyperfine field, β asymmetry; deduced magnetic dipole moment. Comparison with available data.

NUCLEAR STRUCTURE 41,49Sc; calculated magnetic dipole moment.

doi: 10.1103/PhysRevLett.109.032504
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2012PA39      Phys.Rev. C 86, 064318 (2012)

D.Pauwels, D.Radulov, W.B.Walters, I.G.Darby, H.De Witte, J.Diriken, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, M.Huyse, U.Koster, B.A.Marsh, L.Popescu, M.D.Seliverstov, A.M.Sjodin, P.Van den Bergh, J.Van de Walle, P.Van Duppen, M.Venhart, K.Wimmer

Gamow-Teller decay population of 64Ni levels in the decay of 1+ 64Co

RADIOACTIVITY 64Co(β-)[from U(p, F), E=1.4 GeV]; measured Eγ, Iγ, γγ-coin, Eβ using RILIS laser system and MINIBALL γ-detector clusters at CERN-ISOLDE facility. 64Ni; deduced levels, J, π, Iβ, logft, configurations, possible proton-intruder levels. 64Mn(β-n); measured Eγ, Iγ; deduced beta-delayed neutron probability Pn. Comparison with previous experimental studies. 63,64Fe, 64Ga, 128mIn(β-); observed Eγ.

doi: 10.1103/PhysRevC.86.064318
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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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2012ZH08      Phys.Rev. C 85, 034336 (2012)

S.Zhu, R.V.F.Janssens, M.P.Carpenter, C.J.Chiara, R.Broda, B.Fornal, N.Hoteling, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, I.Stefanescu, J.R.Stone, W.B.Walters, X.Wang, J.Wrzesinski

Nature of yrast excitations near N=40: Level structure of 67Ni

NUCLEAR REACTIONS 238U(64Ni, X), E=430 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(t) using Gammasphere array at ATLAS facility. 67Ni; deduced high-spin levels, J, π, half-life, multipolarity, mixing ratio, configurations. Comparison with shell-model calculations. 64Ni; measured Eγ; deduced levels.

doi: 10.1103/PhysRevC.85.034336
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2011AR18      Phys.Rev. C 84, 061307 (2011)

O.Arndt, K.-L.Kratz, W.B.Walters, K.Farouqi, U.Koster, V.Fedosseev, S.Hennrich, C.J.Jost, A.Wohr, A.A.Hecht, B.Pfeiffer, J.Shergur, N.Hoteling

Decay of the r-process nuclides 137, 138, 139Sb, and the A=130 solar r-process abundance peak

RADIOACTIVITY 137,138,139Sb, 136,137Sn(β-), (β-n); measured E(n), I(n), half-lives, β-delayed neutron emission probability Pn using RILIS source and high-resolution mass separator at ISOLDE-CERN facility. 134,135,136,137,138,139,140Sb(β-), (β-n); calculated half-lives and β-delayed neutron probabilities for spherical and non-spherical shapes. Calculated r-process residual isotopic abundance plot using new data.

doi: 10.1103/PhysRevC.84.061307
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2011CH42      Phys.Rev. C 84, 037304 (2011)

C.J.Chiara, W.B.Walters, I.Stefanescu, M.Alcorta, M.P.Carpenter, B.Fornal, G.Gurdal, C.R.Hoffman, R.V.F.Janssens, B.P.Kay, F.G.Kondev, W.Krolas, T.Lauritsen, C.J.Lister, E.A.McCutchan, T.Pawlat, A.M.Rogers, D.Seweryniak, N.Sharp, J.Wrzesinski, S.Zhu

Seniority, collectivity, and B(E2) enhancement in 72Ni

NUCLEAR REACTIONS 238U(76Ge, X), E=530 MeV; 198Pt, 208Pb(76Ge, X), E=450 MeV; measured Eγ, Iγ, γγ-coin, isomer half-life using Gammasphere array. 72Ni; deduced levels, J, π, B(E2). Comparison with shell-model calculations, and level systematics of 70,76Ni.

doi: 10.1103/PhysRevC.84.037304
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2011LI50      Phys.Rev. C 84, 061305 (2011)

S.N.Liddick, S.Suchyta, B.Abromeit, A.Ayres, A.Bey, C.R.Bingham, M.Bolla, M.P.Carpenter, L.Cartegni, C.J.Chiara, H.L.Crawford, I.G.Darby, R.Grzywacz, G.Gurdal, S.Ilyushkin, N.Larson, M.Madurga, E.A.McCutchan, D.Miller, S.Padgett, S.V.Paulauskas, J.Pereira, M.M.Rajabali, K.Rykaczewski, S.Vinnikova, W.B.Walters, S.Zhu

Shape coexistence along N=40

RADIOACTIVITY 64,66Mn(IT)[from 9Be(76Ge, X), E=140 MeV/nucleon]; 64,66Cr(β-)[from 9Be(86Kr, X), E=130 MeV/nucleon]; measured Eγ, Iγ, (fragment)βγ-, γγ-coin, γ(t), half-lives. 64,66Mn; deduced levels, J, π, beta feedings, log ft, configurations.

doi: 10.1103/PhysRevC.84.061305
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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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2010CH51      Phys.Rev. C 82, 054313 (2010)

C.J.Chiara, I.Stefanescu, N.Hoteling, W.B.Walters, R.V.F.Janssens, R.Broda, M.P.Carpenter, B.Fornal, A.A.Hecht, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, X.Wang, A.Wohr, J.Wrzesinski, S.Zhu

Influence of the νg9/2 orbital on level structures of neutron-rich 61, 62Mn36, 37

NUCLEAR REACTIONS 238U(64Ni, X)61Mn/62Mn, E=430 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array. 61,62Mn; deduced levels, J, π. Comparison with level structures of 53,55,57,59,58,60,64Mn.

doi: 10.1103/PhysRevC.82.054313
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2010CR02      Phys.Rev. C 82, 014311 (2010)

H.L.Crawford, R.V.F.Janssens, P.F.Mantica, J.S.Berryman, R.Broda, M.P.Carpenter, N.Cieplicka, B.Fornal, G.F.Grinyer, N.Hoteling, B.P.Kay, T.Lauritsen, K.Minamisono, I.Stefanescu, J.B.Stoker, W.B.Walters, S.Zhu

β decay and isomeric properties of neutron-rich Ca and Sc isotopes

RADIOACTIVITY 53,54,55,56,57Sc, 53,54Ca(β-); 54,56Sc(IT)[from Be(76Ge, X), E=130 MeV/nucleon]; measured Eγ, Iγ, (fragment)β-, γγ-, βγ-, (fragment)βγ-coin, half-lives. 53,54,55,56,57Ti, 53,54,56Sc; deduced levels, J, π, logft, configurations. Comparison with GXPF1 shell-model calculations. 54Ti(β-); measured half-life. 54,55,56Sc(β-n); deduced %β--n.

NUCLEAR STRUCTURE 52,54,56Sc; calculated levels, J, π using GXPF1 shell-model.

NUCLEAR REACTIONS Be(76Ge, X)52Ca/53Ca/54Ca/53Sc/54Sc/55Sc/56Sc/55Ti/56Ti/57Ti/58Ti/57V/58V/59V/60V/, E=130 MeV/nucleon; measured yields.

doi: 10.1103/PhysRevC.82.014311
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2010DI14      Phys.Rev. C 82, 064309 (2010)

J.Diriken, I.Stefanescu, D.Balabanski, N.Blasi, A.Blazhev, N.Bree, J.Cederkall, T.E.Cocolios, T.Davinson, J.Eberth, A.Ekstrom, D.V.Fedorov, V.N.Fedosseev, L.M.Fraile, S.Franchoo, G.Georgiev, K.Gladnishki, M.Huyse, O.V.Ivanov, V.S.Ivanov, J.Iwanicki, J.Jolie, T.Konstantinopoulos, Th.Kroll, R.Krucken, U.Koster, A.Lagoyannis, G.Lo Bianco, P.Maierbeck, B.A.Marsh, P.Napiorkowski, N.Patronis, D.Pauwels, P.Reiter, M.Seliverstov, G.Sletten, J.Van de Walle, P.Van Duppen, D.Voulot, W.B.Walters, N.Warr, F.Wenander, K.Wrzosek

Coulomb excitation of 73Ga

NUCLEAR REACTIONS 104Pd(71Ga, 71Ga'), 120Sn(73Ga, 73Ga'), E=2.95 MeV/nucleon, [secondary 71,73Ga beams from U(p, X), E=1 GeV]; measured Eγ, Iγ, (particle)γ-, γγ-coin at REX-ISOLDE. 71Ga, 73Ga; deduced levels, J, π, B(E2). Comparison with level systematics of 63,65,67,69,71,73,75,77Ga. Collectivity due to g9/2 neutron orbital.

RADIOACTIVITY 73Zn(β-)[from U(p, X), E=1 GeV]; measured Eγ.

doi: 10.1103/PhysRevC.82.064309
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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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2010HO13      Phys.Rev. C 82, 044305 (2010)

N.Hoteling, C.J.Chiara, R.Broda, W.B.Walters, R.V.F.Janssens, M.Hjorth-Jensen, M.P.Carpenter, B.Fornal, A.A.Hecht, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, X.Wang, A.Wohr, J.Wrzesinski, S.Zhu

Structure of 60, 62Fe and the onset of νg9/2 occupancy

NUCLEAR REACTIONS 238U(64Ni, X), E=430 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ), prompt and delayed γ spectra using Gammasphere array. 60,62Fe; deduced levels, J, π, multipolarity, yrast levels. Comparison with shell model calculations. Level systematics of 54,56,58,60,62,64Fe nuclei.

RADIOACTIVITY 60,62Mn(β-)[from 238U(64Ni, X), E=430 MEV]; measured Eγ, Iγ, γγ-coin, γγ(θ) using Gammasphere array. 60,62Fe; deduced levels, J, π, multipolarity.

doi: 10.1103/PhysRevC.82.044305
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2009AR04      Acta Phys.Pol. B40, 437 (2009)

O.Arndt, S.Hennrich, N.Hoteling, C.J.Jost, B.E.Tomlin, J.Shergur, K.-L.Kratz, P.F.Mantica, B.A.Brown, R.V.F.Janssens, W.B.Walters, B.Pfeiffer, A.Wohr, S.Zhu, R.Broda, M.P.Carpenter, B.Fornal, A.A.Hecht, W.Krolas, T.Lauritsen, T.Pawlat, J.Pereira, D.Seweryniak, I.Stefanescu, J.R.Stone, J.Wrzesinski

Structure of Neutron-Rich Odd-Mass 127, 129, 131In Populated in the Decay of 127, 129, 131Cd

RADIOACTIVITY 127,129,131Cd(β-); measured Iγ, Eγ; deduced Jπ, level scheme. Comparison with calculations.


2009CR02      Phys.Rev. C 79, 054320 (2009)

H.L.Crawford, P.F.Mantica, J.S.Berryman, R.Broda, B.Fornal, C.R.Hoffman, N.Hoteling, R.V.F.Janssens, S.M.Lenzi, J.Pereira, J.B.Stoker, S.L.Tabor, W.B.Walters, X.Wang, S.Zhu

Low-energy structure of 61Mn populated following β decay of 61Cr

RADIOACTIVITY 61Cr(β-)[from Be(76Ge, X), E=130 MeV/nucleon]; measured Eγ, Iγ, γγ-, βγ-coin, half-life. 61Mn; deduced levels, J, π. 54,56,58,60,62Cr, 56,58,60,62,64,66,68Fe, 58,60,62,64,66,68,70Ni, 57,59,61,63Mn; level systematics and shell-model calculations.

NUCLEAR REACTIONS 9Be(76Ge, X)57Sc/58Ti/59Ti/59V/60V/60Cr/61Cr/62Cr/62Mn/63Mn, E=130 MeV/nucleon; measured yields.

doi: 10.1103/PhysRevC.79.054320
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2009CR03      Acta Phys.Pol. B40, 481 (2009)

H.L.Crawford, R.V.F.Janssens, P.F.Mantica, J.S.Berryman, R.Broda, M.P.Carpenter, B.Fornal, G.F.Grinyer, N.Hoteling, B.Kay, T.Lauritsen, K.Minamisono, I.Stefanescu, J.B.Stoker, W.B.Walters, S.Zhu

β Decay Studies of Neutron-Rich Nuclei Near 52Ca

RADIOACTIVITY 54Sc, 50K, 53Ca(β-);measured Eγ, Iγ;deduced level scheme, Jπ, isomeric transitions.

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2009PA16      Phys.Rev. C 79, 044309 (2009)

D.Pauwels, O.Ivanov, N.Bree, J.Buscher, T.E.Cocolios, M.Huyse, Yu.Kudryavtsev, R.Raabe, M.Sawicka, J.Van de Walle, P.Van Duppen, A.Korgul, I.Stefanescu, A.A.Hecht, N.Hoteling, A.Wohr, W.B.Walters, R.Broda, B.Fornal, W.Krolas, T.Pawlat, J.Wrzesinski, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, D.Seweryniak, S.Zhu, J.R.Stone, X.Wang

Structure of 65, 67Co studied through the β decay of 65, 67Fe and a deep-inelastic reaction

RADIOACTIVITY 65,65mFe, 65Co, 67Fe(β-)[from 238U(p, F), E=30 MeV]; measured Eγ, Iγ, γγ-, βγ-coin, half-lives. 65Co, 65Ni, 67Co; deduced levels, J, π, configurations. 61,63,65Co; level systematics. Interpretation in terms of core coupled states with proton intruder orbitals.

NUCLEAR REACTIONS 238U(64Ni, X), E=430 MeV; measured Eγ, Iγ, γγ-coin. 65Co; deduced levels, J, π, configurations.

doi: 10.1103/PhysRevC.79.044309
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2009PA20      Acta Phys.Pol. B40, 629 (2009)

T.Pawlat, R.Broda, B.Fornal, W.Krolas, J.Wrzesinski, R.V.F.Janssens, S.Zhu, M.P.Carpenter, W.B.Walters, N.Hoteling

Experimental Study of Neutron-Rich Nuclei 89Rb and 91Rb

NUCLEAR REACTIONS 208Pb, 238U(48Ca, X), 238U(64Ni, X), E=305, 330, 430 MeV;89,91Rb; measured Eγ, Iγ, γγ-coin; deduced J, π, level scheme, T1/2.

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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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2009SE06      Acta Phys.Pol. B40, 621 (2009)

D.Seweryniak, M.P.Carpenter, S.Gros, A.A.Hecht, N.Hoteling, R.V.F.Janssens, T.L.Khoo, T.Lauritsen, C.J.Lister, G.Lotay, D.Peterson, A.P.Robinson, W.B.Walters, X.Wang, P.J.Woods, S.Zhu

New Results Near 100Sn: Observation of Single-Neutron States in 101Sn

NUCLEAR REACTIONS 58Ni(46Ti, 3n), E=192 MeV; measured Eγ, Iγ, β-delayed Ep, Ip. Comparison with shell model calculations.


2009ST05      Phys.Rev. C 79, 034319 (2009)

I.Stefanescu, W.B.Walters, R.V.F.Janssens, N.Hoteling, R.Broda, M.P.Carpenter, B.Fornal, A.A.Hecht, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, J.R.Stone, X.Wang, A.Wohr, J.Wrzesinski, S.Zhu

Levels above the 19/2- isomer in 71Cu: Persistence of the N=40 neutron shell gap

NUCLEAR REACTIONS 238U(64Ni, X), E=430 MeV; measured Eγ, Iγ, γγ-coin. 71Cu; deduced levels, J, π, configurations. 70Ni, 71Cu, 92Mo; level systematics. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.79.034319
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2009ST07      Phys.Rev. C 79, 044325 (2009)

I.Stefanescu, D.Pauwels, N.Bree, T.E.Cocolios, J.Diriken, S.Franchoo, M.Huyse, O.Ivanov, Y.Kudryavtsev, N.Patronis, J.Van De Walle, P.Van Duppen, W.B.Walters

Evidence for a β-decaying 1/2- isomer in 71Ni

RADIOACTIVITY 71Co, 71Ni(β-) [from 238U(p, X), E=30 MeV]; measured Eγ, Iγ, β, γγ-, βγ-coin with laser on Co resonance, half-lives. 71Ni, 71Cu; deduced levels, J, π, configurations. 69Ni, 69Cu; systematics.

doi: 10.1103/PhysRevC.79.044325
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2009ST12      Phys.Rev. C 79, 064302 (2009)

I.Stefanescu, W.B.Walters, R.V.F.Janssens, S.Zhu, R.Broda, M.P.Carpenter, C.J.Chiara, B.Fornal, B.P.Kay, F.G.Kondev, W.Krolas, T.Lauritsen, C.J.Lister, E.A.McCutchan, T.Pawlat, D.Seweryniak, J.R.Stone, N.J.Stone, J.Wrzesinski

Identification of the g9/2-proton bands in the neutron-rich 71, 73, 75, 77Ga nuclei

NUCLEAR REACTIONS 238U(76Ge, X), E=530 MeV; measured Eγ, Iγ, γγ-coin. 71,73,75,77Ga; deduced levels, J, π. Discussed level systematics of A=65-77, odd-A Ga and Cu nuclides.

doi: 10.1103/PhysRevC.79.064302
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2009ST28      Eur.Phys.J. A 42, 407 (2009)

I.Stefanescu, W.B.Walters, P.F.Mantica, B.A.Brown, A.D.Davies, A.Estrade, P.T.Hosmer, N.Hoteling, S.N.Liddick, W.D.M.Rae, T.J.Mertzimekis, F.Montes, A.C.Morton, W.F.Mueller, M.Ouellette, E.Pellegrini, P.Santi, D.Seweryniak, H.Schatz, J.Shergur, A.Stolz, J.R.Stone, B.E.Tomlin

Spectroscopy of exotic 121, 123, 125Ag produced in fragmentation reactions

NUCLEAR REACTIONS 9Be(136Xe, X)121Pd/123Ag/125Ag, E=120 MeV/nucleon; measured Eγ, Iγ, γγ-, (fragment)γ-coin. 121,123,125Ag; deduced levels, J, π, T1/2. Comparison with shell model and systematics.

RADIOACTIVITY 121Pd(β-) [from 9Be(136Xe, X), E=120 MeV/nucleon]; measured Eγ, Iγ, γγ-, (fragment)γ-coin. 121Ag; deduced levels, J, π. Comparison with shell model and systematics.

doi: 10.1140/epja/i2008-10754-7
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2008HO05      Phys.Rev. C 77, 044314 (2008)

N.Hoteling, W.B.Walters, R.V.F.Janssens, R.Broda, M.P.Carpenter, B.Fornal, A.A.Hecht, M.Hjorth-Jensen, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, J.R.Stone, X.Wang, A.Wohr, J.Wrzesinski, S.Zhu

Rotation-aligned coupling in 61Fe

NUCLEAR REACTIONS 238U(64Ni, X), E=430 MeV; measured Eγ, Iγ, γγ-coin. 61Fe; deduced levels, J, π. 59Fe; measured Eγ, Iγ. 56,57,58,59,60Fe; systematics. Comparisons with shell model and particle-triaxial rotor model.

doi: 10.1103/PhysRevC.77.044314
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2008MA01      Phys.Rev. C 77, 014313 (2008)

P.F.Mantica, R.Broda, H.L.Crawford, A.Damaske, B.Fornal, A.A.Hecht, C.Hoffman, M.Horoi, N.Hoteling, R.V.F.Janssens, J.Pereira, J.S.Pinter, J.B.Stoker, S.L.Tabor, T.Sumikama, W.B.Walters, X.Wang, S.Zhu

β decay of neutron-rich 53-56Ca

RADIOACTIVITY 53,54,55,56Ca(β-) [from 9Be(76Ge, X), E=140 MeV/nucleon; measured Eγ, Iγ, βγ-coin, half-lives. 54Ca; deduced Iβ, logft. 54Sc; levels, J, π, half-lives, B(M1), B(E2), comparison with calculations.

NUCLEAR REACTIONS 9Be(76Ge, X)49Cl/50Ar/51Ar/52K/53K/54K/53Ca/54Ca/55Ca/56Ca/55Sc/56Sc/57Sc/57Ti/58Ti/59Ti/60V, E=140 MeV/nucleon; measured reaction yields.

doi: 10.1103/PhysRevC.77.014313
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2008MA59      Bull.Am.Phys.Soc. 53, 64 ED.02 (2008)

P.F.Mantica, H.L.Crawford, J.Pereira, J.S.Pinter, J.B.Stoker, R.Broda, B.Fornal, R.V.F.Janssens, X.Wang, S.Zhu, N.Hoteling, W.B.Walters, C.R.Hoffman, S.L.Tabor

β decay of 51, 52Ar

RADIOACTIVITY 51,52Ar(β-) [from Be(76Ge, X), E=130 MeV/nucleon]; measured decay products, Eβ, Iβ; deduced T1/2. NSCL beta counting system.


2008PA33      Phys.Rev. C 78, 041307 (2008)

D.Pauwels, O.Ivanov, N.Bree, J.Buscher, T.E.Cocolios, J.Gentens, M.Huyse, A.Korgul, Yu.Kudryavtsev, R.Raabe, M.Sawicka, I.Stefanescu, J.Van de Walle, P.Van den Bergh, P.Van Duppen, W.B.Walters

Shape isomerism at N = 40: Discovery of a proton intruder state in 67Co

RADIOACTIVITY 67Fe(β-) [from 238U(p, F), E=30 MeV]; measured Eγ, Iγ, Eβ, Iβ, γγ-, γβ-coin, half-lives, multipolarities, logft. 67Co; deduced levels, isomers, configurations by correlation techniques. Comparisons with 57,59,61,63,65,67Co, 68Ni and theoretical data.

doi: 10.1103/PhysRevC.78.041307
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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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2008ST01      Phys.Rev. C 77, 014315 (2008)

N.J.Stone, K.van Esbroeck, J.Rikovska Stone, M.Honma, T.Giles, M.Veskovic, G.White, A.Wohr, V.I.Mishin, V.N.Fedoseyev, U.Koster, P.F.Mantica, W.B.Walters

Nuclear dipole moment of 71Cu from online β-NMR measurements

RADIOACTIVITY 71Cu(β-); measured magnetic moment of ground state. Compared with magnetic dipole moments of 57,59,61,63,65,67,69Cu.

doi: 10.1103/PhysRevC.77.014315
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2007HO22      Phys.Rev. C 76, 044324 (2007)

N.Hoteling, W.B.Walters, B.E.Tomlin, P.F.Mantica, J.Pereira, A.Becerril, T.Fleckenstein, A.A.Hecht, G.Lorusso, M.Quinn, J.S.Pinter, J.B.Stoker

Onset of isomers in 125, 126, 127, 128Cd and weakened neutron-neutron interaction strength

NUCLEAR REACTIONS Be(136Xe, X), E=120 MeV/nucleon; measured Eγ, Iγ. 125Cd, 126Cd, 127Cd, 128Cd deduced levels, J, π, isomers, half-lives, band structure; 100,115,117,119,121,122,123,124Cd; level systematics.

doi: 10.1103/PhysRevC.76.044324
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2007MA40      Acta Phys.Pol. B38, 1213 (2007)

H.Mach, L.M.Fraile, O.Arndt, A.Blazhev, N.Boelaert, M.J.G.Borge, R.Boutami, H.Bradley, N.Braun, B.A.Brown, P.A.Butler, A.Covello, Z.Dlouhy, C.Fransen, H.O.U.Fynbo, A.Gargano, Ch.Hinke, P.Hoff, A.Joinet, A.Jokinen, J.Jolie, U.Koster, A.Korgul, K.-L.Kratz, T.Kroll, W.Kurcewicz, J.Nyberg, E.-M.Reillo, E.Ruchowska, W.Schwerdtfeger, G.S.Simpson, M.Stanoiu, O.Tengblad, P.G.Thirolf, W.B.Walters

The Single-Particle and Collective Features in the Nuclei Just Above 132Sn

RADIOACTIVITY 136Sn(β-); measured Eγ, Iγ, γγ-coinc. 135Sb deduced levels, B(E2).


2007SE04      Phys.Rev.Lett. 99, 022504 (2007)

D.Seweryniak, M.P.Carpenter, S.Gros, A.A.Hecht, N.Hoteling, R.V.F.Janssens, T.L.Khoo, T.Lauritsen, C.J.Lister, G.Lotay, D.Peterson, A.P.Robinson, W.B.Walters, X.Wang, P.J.Woods, S.Zhu

Single-Neutron States in 101Sn

NUCLEAR REACTIONS 46Ti(58Ni, X)101Sn, E=192 MeV; measured Eγ, Ep, pγ-coinc. 101Sn deduced levels and relative single particle energies.

doi: 10.1103/PhysRevLett.99.022504
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2007SE06      Phys.Rev.Lett. 99, 082502 (2007)

D.Seweryniak, B.Blank, M.P.Carpenter, C.N.Davids, T.Davinson, S.J.Freeman, N.Hammond, N.Hoteling, R.V.F.Janssens, T.L.Khoo, Z.Liu, G.Mukherjee, A.Robinson, C.Scholey, S.Sinha, J.Shergur, K.Starosta, W.B.Walters, A.Woehr, P.J.Woods

Effect of a Triaxial Nuclear Shape on Proton Tunneling: The Decay and Structure of 145Tm

NUCLEAR REACTIONS 58Ni(92Mo, 4np), E=417 MeV; measured Eγ, Iγ, Ep, pγ-coinc. 145Tm deduced levels, J, π.

doi: 10.1103/PhysRevLett.99.082502
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2007ST19      Nucl.Phys. A787, 455c (2007)

M.A.Stoyer, W.B.Walters, C.Y.Wu, D.Cline, H.Hua, A.B.Hayes, R.Teng, R.M.Clark, P.Fallon, A.Goergen, A.O.Macchiavelli, K.Vetter, P.Mantica, B.Tomlin

Spectroscopy of neutron-rich Pd and Cd isotopes near A=120

NUCLEAR REACTIONS 238U(α, F), E=30 MeV; measured fission fragment yield, Eγ, Iγ, (fragment)γ-coin. 117,118,120Pd, 122,124Cd deduced levels, J, π.

NUCLEAR STRUCTURE 94,96,98,100,102,104,106,108,110,112,114,116,118,120Pd; analyzed levels, J, π; deduced configuration systematics and shell closure effects.

doi: 10.1016/j.nuclphysa.2006.12.068
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2007TO23      Eur.Phys.J. Special Topics 150, 183 (2007)

B.E.Tomlin, P.F.Mantica, W.B.Walters

Seeking the phase transition where Cd, Ag, Pd, Rh, and Ru isotopes become "neutron rich": Isomeric decay in 125, 126, 127Cd, 123, 124, 125Ag, 121Pd, 120Rh, and 117Ru

RADIOACTIVITY 117Ru, 120Rh, 121Pd, 123,124,125Ag, 125,126,127Cd(IT); measured Eγ, Iγ from isomer decays.

doi: 10.1140/epjst/e2007-00298-0
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2007WH01      Phys.Rev. C 76, 057303 (2007)

E.R.White, H.Mach, L.M.Fraile, U.Koster, O.Arndt, A.Blazhev, N.Boelaert, M.J.G.Borge, R.Boutami, H.Bradley, N.Braun, Z.Dlouhy, C.Fransen, H.O.U.Fynbo, Ch.Hinke, P.Hoff, A.Joinet, A.Jokinen, J.Jolie, A.Korgul, K.-L.Kratz, T.Kroll, W.Kurcewicz, J.Nyberg, E.-M.Reillo, E.Ruchowska, W.Schwerdtfeger, G.S.Simpson, M.Stanoiu, O.Tengblad, P.G.Thirolf, V.Ugryumov, W.B.Walters

Lifetime measurement of the 167.1 keV state in 41Ar

RADIOACTIVITY 41Cl(β-) [from U(p, X), E=1.4 GeV]; measured Eγ, Iγ, γγ-coin, βγγ-coin, βγ(t). 41Ar; measured half-lives of isomeric states; deduced levels, J, π, multipolarities, B(E2), B(M1).

doi: 10.1103/PhysRevC.76.057303
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2006HO20      Phys.Rev.C 74, 064313 (2006)

N.Hoteling, W.B.Walters, R.V.F.Janssens, R.Broda, M.P.Carpenter, B.Fornal, A.A.Hecht, M.Hjorth-Jensen, W.Krolas, T.Lauritsen, T.Pawlat, D.Seweryniak, X.Wang, A.Wohr, J.Wrzesinski, S.Zhu

Yrast structure of 64Fe

NUCLEAR REACTIONS 238U(64Ni, X)64Fe/69Ga, E=430 MeV; measured prompt and delayed Eγ, Iγ, γγ-coin. 64Fe deduced levels, J, π, configurations. Gammasphere array, comparison with shell model predictions. Level systematics in neighboring nuclides discussed.

doi: 10.1103/PhysRevC.74.064313
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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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2006SE08      Phys.Rev. C 73, 061301 (2006)

D.Seweryniak, K.Starosta, C.N.Davids, S.Gros, A.A.Hecht, N.Hoteling, T.L.Khoo, K.Lagergren, G.Lotay, D.Peterson, A.Robinson, C.Vaman, W.B.Walters, P.J.Woods, S.Zhu

α decay of 105Te

RADIOACTIVITY 105Te(α) [from 50Cr(58Ni, 3n)]; measured Qα, T1/2. Comparison with neighboring isotopes, model predictions.

doi: 10.1103/PhysRevC.73.061301
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2005FO09      Phys.Rev. C 72, 014315 (2005)

D.Fong, J.K.Hwang, A.V.Ramayya, J.H.Hamilton, Y.X.Luo, P.M.Gore, E.F.Jones, W.B.Walters, J.O.Rasmussen, M.A.Stoyer, S.J.Zhu, I.Y.Lee, A.O.Macchiavelli, S.C.Wu, A.V.Daniel, G.M.Ter-Akopian, Yu.Ts.Oganessian, J.D.Cole, R.Donangelo, W.C.Ma

Negative parity bands of 115Pd and band structures in 113, 115, 117Pd

RADIOACTIVITY 252Cf(SF); measured Eγ, Iγ, γγ-coin. 113,115,117Pd deduced levels, J, π. Gammasphere array.

doi: 10.1103/PhysRevC.72.014315
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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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2005RO19      Phys.Rev.Lett. 95, 032502 (2005)

A.P.Robinson, P.J.Woods, D.Seweryniak, C.N.Davids, M.P.Carpenter, A.A.Hecht, D.Peterson, S.Sinha, W.B.Walters, S.Zhu

Ground State Proton Radioactivity from 121Pr: When Was This Exotic Nuclear Decay Mode First Discovered ?

RADIOACTIVITY 121Pr(p) [from 92Mo(36Ar, 6np)]; measured Ep, T1/2. 121Pr deduced ground-state J, deformation. Comparison with previous results.

doi: 10.1103/PhysRevLett.95.032502
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2005RO40      Eur.Phys.J. A 25, Supplement 1, 155 (2005)

A.P.Robinson, C.N.Davids, D.Seweryniak, P.J.Woods, B.Blank, M.P.Carpenter, T.Davinson, S.J.Freeman, N.Hammond, N.Hoteling, R.V.F.Janssens, T.L.Khoo, Z.Liu, G.Mukherjee, C.Scholey, J.Shergur, S.Sinha, A.A.Sonzogni, W.B.Walters, A.Woehr

Recoil decay tagging study of 146Tm

NUCLEAR REACTIONS 58Ni(92Mo, 3np), E not given; measured Eγ, Iγ, γγ-, (recoil)γ-coin. 146Tm deduced levels, J, π. Gammasphere array, recoil-decay tagging.

RADIOACTIVITY 146Tm(p) [from 58Ni(92Mo, X)]; measured Eγ, Ep, T1/2 following proton decay from ground and excited states. 146Tm, 145Er deduced levels, J, π, configurations.

doi: 10.1140/epjad/i2005-06-143-8
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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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2005SE11      Phys.Rev. C 71, 054319 (2005)

D.Seweryniak, J.Uusitalo, P.Bhattacharyya, M.P.Carpenter, J.A.Cizewski, K.Y.Ding, C.N.Davids, N.Fotiades, R.V.F.Janssens, T.Lauritsen, C.J.Lister, A.O.Macchiavelli, D.Nisius, P.Reiter, W.B.Walters, P.J.Woods

Multiparticle configurations in N = 84 isotones located at the proton drip line

NUCLEAR REACTIONS 102Pd(58Ni, 2n), (58Ni, 2np), (58Ni, 2n2p), E=270 MeV; measured Eγ, Iγ, γγ-, (recoil)γ-coin. 156Hf, 157Ta, 158W deduced levels, J, π, isomeric states T1/2. Gammasphere array, recoil-decay tagging, shell model calculations.

doi: 10.1103/PhysRevC.71.054319
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2005SE21      J.Phys.(London) G31, S1503 (2005)

D.Seweryniak, C.N.Davids, A.Robinson, P.J.Woods, B.Blank, M.P.Carpenter, T.Davinson, S.J.Freeman, N.Hammond, N.Hoteling, R.V.F.Janssens, T.L.Khoo, Z.Liu, G.Mukherjee, J.Shergur, S.Sinha, A.A.Sonzogni, W.B.Walters, A.Woehr

Proton decay: spectroscopic probe beyond the proton drip line

RADIOACTIVITY 130Eu, 135Tb, 145,146Tm(p); analyzed proton-decay data.

doi: 10.1088/0954-3899/31/10/021
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2005SE26      Eur.Phys.J. A 25, Supplement 1, 159 (2005)

D.Seweryniak, C.N.Davids, A.Robinson, P.J.Woods, B.Blank, M.P.Carpenter, T.Davinson, S.J.Freeman, N.Hammond, N.Hoteling, R.V.F.Janssens, T.L.Khoo, Z.Liu, G.Mukherjee, J.Shergur, S.Sinha, A.A.Sonzogni, W.B.Walters, A.Woehr

Particle-core coupling in the transitional proton emitters 145, 146, 147Tm

NUCLEAR REACTIONS 58Ni(92Mo, 2np), E=512 MeV; 58Ni(92Mo, 3np), E=460 MeV; 58Ni(92Mo, 4np), E=417 MeV; measured Eγ, Iγ, γγ-, (recoil)γ-coin. 145,146,147Tm deduced levels, J, π, proton-decay features. Gammasphere array, recoil-decay tagging. Comparison with Particle Rotor model predictions.

RADIOACTIVITY 145Tm(p) [from 58Ni(92Mo, 4np)]; measured Ep, Eγ, pγ-coin.

doi: 10.1140/epjad/i2005-06-166-1
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2005SH23      Phys.Rev. C 71, 064321 (2005)

J.Shergur, A.Wohr, W.B.Walters, K.-L.Kratz, O.Arndt, B.A.Brown, J.Cederkall, I.Dillmann, L.M.Fraile, P.Hoff, A.Joinet, U.Koster, B.Pfeiffer

Level structure of odd-odd 134Sb populated in the β- decays of 134, 135Sn

RADIOACTIVITY 134Sn(β-); 135Sn(β-), (β-n); measured Eγ, Iγ, βγ-, γγ-coin. 134Sb deduced levels, J, π, β-decaying isomeric state. Mass separator, shell model calculations.

doi: 10.1103/PhysRevC.71.064321
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2005SH24      Phys.Rev. C 71, 064323 (2005)

J.Shergur, D.J.Dean, D.Seweryniak, W.B.Walters, A.Wohr, P.Boutachkov, C.N.Davids, I.Dillmann, A.Juodagalvis, G.Mukherjee, S.Sinha, A.Teymurazyan, I.Zartova

Identification of low-spin states in 111Sb: Test of spin-orbit coupling in light nuclei

RADIOACTIVITY 111Te(β+), (EC) [from 58Ni(56Fe, n2p)]; measured Eγ, Iγ, γγ-coin, T1/2. 111Sb deduced levels, J, π. Mass separator, comparisons with shell-model predictions and level systematics in neighboring isotopes.

doi: 10.1103/PhysRevC.71.064323
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