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NSR database version of April 24, 2024.

Search: Author = D.Seweryniak

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2024LA01      Phys.Rev. C 109, 024309 (2024)

S.Lalkovski, F.G.Kondev, K.Auranen, A.D.Ayangeakaa, M.P.Carpenter, J.A.Clark, P.Copp, N.P.Giha, D.J.Hartley, T.Lauritsen, S.Marley, G.E.Morgan, C.Muller-Gatermann, S.Nandi, W.Reviol, D.Santiago-Gonzalez, G.Savard, D.Seweryniak, Ir.B.Vasilev, J.Wu

Structure of the high-spin, β-decaying state in the neutron-rich nucleus ¹⁴⁶La

doi: 10.1103/PhysRevC.109.024309
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2024LO03      Nucl.Instrum.Methods Phys.Res. A1062, 169228 (2024)

S.Lopez-Caceres, S.T.Marley, M.P.Carpenter, G.Savard, F.G.Kondev, P.Copp, W.Reviol, C.Muller-Gatermann, D.Seweryniak, J.A.Clark, D.Santiago-Gonzalez, G.E.Morgan, A.J.Mitchell, G.L.Wilson, M.L.Smith

The LSU-Argonne conversion electron spectrometer: A new detector for the X-Array and SATURN decay station

RADIOACTIVITY ¹⁵⁰Ce, ¹⁵⁰Pr(β^-); measured decay products, Eβ, Iβ, X-rays; deduced T_1/2 via conversion electrons emission. Comparison with available data. The LSU-Argonne Conversion Electron Spectrometer (LACES), the ATLAS/CARIBU facility at Argonne National Laboratory.

doi: 10.1016/j.nima.2024.169228
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2024SA09      Phys.Rev. C 109, 024319 (2024)

A.Saracino, S.Zhu, N.Sensharma, A.D.Ayangeakaa, R.V.F.Janssens, Q.B.Chen, M.P.Carpenter, P.Chowdhury, A.Gade, F.G.Kondev, T.M.Kowalewski, T.Lauritsen, E.A.McCutchan, D.Seweryniak

Collective modes of excitation in ⁶⁴Cu

doi: 10.1103/PhysRevC.109.024319
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2024WU04      Phys.Rev. C 109, 024314 (2024)

J.Wu, M.P.Carpenter, F.G.Kondev, R.V.F.Janssens, S.Zhu, E.A.McCutchan, A.D.Ayangeakaa, J.Chen, J.Clark, D.J.Hartley, T.Lauritsen, N.Pietralla, G.Savard, D.Seweryniak, V.Werner

Determination of the spins and parities for the 0₄⁺ and 0₅⁺ states in ¹⁰⁰Zr

doi: 10.1103/PhysRevC.109.024314
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2023AN09      Phys.Rev. C 108, 034303 (2023)

A.N.Andreyev, D.Seweryniak, B.Andel, S.Antalic, D.T.Doherty, A.Korichi, C.Barton, L.Canete, M.P.Carpenter, R.M.Clark, P.A.Copp, J.G.Cubiss, J.Heery, Y.Hrabar, H.Huang, T.Huang, V.Karayonchev, F.G.Kondev, T.Lauritsen, Z.Liu, G.Lotay, C.Muller-Gatermann, S.Nandi, C.Page, D.H.Potterveld, P.H.Regan, W.Reviol, D.Rudolph, M.Siciliano, R.S.Sidhu, A.Sitarcik, P.J.Woods, Z.Yue, W.Zhang

α decay of the neutron-deficient isotope ¹⁹⁰At

doi: 10.1103/PhysRevC.108.034303
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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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2023CA13      Phys.Rev. C 108, 035807 (2023)

L.Canete, D.T.Doherty, G.Lotay, D.Seweryniak, C.M.Campbell, M.P.Carpenter, W.N.Catford, K.A.Chipps, J.Henderson, R.G.Izzard, R.V.F.Janssens, H.Jayatissa, J.Jose, A.R.L.Kennington, F.G.Kondev, A.Korichi, T.Lauritsen, C.Muller-Gatermann, C.Paxman, Zs.Podolyak, B.J.Reed, P.H.Regan, W.Reviol, M.Siciliano, G.L.Wilson, R.Yates, S.Zhu

Confirmation of a new resonance in ²⁶Si and contribution of classical novae to the galactic abundance of ²⁶Al

doi: 10.1103/PhysRevC.108.035807
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Data from this article have been entered in the XUNDL database. For more information, click here.

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 T_1/2. 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.

2023GR04      Phys.Rev.Lett. 130, 242501 (2023)

T.J.Gray, J.M.Allmond, Z.Xu, T.T.King, R.S.Lubna, H.L.Crawford, V.Tripathi, B.P.Crider, R.Grzywacz, S.N.Liddick, A.O.Macchiavelli, T.Miyagi, A.Poves, A.Andalib, E.Argo, C.Benetti, S.Bhattacharya, C.M.Campbell, M.P.Carpenter, J.Chan, A.Chester, J.Christie, B.R.Clark, I.Cox, A.A.Doetsch, J.Dopfer, J.G.Duarte, P.Fallon, A.Frotscher, T.Gaballah, J.T.Harke, J.Heideman, H.Huegen, J.D.Holt, R.Jain, N.Kitamura, K.Kolos, F.G.Kondev, A.Laminack, B.Longfellow, S.Luitel, M.Madurga, R.Mahajan, M.J.Mogannam, C.Morse, S.Neupane, A.Nowicki, T.H.Ogunbeku, W.-J.Ong, C.Porzio, C.J.Prokop, B.C.Rasco, E.K.Ronning, E.Rubino, T.J.Ruland, K.P.Rykaczewski, L.Schaedig, D.Seweryniak, K.Siegl, M.Singh, A.E.Stuchbery, S.L.Tabor, T.L.Tang, T.Wheeler, J.A.Winger, J.L.Wood

Microsecond Isomer at the N=20 Island of Shape Inversion Observed at FRIB

RADIOACTIVITY ³²Na(IT), (β^-) [from ⁹Be(⁴⁸Ca, X), E=172.3 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies, partial level scheme, isomeric T_1/2, B(E2), single-particle occupancies. Comparison with calculations. The Advanced Rare Isotope Separator (ARIS), the FRIB Decay Station initiator (FDSi).

doi: 10.1103/PhysRevLett.130.242501
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Data from this article have been entered in the XUNDL database. For more information, click here.

2023HA30      Phys.Rev. C 108, 024307 (2023)

D.J.Hartley, F.G.Kondev, M.P.Carpenter, J.A.Clark, P.Copp, B.Kay, T.Lauritsen, G.Savard, D.Seweryniak, G.L.Wilson, J.Wu

First b^--decay spectroscopy study of ¹⁵⁷Nd

RADIOACTIVITY ¹⁵⁷Nd(β^-)[from ²⁵²Cf(SF)]; measured Eγ, Iγ, Eβ, Iβ, βγ-coin, βγγ-coin; deduced T_1/2, logft, branchings, β-feedings. ¹⁵⁷Pm; deduced levels, J, π, configurations. Systematics of relative energies of quasiproton orbitals observed in promethium, europium, and terbium N =90, 92, 94, and 96 nuclei - ¹⁵¹Pm, ¹⁵³Pm, ¹⁵⁵Pm, ¹⁵⁷Pm, ¹⁵³Eu, ¹⁵⁵Pm, ¹⁵⁷Pm, ¹⁵⁹Pm, ¹⁵⁵Tb, ¹⁵⁷Tb, ¹⁵⁹Tb, ¹⁶¹Tb. Separated A=157 beam from CARIBU source delivered to the SATURN moving tape collection system, which was surrounded by X-Array spectrometer comprised of 5 germanium clover detectors plastic scintillators.

doi: 10.1103/PhysRevC.108.024307
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Data from this article have been entered in the XUNDL database. For more information, click here.

2023HO06      Phys.Rev. C 107, 064311 (2023)

C.R.Hoffman, R.S.Lubna, E.Rubino, S.L.Tabor, K.Auranen, P.C.Bender, C.M.Campbell, M.P.Carpenter, J.Chen, M.Gott, J.P.Greene, D.E.M.Hoff, T.Huang, H.Iwasaki, F.G.Kondev, T.Lauritsen, B.Longfellow, C.Santamaria, D.Seweryniak, T.L.Tang, G.L.Wilson, J.Wu, S.Zhu

Experimental study of the ³⁸S excited level scheme

NUCLEAR REACTIONS ¹⁸O(²²Ne, 2p)³⁸S, E=48.5 MeV; measured recoils, Eγ, Iγ γγ-coin, γγ(θ) (recoils)γ-coin. ³⁸S; deduced levels, J, π, δ, ratio of the angular yields, configurations, occupancy numbers. Machine-learning techniques used in the analysis of the data. Comparison to shell-model calculations with FSU interaction. Systematics of yrast states properties for ³⁶Si, ³⁸S, ⁴⁰Ar, ⁴²Ca. GRETINA array consisting of 12 HPGe modules coupled with Fragment Mass Analyzer (FMA) at Argonne Tandem Linear Accelerator System (ATLAS) facility (ANL).

doi: 10.1103/PhysRevC.107.064311
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Data from this article have been entered in the XUNDL database. For more information, click here.

2023LU07      Phys.Rev. C 108, 014329 (2023)

R.S.Lubna, S.N.Liddick, T.H.Ogunbeku, A.Chester, J.M.Allmond, S.Bhattacharya, C.M.Campbell, M.P.Carpenter, K.L.Childers, P.Chowdhury, J.Christie, B.R.Clark, R.M.Clark, I.Cox, H.L.Crawford, B.P.Crider, A.A.Doetsch, P.Fallon, A.Frotscher, T.Gaballah, T.J.Gray, R.Grzywacz, J.T.Harke, A.C.Hartley, R.Jain, T.T.King, N.Kitamura, K.Kolos, F.G.Kondev, E.Lamere, R.Lewis, B.Longfellow, S.Lyons, S.Luitel, M.Madurga, R.Mahajan, M.J.Mogannam, C.Morse, S.K.Neupane, W.-J.Ong, D.Perez-Loureiro, C.Porzio, C.J.Prokop, A.L.Richard, E.K.Ronning, E.Rubino, K.Rykaczewski, D.Seweryniak, K.Siegl, U.Silwal, M.Singh, D.P.Siwakoti, D.C.Smith, M.K.Smith, S.L.Tabor, T.L.Tang, V.Tripathi, A.Volya, T.Wheeler, Y.Xiao, Z.Xu

β decay of ³⁶Mg and ³⁶Al: Identification of a β-decaying isomer in ³⁶Al

RADIOACTIVITY ³⁶Mg, ³⁶Al(β^-)[from ⁹Be(⁴⁸Ca, X), E=140 MeV/nucleon for experiment at NSCL and ⁹Be(⁴⁸Ca, X), E=172.3 MeV/nucleon for experiment at FRIB]; ³⁶Al, ^36mAl(β^-)[from ³⁶Mg(β^-); measured Eγ, Iγ; deduced T_1/2. ³⁶Al; deduced levels, J, π, newly-observed β-decaying isomer, T_1/2 of the isomer. ³⁶Si; deduced levels, J, π. Comparison to shell model calculations performed with the FSU interaction using code CoSMo. For experiment at NSCL - CeBr₃ based implantation detector with position-sensitive photomultiplier tube was surrounded by 16 segmented germanium detectors (SeGa) and 15 LaBr₃ detectors. For experiment at FRIB - YSO scintillator based implantation detector segmented into 48x48 pixels was surrounded by 11 HPGe clover detectors and LaBr₃ detectors from one side and the neutron detector array VANDLE from the other side.

doi: 10.1103/PhysRevC.108.014329
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Data from this article have been entered in the XUNDL database. For more information, click here.

2023SE09      Phys.Rev. C 107, L061302 (2023)

D.Seweryniak, T.Huang, K.Auranen, A.D.Ayangeakaa, B.B.Back, M.P.Carpenter, P.Chowdhury, R.M.Clark, P.A.Copp, Z.Favier, K.Hauschild, X.-T.He, T.L.Khoo, F.G.Kondev, A.Korichi, T.Lauritsen, J.Li, C.Morse, D.H.Potterveld, G.Savard, S.Stolze, J.Wu, J.Zhang, Y.-F.Xu

Nuclear rotation at the fission limit in ²⁵⁴Rf

NUCLEAR REACTIONS ²⁰⁶Pb(⁵⁰Ti, 2n)²⁵⁴Rf, E=244 MeV from the ATLAS-ANL facility; measured reaction products, prompt γ rays, Eγ, Iγ, Rf K_α and K_β x-rays, (²⁵⁴Rf implants)γ-coin, (implants)(fission events)γ-coin using the Gammasphere array and the Argonne gas-filled analyzer (AGFA). ²⁵⁴Rf; deduced levels, J, π, ground-state rotational band up to 14+, kinematic moment of inertia. Systematics of ground-state bands in ²⁵⁰Fm, ^252,254No, and ^254,256Rf, and comparison with particle-number conserving cranked shell model (PNC-CSM) calculations.

doi: 10.1103/PhysRevC.107.L061302
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022AY02      Phys.Rev. C 105, 054315 (2022)

A.D.Ayangeakaa, N.Sensharma, M.Fulghieri, R.V.F.Janssens, Q.B.Chen, S.Zhu, M.Alcorta, M.P.Carpenter, P.Chowdhury, A.Gade, C.R.Hoffman, F.G.Kondev, T.Lauritsen, E.A.McCutchan, A.M.Rogers, D.Seweryniak

Single-particle and collective excitations in ⁶⁶Zn

NUCLEAR REACTIONS ²⁶Mg(⁴⁸Ca, 4nα), E=275, 290, 320 MeV; measured Eγ, Iγ, γ(θ), γγ-coin. ⁶⁶Zn; deduced levels, J, π, angular correlation ratios, experimental angular distribution coefficients, δ, rotational bands structure, high-spin states. Comparison to spherical shell-model calculations using the jj44b and JUN45 effective interactions. Experimental data on rotational band is compared to the calculations made within configuration-fixed constrained covariant density functional theory (CDFT) and the quantum particle rotor model (PRM) formalism. Systematics for superderformed bands in ⁶⁰Zn, ⁶⁶Zn, ⁶⁸Zn, ⁶⁸Ge. Gammasphere array with 101 detectors in conjunction with the fragment mass analyzer (FMA) and a microchannel plate (MCP) detector at ATLAS accelerator (ANL).

doi: 10.1103/PhysRevC.105.054315
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022BA42      Phys.Rev. C 106, 064324 (2022)

M.Balogh, E.Jajcisinova, M.Venhart, A.Herzan, J.L.Wood, D.T.Joss, F.A.Ali, K.Auranen, S.Banovska, M.Birova, R.J.Carroll, D.M.Cox, J.G.Cubiss, T.Davis, M.C.Drummond, P.T.Greenlees, T.Grahn, A.Gredley, J.Henderson, U.Jakobsson, R.Julin, S.Juutinen, G.Kantay, J.Konki, P.Konopka, M.Leino, V.Matousek, A.K.Mistry, C.G.McPeake, D.O'Donnell, R.D.Page, J.Pakarinen, P.Papadakis, J.Partanen, P.Peura, P.Rahkila, P.Ruotsalainen, M.Sandzelius, J.Saren, B.Saygi, M.Sedlak, D.Seweryniak, C.Scholey, J.Sorri, A.Spacek, S.Stolze, M.Taylor, A.Thornthwaite, J.Uusitalo, M.Veselsky, S.Vielhauer, F.P.Wearing

New collective structures in ¹⁷⁹Au and their implications for the triaxial deformation of the ¹⁷⁸Pt core

NUCLEAR STRUCTURE ¹⁰⁰Ru(⁸²Kr, 2np)¹⁷⁹Au, E=352 MeV; measured reaction products, Iγ, Eγ, γγ-coin, γγγ-coin, particleγ-coin. ¹⁷⁹Au; deduced levels, J, π, δ, high-spin states, bands structure, rotational bands, configurations, T_1/2 of newly discovered 1743-keV isomeric state; calculated levels, J, π, deformation parameters. Particle-plus-triaxial-rotor model (PTRM) calculations. Suggested strong triaxial deformation of proton-intruder states. RITU gas-filled separator coupled to JUROGAM-II array composed of 10 Eurogam Phase I type coaxial and 24 Euroball clover Ge detectors arranged into three rings and equipped with active BGO Compton-suppression shields. Beam from K130 cyclotron at Accelerator Laboratory of the University of Jyvaskyla.

doi: 10.1103/PhysRevC.106.064324
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022BE27      Nucl.Instrum.Methods Phys.Res. A1040, 167113 (2022)

L.Begley, S.Zhu, M.P.Carpenter, J.T.Anderson, R.V.F.Janssens, T.Lauritsen, E.A.McCutchan, M.B.Oberling, D.Seweryniak, P.Wilt

Algorithms of pulse shape analysis for Gammasphere under high count rate conditions

doi: 10.1016/j.nima.2022.167113
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2022BO04      Phys.Rev. C 105, 044327 (2022)

V.Bothe, S.K.Tandel, S.G.Wahid, P.C.Srivastava, B.Bhoy, P.Chowdhury, R.V.F.Janssens, F.G.Kondev, M.P.Carpenter, T.Lauritsen, D.Seweryniak, S.Zhu

Isomers in ²⁰³Tl and core excitations built on a five-nucleon-hole structure

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)²⁰³Tl, E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγγ-coin. ²⁰³Tl; deduced levels, J, π, multipolarities, T_1/2 of high-spin isomeric states, configurations. Half-lives determined by centroid-shift method for ns isomers and by variation with time of the cumulative intensity for υs isomers. Observed octupole core excitations built on a five-nucleon hole configuration. Comparison with shell-model calculations employing the KHH7B effective interaction. Gammasphere array with 100 detectors at ATLAS accelerator (ANL).

doi: 10.1103/PhysRevC.105.044327
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022CR03      Phys.Rev.Lett. 129, 212501 (2022)

H.L.Crawford, V.Tripathi, J.M.Allmond, B.P.Crider, R.Grzywacz, S.N.Liddick, A.Andalib, E.Argo, C.Benetti, S.Bhattacharya, C.M.Campbell, M.P.Carpenter, J.Chan, A.Chester, J.Christie, B.R.Clark, I.Cox, A.A.Doetsch, J.Dopfer, J.G.Duarte, P.Fallon, A.Frotscher, T.Gaballah, T.J.Gray, J.T.Harke, J.Heideman, H.Heugen, R.Jain, T.T.King, N.Kitamura, K.Kolos, F.G.Kondev, A.Laminack, B.Longfellow, R.S.Lubna, S.Luitel, M.Madurga, R.Mahajan, M.J.Mogannam, C.Morse, S.Neupane, A.Nowicki, T.H.Ogunbeku, W.-J.Ong, C.Porzio, C.J.Prokop, B.C.Rasco, E.K.Ronning, E.Rubino, T.J.Ruland, K.P.Rykaczewski, L.Schaedig, D.Seweryniak, K.Siegl, M.Singh, S.L.Tabor, T.L.Tang, T.Wheeler, J.A.Winger, Z.Xu

Crossing N = 28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

RADIOACTIVITY ^44,45P, ^42,43Si, ^39,40,41Al, ^36,37,38Mg, ³⁵Na, ³²Ne, ²⁹F(β^-), (β^-n), (β^-2n) [from ⁹Be(⁴⁸Ca, X), E=172.3 MeV/nucleon]; measured decay products, Eβ, Iβ, En, In; deduced T_1/2. Comparison with the latest quasiparticle random phase approximation and shell-model calculations and available data. The Facility for Rare Isotope Beams (FRIB) with the FRIB decay station initiator.

doi: 10.1103/PhysRevLett.129.212501
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022GR08      Phys.Lett. B 834, 137446 (2022)

T.J.Gray, J.M.Allmond, R.V.F.Janssens, W.Korten, A.E.Stuchbery, J.L.Wood, A.D.Ayangeakaa, S.Bottoni, B.M.Bucher, C.M.Campbell, M.P.Carpenter, H.L.Crawford, H.David, D.T.Doherty, P.Fallon, M.T.Febbraro, A.Galindo-Uribarri, C.J.Gross, M.Komorowska, F.G.Kondev, T.Lauritsen, A.O.Macchiavelli, P.Napiorkowsi, E.Padilla-Rodal, S.D.Pain, W.Reviol, D.G.Sarantites, G.Savard, D.Seweryniak, C.Y.Wu, C.-H.Yu, S.Zhu

E2 rotational invariants of 0₁⁺ and 2₁⁺ states for ¹⁰⁶Cd: The emergence of collective rotation

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁰⁶Cd, ¹⁰⁶Cd'), E=3.849 MeV/nucleon; measured Doppler-corrected γ-ray spectra, Eγ, Iγ, (¹⁰⁶Cd)γ-coin using GRETINA array with 32 HPGe crystals for γ detection, and CHICO array for particles at the ATLAS-ANL facility. ¹⁰⁶Cd; deduced levels, J, π, E2 and E3 matrix elements using GOSIA analysis code, E2 transition strengths, spectroscopic quadrupole moments, electric quadrupole invariants (Kumar-Cline sum rules) Q³cos(3δ), axial-symmetry parameter δ. Comparison with beyond mean-field (BMF) and shell-model calculations, and with previous experimental data.

doi: 10.1016/j.physletb.2022.137446
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Data from this article have been entered in the XUNDL database. For more information, click here.

2022HA01      Phys.Rev. C 105, 014301 (2022)

D.J.Hartley, F.G.Kondev, M.P.Carpenter, R.V.F.Janssens, M.A.Riley, K.Villafana, K.Auranen, A.D.Ayangeakaa, J.S.Baron, A.J.Boston, J.A.Clark, J.P.Greene, J.Heery, C.R.Hoffman, T.Lauritsen, J.Li, D.Little, E.S.Paul, G.Savard, D.Seweryniak, J.Simpson, S.Stolze, G.L.Wilson, J.Wu, S.Zhu

νi_13/2 structures in ¹⁵⁵Sm and ¹⁵⁹Gd: Supporting evidence of a Z=60 deformed subshell gap

NUCLEAR REACTIONS ¹⁵⁴Sm(¹⁶⁰Gd, n), E=1000 MeV from the ATLAS facility of the Argonne National Laboratory. Measured Eγ, Iγ, γγ-coin using Gammasphere array with 73 Compton-suppressed HPGe detectors. ¹⁵⁵Sm, ¹⁵⁹Gd; deduced high-spin levels, J, π, νi_13/2 bands, with the two signature partners, alignments and signature splitting. Discussed systematics of νi_13/2 structures in N=91, 93, 95, and 97 isotopes: ^153,155,157Sm, ^155,157,159Gd, ^157,159,161Dy, ¹⁵¹Ce, ^153,155Nd, ^161,163Er, ^163,165Yb.

doi: 10.1103/PhysRevC.105.014301
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2022HU09      Phys.Lett. B 833, 137345 (2022)

H.Huang, W.Q.Zhang, A.N.Andreyev, Z.Liu, D.Seweryniak, Z.H.Li, C.Y.Guo, A.E.Barzakh, P.Van Duppen, B.Andel, S.Antalic, M.Block, A.Bronis, M.P.Carpenter, P.Copp, J.G.Cubiss, B.Ding, D.T.Doherty, Z.Favier, F.Giacoppo, T.H.Huang, B.Kindler, F.G.Kondev, T.Lauritsen, J.G.Li, G.S.Li, B.Lommel, H.Y.Lu, M.Al Monthery, P.Mosat, Y.F.Niu, C.Raison, W.Reviol, G.Savard, S.Stolze, G.L.Wilson, H.Y.Wu, Z.H.Wang, F.R.Xu, Q.B.Zeng, X.H.Yu, F.F.Zeng, X.H.Zhou

First observation of the decay of the 13/2⁺ isomer in ¹⁸³Hg and B(M2) systematics of neutron transitions across the nuclear chart

RADIOACTIVITY ¹⁸³Hg(α) [from ¹⁸⁷Pb α decay]; ^187mPb(α) [from ¹⁴²Nd(⁵⁰Cr, 3n2pγ), E=255 MeV, followed by separation of fragments using Argonne gas-filled analyzer (AGFA) at the ATLAS-ANL facility]; measured reaction products, evaporation residues (EVRs), Eα, Iα, (EVR)α-correlations, αγ(t), Eγ, Iγ, x rays, T_1/2 using double-sided silicon strip detector (DSSD), and four HPGe clover detectors. ^183,183mHg; deduced levels, isomer, J, π, T_1/2 of g.s. and isomer, α branching ratio, K-conversion coefficient, multipolarity, B(M2), Nilsson configurations. ^187mPb; deduced T_1/2. Systematics of decay schemes of 13/2+ isomers in ^{175,177,179,181,183,185}Hg. Systematics of B(M2) values for 7/2-, 9/2+, 11/2- and 13/2+ isomers in even-Z, odd-N nuclei: ²⁵Mg, ³³Si, ^33,35S, ³⁷Ar, ³⁹Ca, ⁵⁹Cr, ⁶¹Fe, ^63,67Ni, ^63,65,67Zn, ^67,69,71Ge, ^69,71Se, ^97,99Mo, ^99,101,103Ru, ^103,105Pd, ^107,109Cd, ^{109,111,113,115}Sn, ¹⁵³Yb, ¹⁶¹Hf, ¹⁶³W, ¹⁶³Os, ^171,189,191Pt, ^{181,183,201,203,205}Hg, ²⁰⁹Pb, ^205,207,211Po, ^207,209,213Rn, ^209,211Ra, ^211,213Th.

doi: 10.1016/j.physletb.2022.137345
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2022HU21      Phys.Rev. C 106, L061301 (2022)

T.Huang, D.Seweryniak, B.B.Back, P.C.Bender, M.P.Carpenter, P.Chowdhury, R.M.Clark, P.A.Copp, X.-T.He, R.D.Herzberg, D.E.M.Hoff, H.Jayatissa, T.L.Khoo, F.G.Kondev, G.Morgan, C.Morse, A.Korichi, T.Lauritsen, C.Muller-Gatermann, D.H.Potterveld, W.Reviol, A.M.Rogers, S.Saha, G.Savard, K.Sharma, S.Stolze, S.Waniganeththi, G.L.Wilson, J.Wu, Y.-F.Xu, S.Zhu

Discovery of the new isotope ²⁵¹Lr: Impact of the hexacontetrapole deformation on single-proton orbital energies near the Z=100 deformed shell gap

NUCLEAR REACTIONS ²⁰³Tl(⁵⁰Ti, 2n)²⁵¹Lr, ²⁰⁵Tl(⁵⁰Ti, 2n)²⁵³Lr, E=237 MeV; measured reaction products, α-decay of the reaction products, Eα, Iα. ^251,253Lr; deduced levels J, π, α-decay width. ^251,253,255Lr; calculated single-proton levels near the Fermi surface. Calculations with particle-number conserving cranked shell model. Beam delivered to target by ATLAS linear accelerator and recoiling reaction products were separated in the Argonne Gas-Filled Analyzer (AGFA) at (ANL). Decay of the implanted reaction products was measured in pixelized double-sided Si strip detector (DSSD).

RADIOACTIVITY ^251,253Lr(α)[from ^203,205Tl(⁵⁰Ti, 2n), E=237 MeV]; measured Eα, Iα; deduced T_1/2, Q-value, α-decay branchings and widths. Comparison to other experimental data. and predictions of theoretical models.

doi: 10.1103/PhysRevC.106.L061301
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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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2022LO05      Phys.Rev. C 105, L042801 (2022)

G.Lotay, D.T.Doherty, R.V.F.Janssens, D.Seweryniak, H.M.Albers, S.Almaraz-Calderon, M.P.Carpenter, A.E.Champagne, C.J.Chiara, C.R.Hoffman, C.Iliadis, A.Kankainen, T.Lauritsen, S.Zhu

Revised decay properties of the key 93-keV resonance in the ²⁵Mg(p, γ) reaction and its influence on the MgAl cycle in astrophysical environments

NUCLEAR REACTIONS ¹¹B(¹⁶O, n), E=19 MeV; measured Eγ, Iγ, γ(θ), γγγ-coin. ²⁶Al; deduced levels J, π, branchings. Obtained ground state branching for 93-keV resonance of ²⁵Mg+p system which corresponds to 6398 keV level in ²⁶Al. Comparison to other experimental data. Discussed impact on the production of cosmic γ rays. Gammasphere array with 99 detectors at ATLAS accelerator (ANL).

doi: 10.1103/PhysRevC.105.L042801
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2022RU06      Phys.Rev. C 106, 034318 (2022)

J.Rufino, Jr., E.A.McCutchan, S.Zhu, A.A.Sonzogni, M.Alcorta, P.F.Bertone, M.P.Carpenter, J.Clark, C.R.Hoffman, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, C.J.Lister, R.Pardo, A.Rogers, G.Savard, D.Seweryniak, R.Vondrasek

β decay of ¹⁴¹Ba

RADIOACTIVITY ¹⁴¹Ba(β^-)[from β^- decay of ¹⁴¹Cs beam produced as fission fragment in ²⁵²Cf(SF) at the CARIBU-ANL facility]; measured Eγ, Iγ, γγ-coin, γγ(θ) using the GAMMASPHERE array with 99 Compton-suppressed HPGe detectors. ¹⁴¹La; deduced levels, J, π, multipolarities, multipole mixing ratios, β feedings, logft. Comparison with previous experimental results, including total absorption gamma-spectra (TAGS) data, and with evaluated data in the ENSDF database. Relevance to decay heat in reactors, and reactor antineutrino spectrum. Decay-scheme figure is given in the Supplemental material of the paper.

doi: 10.1103/PhysRevC.106.034318
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2022SE03      Phys.Rev. C 105, 044315 (2022)

N.Sensharma, A.D.Ayangeakaa, R.V.F.Janssens, Q.B.Chen, S.Zhu, M.Alcorta, M.P.Carpenter, E.A.McCutchan, F.G.Kondev, T.Lauritsen, D.Seweryniak, C.R.Hoffman, A.M.Rogers, A.Gade, T.Baugher, P.Chowdhury

Single-particle and dipole excitations in ⁶²Co

NUCLEAR REACTIONS ²⁶Mg(⁴⁸Ca, 3np2α), E=275, 290, 320 MeV; measured Eγ, Iγ, γ(θ), γγ-coin. ⁶²Co; deduced levels, J, π, angular correlation ratios, experimental angular distribution coefficients, multipolarities, rotational bands structures. Comparison to shell-model calculations using the GXPF1A two-body effective interaction. Systematics for magnetic rotational bands in ⁶⁰Co, ⁶¹Co, ⁶²Co, ⁵⁸Fe. Gammasphere array with 101 detectors in conjunction with the fragment mass analyzer (FMA) and a microchannel plate (MCP) detector at ATLAS accelerator (ANL).

doi: 10.1103/PhysRevC.105.044315
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2022SU19      Phys.Rev. C 106, 024316 (2022)

S.Suman, S.K.Tandel, S.G.Wahid, T.Manu, M.Hemalatha, B.Maheshwari, A.K.Jain, P.Chowdhury, R.V.F.Janssens, F.G.Kondev, M.P.Carpenter, T.Lauritsen, D.Seweryniak

Successive neutron alignments in the yrast, negative-parity band of oblate-deformed ¹⁹⁹Tl

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹⁹Tl, E=1450 MeV; measured Eγ, Iγ, γγ-coin using Gammasphere array with 100 Compton-suppressed HPGe detectors at the ATLAS-ANL accelerator facility. ¹⁹⁹Tl; deduced high-spin levels, J, π, alignments, signature slitting, B(M1)/B(E2), configurations, oblate deformation. ¹⁹⁹Tl; calculated total energy surfaces in (ϵ cosγ, ϵ sinγ) plane, neutron- and proton-quasiparticle levels for oblate deformation as function of angular frequency with principal axis cranking (PAC) and tilted axis cranking (TAC) models using the ultimate cranker (UC) code.

doi: 10.1103/PhysRevC.106.024316
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2022WA20      Phys.Lett. B 832, 137262 (2022)

S.G.Wahid, S.K.Tandel, S.Suman, P.C.Srivastava, A.Kumar, P.Chowdhury, F.G.Kondev, R.V.F.Janssens, M.P.Carpenter, T.Lauritsen, D.Seweryniak, S.Zhu

Emergence of an island of extreme nuclear isomerism at high excitation near ²⁰⁸Pb

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁷Pb, X)²⁰⁴Pb/²⁰⁵Bi/²⁰⁶Bi, E=1430 MeV; ¹⁹⁷Au(²⁰⁷Pb, X)²⁰⁴Pb/²⁰⁵Bi/²⁰⁶Bi, E=1450 MeV; measured Eγ, Iγ, γγ-coin, delayed γ spectra, T_1/2 of isomers by γγ(t) using pulsed beam from ATLAS-ANL facility, and Gammasphere array for γ detection. ²⁰⁴Pb, ^205,206Bi; deduced levels, isomers, J, π, configurations, nuclear isomerism from core-excited configurations in the vicinity of ²⁰⁸Pb. Comparison with shell-model predictions.

COMPILATION ⁹³Nb, ⁹³Mo, ¹⁴⁰Nd, ¹⁴⁴Pm, ¹⁴⁸Tb, ^212,213Fr, ²⁰⁴Pb, ^205,206Bi; compiled T_1/2 of isomers of >1 micro-sec half-life above 7-MeV excitations across the nuclear chart. ^{202,203,204,205}Tl, ^202,203,204Pb, ²⁰⁶Bi, ²¹³At, ^210,211,212Rn, ^209,211,212Fr; compiled B(E3) for isomer decays.

doi: 10.1016/j.physletb.2022.137262
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2022ZH22      Phys.Lett. B 829, 137129 (2022)

W.Q.Zhang, A.N.Andreyev, Z.Liu, D.Seweryniak, H.Huang, Z.H.Li, J.G.Li, C.Y.Guo, D.T.Doherty, A.E.Barzakh, P.Van Duppen, J.G.Cubiss, B.Andel, S.Antalic, M.Block, A.Bronis, M.P.Carpenter, P.Copp, B.Ding, Z.Favier, F.Giacoppo, T.H.Huang, X.H.Yu, B.Kindler, F.G.Kondev, T.Lauritsen, G.S.Li, B.Lommel, H.Y.Lu, M.Al Monthery, P.Mosat, Y.F.Niu, C.Raison, W.Reviol, G.Savard, S.Stolze, G.L.Wilson, H.Y.Wu, Z.H.Wang, F.R.Xu, Q.B.Zeng, X.H.Zhou

First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic ¹⁸⁷Pb

NUCLEAR REACTIONS ¹⁴²Nd(⁵⁰Cr, 3n2p)¹⁸⁷Pb, E=255 MeV beam from ATLAS-ANL facility, followed by separation of evaporation residues (EVRs) using Argonne Gas-Filled Analyzer; measured Eα, Eγ, Iγ, x rays, αγ-coin, γγ-coin, T_1/2 of a new low-energy microsec-isomer by αγ(t) using Gammasphere for γ detection and double-sided silicon strip detector (DSSD) for EVRs and α particles. Recoil-decay tagging (RDT) and isomer-decay tagging (IDT) methods. ¹⁸⁷Pb; deduced high-spin levels, J, π, isomer, K-conversion coefficient, multipolarity, bands, B(E2), B(M1)/B(E2), triple-shape coexistence at low energy. Comparison with band structure in ¹⁸⁵Hg. Systematics of aligned angular momenta plots and experimental Routhians for bands in ^183,185Hg, ¹⁸⁷Pb. ¹⁸⁴Hg, ¹⁸⁶Pb, ¹⁸⁷Tl; observed γ rays. ^186,187m,188Pb; observed α-decay peaks.

doi: 10.1016/j.physletb.2022.137129
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2022ZH46      Phys.Rev. C 106, 024317 (2022)

W.Q.Zhang, A.N.Andreyev, Z.Liu, D.Seweryniak, H.Huang, Z.H.Li, J.G.Li, C.Y.Guo, A.E.Barzakh, P.Van Duppen, M.Al Monthery, B.Andel, S.Antalic, M.Block, A.Bronis, M.P.Carpenter, P.Copp, J.G.Cubiss, B.Ding, D.T.Doherty, Z.Favier, F.Giacoppo, T.H.Huang, B.Kindler, F.G.Kondev, T.Lauritsen, G.S.Li, B.Lommel, H.Y.Lu, P.Mosat, Y.F.Niu, C.Raison, W.Reviol, G.Savard, S.Stolze, G.L.Wilson, H.Y.Wu, Z.H.Wang, F.R.Xu, X.H.Yu, Q.B.Zeng, X.H.Zhou

Identification of excited states in ¹⁸⁸Bi and ¹⁸⁸Po

NUCLEAR REACTIONS ¹⁴²Nd(⁵⁰Cr, 3np)¹⁸⁸Bi, (⁵⁰Cr, 4n)¹⁸⁸Po, E=255 MeV; measured evaporation residues (EVRs), Eα, Eγ, Iγ, x rays, (EVR)γ-coin, αγ-coin, γγ-coin, using four clover HPGe detectors, Gammasphere array with 64 Compton-suppressed HPGe detectors, and DSSD and DSSD+Sibox at the ATLAS-ANL accelerator facility. ^{186,187,187m,188}Pb, ^189,189mBi; deduced recoil-decay tagging (RDT) γ-ray yields. ¹⁸⁸Bi; deduced levels, J, π, isomer, T_1/2 and decay modes of isomer, K-conversion coefficients, multipolarities, configurations. ¹⁸⁸Po; deduced energy of the first 2+ level. ¹⁸⁶Pb; deduced levels, J, π. ^183,184,186Hg, ^{186,187,187m,188}Pb, ^188,189,189mBi; observed Eα. Systematics of 9/2-, 1/2+, 7/2- and 13/2+ level energies in ^{185,187,189,191,193,195}Bi, and those of first 2+, 4+, 6+ and 8+, second 0+, 2+ and 4+ in ^{188,190,192,194,196,198,200,202,204,206,208,210}Po.

doi: 10.1103/PhysRevC.106.024317
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2021CA19      Phys.Rev. C 104, L022802 (2021)

L.Canete, G.Lotay, G.Christian, D.T.Doherty, W.N.Catford, S.Hallam, D.Seweryniak, H.M.Albers, S.Almaraz-Calderon, E.A.Bennett, M.P.Carpenter, C.J.Chiara, J.P.Greene, C.R.Hoffman, R.V.F.Janssens, J.Jose, A.Kankainen, T.Lauritsen, A.Matta, M.Moukaddam, S.Ota, A.Saastamoinen, R.Wilkinson, S.Zhu

New constraints on the ²⁵Al (p, γ) reaction and its influence on the flux of cosmic γ rays from classical nova explosions

NUCLEAR REACTIONS ¹¹B(¹⁶O, p)²⁶Mg, E=19 MeV from Argonne ATLAS accelerator; measured Eγ, Iγ, γγ-coin, γ(θ) and level half-lives by DSAM using Gammasphere array of 99 HPGe detectors. ²H(²⁵Mg, p)²⁶Mg, E=10 MeV/nucleon from Texas A and M cyclotron; measured outgoing protons and scattered deuterons using the TIARA Si array, and ²⁶Mg recoils by the MDM-2 magnetic spectrometer with Oxford ionization chamber, angular distributions of scattered deuterons and protons. ²⁶Mg; deduced levels, J, π, resonances, spectroscopic factors. ²⁶Si; deduced levels, resonances, J, π, Γ_p, Γ_γ, resonance strengths by comparing with the level structures of mirror nucleus ²⁶Mg. ²⁵Al(p, γ)²⁶Si, T=0.2-0.4 GK; deduced stellar reaction rate by considering the contribution of resonant states in ²⁶Si, galactic abundance of ²⁶Al from classical novae; performed nova outburst simulations using the hydrodynamic Lagrangian time-implicit code SHIVA.

doi: 10.1103/PhysRevC.104.L022802
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2021DO08      Phys.Rev.Lett. 127, 202501 (2021)

D.T.Doherty, A.N.Andreyev, D.Seweryniak, P.J.Woods, M.P.Carpenter, K.Auranen, A.D.Ayangeakaa, B.B.Back, S.Bottoni, L.Canete, J.G.Cubiss, J.Harker, T.Haylett, T.Huang, R.V.F.Janssens, D.G.Jenkins, F.G.Kondev, T.Lauritsen, C.Lederer-Woods, J.Li, C.Muller-Gatermann, D.Potterveld, W.Reviol, G.Savard, S.Stolze, S.Zhu

Solving the Puzzles of the Decay of the Heaviest Known Proton-Emitting Nucleus ¹⁸⁵Bi

RADIOACTIVITY ¹⁸⁵Bi(p), (α), (IT) [from ⁹⁵Mo(⁹³Nb, 3n), E=424 MeV]; measured decay products, Eγ, Iγ, Eα, Iα, Ep, Ip, α-γ- and π-γ-coin.; deduced γ-ray energies, decay levels schemes, T_1/2, high-spin states, reassignment of the ground-state lifetime, proton-decay spectroscopic factor. Fragment Mass Analyzer and Argonne Gas-Filled Analyzer at Argonne National Laboratory's ATLAS facility.

doi: 10.1103/PhysRevLett.127.202501
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2021HA01      Phys.Rev.Lett. 126, 042701 (2021)

S.Hallam, G.Lotay, A.Gade, D.T.Doherty, J.Belarge, P.C.Bender, B.A.Brown, J.Browne, W.N.Catford, B.Elman, A.Estrade., M.R.Hall, B.Longfellow, E.Lunderberg, F.Montes, M.Moukaddam, P.O'Malley, W.-J.Ong, H.Schatz, D.Seweryniak, K.Schmidt, N.K.Timofeyuk, D.Weisshaar, R.G.T.Zegers

Exploiting Isospin Symmetry to Study the Role of Isomers in Stellar Environments

NUCLEAR REACTIONS ¹²C, ²H(²⁶Si, ¹¹C), (²⁶Si, p)²⁷Si, E=30 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, partial σ, branching ratios, J, π, spectroscopic factors. Comparison with shell model calculations, REACLIB data. GRETINA array.

doi: 10.1103/PhysRevLett.126.042701
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2021HA14      Phys.Rev. C 103, 034322 (2021)

D.J.Hartley, K.Villafana, F.G.Kondev, M.A.Riley, R.V.F.Janssens, K.Auranen, A.D.Ayangeakaa, J.S.Baron, A.J.Boston, M.P.Carpenter, J.A.Clark, J.P.Greene, J.Heery, C.R.Hoffman, P.Jackson, T.Lauritsen, J.Li, D.Little, E.S.Paul, G.Savard, D.Seweryniak, J.Simpson, S.Stolze, G.L.Wilson, J.Wu, S.Zhu, S.Frauendorf

Possible quenching of static neutron pairing near the N=98 deformed shell gap: Rotational structures in ^{160, 161}Gd

NUCLEAR REACTIONS ¹⁵⁴Sm, ¹⁶⁴Dy(¹⁶⁰Gd, X)¹⁶⁰Gd/¹⁶¹Gd, E=1000 MeV; measured Eγ, Iγ, γγ-coin using the Gammasphere array with 73 detectors at ATLAS-ANL facility. ^160,161Gd; deduced high-spin levels, J, π, rotational bands, branching ratios, B(M1)/B(E2), Nilsson configurations, alignments, neutron pairing strength. Comparison with structure of ν5/2[523] band in N=97 isotone ¹⁵⁹Sm.

doi: 10.1103/PhysRevC.103.034322
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2021KA05      Phys.Lett. B 813, 136033 (2021)

A.Kankainen, P.J.Woods, D.T.Doherty, H.M.Albers, M.Albers, A.D.Ayangeakaa, M.P.Carpenter, C.J.Chiara, J.L.Harker, R.V.F.Janssens, C.Lederer-Woods, D.Seweryniak, F.Strieder, S.Zhu

Decay of the key 92-keV resonance in the ²⁵Mg(p, γ) reaction to the ground and isomeric states of the cosmic γ-ray emitter ²⁶Al

NUCLEAR REACTIONS ²⁴Mg(³He, p), E=10 MeV; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies and intensities, γ-ray branches, J, π.

doi: 10.1016/j.physletb.2020.136033
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2021KE04      Phys.Rev. C 103, 035805 (2021)

A.R.L.Kennington, G.Lotay, D.T.Doherty, D.Seweryniak, C.Andreoiu, K.Auranen, M.P.Carpenter, W.N.Catford, C.M.Deibel, K.Hadynska-Klek, S.Hallam, D.Hoff, T.Huang, R.V.F.Janssens, S.Jazrawi, J.Jose, F.G.Kondev, T.Lauritsen, J.Li, A.M.Rogers, J.Saiz, G.Savard, S.Stolze, G.L.Wilson, S.Zhu

Level structure of the T_z = -1 nucleus ³⁴Ar and its relevance for nucleosynthesis in ONe novae

NUCLEAR REACTIONS ¹²C(²⁴Mg, 2n)³⁴Ar, (²⁴Mg, 2p)³⁴S, E=95 MeV; measured reaction products, Eγ, Iγ, (³⁴Ar)γ- and (³⁴S)γ-coin, γγ-coin, γ(θ) using GRETINA array for detection of high-energy γ rays, and Fragment mass analyzer (FMA) for recoils at ATLAS-ANL facility. ³⁴Ar, ³⁴S; deduced levels, proton-unbound levels of astrophysical significance, J, π, mirror symmetry, ³³S/³²S and ³⁴S/³²S ratios to search for nova presolar grains, and compared with previous experimental data. ³⁴Cl(p, γ), T=0.1-0.8 GK; calculated stellar reaction rate. Comparison of levels structures in ³⁴Ar and ³⁴S with data from the ENSDF database, and with shell-model calculations using USDA Hamiltonian, within the sd shell-model space for even-parity states, and using WBP Hamiltonian, within the sd-pf space for odd-parity levels.

doi: 10.1103/PhysRevC.103.035805
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2021MI07      Phys.Rev. C 103, 024323 (2021)

A.J.Mitchell, R.Orford, G.J.Lane, C.J.Lister, P.Copp, J.A.Clark, G.Savard, J.M.Allmond, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, P.Chowdhury, D.A.Gorelov, R.V.F.Janssens, F.G.Kondev, U.Patel, D.Seweryniak, M.L.Smith, Y.Y.Zhong, S.Zhu

Ground-state and decay properties of neutron-rich ¹⁰⁶Nb

RADIOACTIVITY ¹⁰⁶Nb(β^-)[from ²⁵²Cf(SF), CARIBU radioactive-ion-beam facility at ANL, followed by mass separation and measurement using Multi-Reflection Time-of-Flight (MR-TOF) mass separator and Canadian Penning Trap (CPT)]; measured CPT spectra, Eγ, Iγ, βγγ-coin, half-life of ¹⁰⁶Nb decay using five HPGe clover detectors, and a plastic scintillator at the X-Array and SATURN decay-spectroscopy station. ¹⁰⁶Mo; deduced levels, J, π, apparent β feedings, range of logft values, configurations. ¹⁰⁶Nb; discussed spin, parity and configurations of the ground state. Comparison with earlier experimental results.

ATOMIC MASSES ¹⁰⁶Nb; measured cyclotron frequency using the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) technique, CPT spectra; deduced mass excess. Comparison with previous measurement, and with AME 2016 evaluation.

doi: 10.1103/PhysRevC.103.024323
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2021PR11      Phys.Rev. C 104, 044318 (2021)

V.S.Prasher, A.J.Mitchell, C.J.Lister, P.Chowdhury, L.Afanasieva, M.Albers, C.J.Chiara, M.P.Carpenter, D.Cline, N.D'Olympia, C.J.Guess, A.B.Hayes, C.R.Hoffman, R.V.F.Janssens, B.P.Kay, T.L.Khoo, A.Korichi, T.Lauritsen, E.Merchan, Y.Qiu, D.Seweryniak, R.Shearman, S.K.Tandel, A.Verras, C.Y.Wu, S.Zhu

Shapes, softness, and nonyrast collectivity in ¹⁸⁶W

NUCLEAR REACTIONS ¹⁸⁶W(¹³⁶Xe, ¹³⁶Xe')¹⁸⁶W, E=725, 800 MeV from ATLAS-ANL facility; measured scattered beam- and target-like ions using Rochester-Livermore 4π CHICO2 array, Eγ, Iγ, γγ- and (particle)γ-coin, gγ(θ)(DCO) using Gammasphere array. ¹⁸⁶W; deduced high-spin levels, J, π, Kπ, multipolarities, rotational bands, odd-even staggering parameters S(J) for bands and compared with predictions for an axially symmetric rotor, a rigid asymmetric rotor and a γ-unstable nucleus, B(E1) ratios. Systematics of E(first 2+), E(first 4+)/E(first 2+), E(second 2+)/E(first 2+), E(second 0+)/E(first 2+) for A=178-188 even-A W isotopes, and staggering parameters for ^{178,180,182,184,186,188}W, ^178,180Hf, ¹⁸⁸Os.

doi: 10.1103/PhysRevC.104.044318
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2021RU07      Phys.Rev. C 103, 034306 (2021)

D.Rudolph, I.Ragnarsson, R.M.Clark, C.Andreoiu, M.P.Carpenter, J.Ekman, C.Fahlander, F.G.Kondev, T.Lauritsen, D.G.Sarantites, D.Seweryniak, C.E.Svensson

Low-, medium-, and high-spin states in the N=Z + 1 nucleus ⁶³Ga

NUCLEAR REACTIONS ⁴⁰Ca(²⁸Si, pα)⁶³Ga, E=122 MeV; measured Eγ, Iγ, γγ-, and (particle)γ-coin, γγ(θ)(DCO) using Gammasphere and Microball arrays at ATLAS-ANL facility. ⁶³Ga; deduced high-spin levels, J, π, multipolarities, rotational bands, configurations, alignments. Comparison with shell-model calculations for low-spin levels, and cranked Nilsson-Strutinsky calculations for high-spin bands.

NUCLEAR STRUCTURE ⁶³Ga; calculated levels, J, π, rotational bands, level half-lives, magnetic dipole and electric quadrupole moments, γ-branching ratios, γ-mixing ratios, configurations. Shell-model calculations, with JUN45, FPD6, KB3G and GXPF1A interactions using ANTOINE code. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.034306
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2021RU09      Phys.Rev. C 104, 044314 (2021)

D.Rudolph, C.Andreoiu, M.A.Bentley, M.P.Carpenter, R.J.Charity, R.M.Clark, J.Ekman, C.Fahlander, P.Fallon, W.Reviol, D.G.Sarantites, D.Seweryniak

Experimental and shell-model study of excited states in ⁵⁵₂₆Fe₂₉ and related notes on ⁵⁵₂₉Cu₂₆

NUCLEAR REACTIONS ²⁸Si(³²S, n4p)⁵⁵Fe, E=125 MeV; measured Eγ, Iγ, (particle)γ-, γγ-coin, γγ(θ)(DCO) using the Gammasphere array for γ detection, 4π Microball system for charged particle detection, and the Neutron Shell array for neutron detection at ANL-ATLAS and LBNL cyclotron facilities. ⁵⁵Fe; deduced high-spin levels, J, π, multipolarities, dipole structure, configurations. Comparison with shell-model calculations.

NUCLEAR STRUCTURE ⁵⁵Fe, ⁵⁵Cu; calculated high-spin levels, J, π, level half-lives, B(E2), B(M1), γ-branching ratios, configurations, occupation numbers relative to ⁵⁶Ni. Shell-model calculations with KB3G and GXPF1A interactions, with isospin breaking terms, using ANTOINE code. Comparison with experimental data.

doi: 10.1103/PhysRevC.104.044314
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2021SU02      Phys.Rev. C 103, 014319 (2021)

S.Suman, S.K.Tandel, A.Kumawat, S.G.Wahid, M.Hemalatha, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu

Nanosecond isomers and the evolution of collectivity in stable, even-A Hg isotopes

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X), E=1450 MeV; ¹⁹⁷Au(²⁰⁷Pb, X), E=1430 MeV; measured Eγ, Iγ, three- and higher fold γγ-coin, γγ(θ)(DCO), half-lives of nanosecond isomers by γγ(t) using pulsed beams from ATLAS-ANL accelerator, and Gammasphere array of 100 Compton-suppressed HPGe detectors. ^198,200,202Hg; deduced levels, J, π, multipolarities, B(E2), configurations, band crossings, and collectivity; calculated total energy surface plots, neutron and proton quasiparticle energy levels using the Ultimate Cranker code. Systematics of nanosecond isomers, half-lives and B(E2) in ^{192,194,196,198,200,202,204}Hg.

doi: 10.1103/PhysRevC.103.014319
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2020HA03      Phys.Rev. C 101, 015804 (2020)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

γ-ray spectroscopy of astrophysically important states in ³⁹Ca

NUCLEAR REACTIONS ⁴⁰Ca(³He, αγ)³⁹Ca, E=30 MeV; Measured Eγ, Iγ, Eα, Iα, αγ-coin, reaction products using the GODDESS array (Gammasphere for γ detection and ORRUBA for particle detection) at the ATLAS-ANL facility. ³⁹Ca; deduced levels, J, π, γ-branching ratios. ³⁸K(p, γ)³⁹Ca, T=0.1-0.4 GK; deduced resonance parameters, astrophysical reaction rates. Discussed impact on abundances of isotopes created at the endpoint of nova nucleosynthesis.

doi: 10.1103/PhysRevC.101.015804
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2020HA31      Phys.Rev. C 102, 045802 (2020)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

¹⁹Ne level structure for explosive nucleosynthesis

NUCLEAR REACTIONS ¹⁹F(³He, t)¹⁹Ne, E=30 MeV; measured reaction products, E(t), I(t), Eγ, Iγ, (triton)γ-, and (triton)γγ-coin using ORRUBA array with Micron QQQ5 telescopes for tritons and Gammasphere array for γ rays at ATLAS-ANL facility. ¹⁹Ne; deduced levels, J, π, γ-branching ratios. Comparison with earlier experimental results and with evaluated data. ¹⁸F(p, α)¹⁵O, E(cm)<0.9 MeV; calculated astrophysical S factors, and reaction rates at temperature of 0.06 to 0.4 GK.

doi: 10.1103/PhysRevC.102.045802
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2020KE03      Phys.Rev.Lett. 124, 252702 (2020)

A.R.L.Kennington, G.Lotay, D.T.Doherty, D.Seweryniak, C.Andreoiu, K.Auranen, M.P.Carpenter, W.N.Catford, C.M.Deibel, K.Hadynska-Klek, S.Hallam, D.E.M.Hoff, T.Huang, R.V.F.Janssens, S.Jazrawi, J.Jose, F.G.Kondev, T.Lauritsen, J.Li, A.M.Rogers, J.Saiz, G.Savard, S.Stolze, G.L.Wilson, S.Zhu

Search for Nova Presolar Grains: γ-Ray Spectroscopy of ³⁴Ar and its Relevance for the Astrophysical ³³Cl(p, γ) Reaction

NUCLEAR REACTIONS ¹²C(²⁴Mg, X)³⁴Ar, E=95 MeV; measured reaction products, Eγ, Iγ. ³⁴Cl, ³⁴S; deduced γ-ray energies, intensities, J, π, contribution of individual resonances to the stellar reaction rate.

doi: 10.1103/PhysRevLett.124.252702
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2020LO11      Phys.Rev. C 102, 035804 (2020)

G.Lotay, D.T.Doherty, D.Seweryniak, M.P.Carpenter, R.V.F.Janssens, J.Jose, A.M.Rogers, P.J.Woods, S.Zhu

Spectroscopy of ³⁰P and the abundance of ²⁹Si in presolar grains

NUCLEAR REACTIONS ²⁸Si(³He, p), E=13 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), γγ(θ)(DCO) using the Gammasphere array of 97 Compton-suppressed HPGe detectors at ATLAS-ANL facility. ³⁰P; deduced levels, resonances, J, π, and compared with evaluated data in the ENSDF database. ²⁹Si(p, γ)³⁰P, E(proton resonance)=2-500 keV; deduced spectroscopic factors, Γ_p, Γ_γ, resonance strengths, astrophysical reaction rates from 0.08 to 0.5 GK. Evaluated mean composition of nova ejecta of ^28,29,30Si, ³¹P, ^32,33,34S from models of nova explosions and compared with data in STARLIB database.

doi: 10.1103/PhysRevC.102.035804
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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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2020MO36      Phys.Rev. C 102, 054328 (2020)

C.Morse, A.O.Macchiavelli, H.L.Crawford, S.Zhu, C.Y.Wu, Y.Y.Wang, J.Meng, B.B.Back, B.Bucher, C.M.Campbell, M.P.Carpenter, J.Chen, R.M.Clark, M.Cromaz, P.Fallon, J.Henderson, R.V.F.Janssens, M.D.Jones, T.L.Khoo, F.G.Kondev, T.Lauritsen, I.Y.Lee, J.Li, D.Potterveld, C.Santamaria, G.Savard, D.Seweryniak, S.Stolze, D.Weisshaar

Quadrupole and octupole collectivity in ¹⁴³Ba

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁴³Ba, ¹⁴³Ba'), E=627.8 MeV, [¹⁴³Ba beam from ²⁵²Cf SF at the CARIBU facility at ATLAS-ANL]; measured reaction products, Eγ, Iγ, scattered particles, (particle)γ-coin, and half-life of the first 9/2- level from (particle)γ-coin using GRETINA array of 11 Quad detector modules, each with four 36-fold segmented HPGe crystals for γ detection and CHICO2 array of 20 Parallel Plate Avalanche Counters (PPACs). ¹⁴³Ba; deduced levels, J, π, Coulomb excitation γ-ray yields, E2 matrix elements using GOSIA least-squares analysis, B(E2), upper limit for E3 matrix element and B(E3), alignment plots, doubly decoupled structure. Comparison with Reflection-Asymmetric Triaxial Particle Rotor Model (RAT-PRM) calculations.

doi: 10.1103/PhysRevC.102.054328
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2020RU03      Phys.Rev. C 102, 014313 (2020)

D.Rudolph, I.Ragnarsson, S.AAberg, C.Andreoiu, M.P.Carpenter, R.M.Clark, J.Ekman, C.Fahlander, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, D.G.Sarantites, D.Seweryniak, C.E.Svensson

Onset of high-spin rotational bands in the N=Z nucleus ⁶²Ga

NUCLEAR REACTIONS ⁴⁰Ca(²⁸Si, npα), E=122 MeV; measured Eγ, Iγ, (particle)γ- and γγ-coin, γγ(θ)(DCO) using the Gammasphere array and the 4π Microball system for charged particle detection at the ANL-ATLAS facility. ⁶²Ga; deduced high-spin levels, J, π, multipolarities, band structures, alignments, and configurations; calculated energy surface contours in (ϵ₂, γ) plane. Comparison with cranked Nilsson-Strutinsky (CNS) calculations.

doi: 10.1103/PhysRevC.102.014313
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2020RU04      Phys.Rev. C 102, 014316 (2020)

D.Rudolph, I.Ragnarsson, C.Andreoiu, M.A.Bentley, M.P.Carpenter, R.J.Charity, R.M.Clark, J.Ekman, C.Fahlander, P.Fallon, W.Reviol, D.G.Sarantites, D.Seweryniak

Single-particle and collective excitations in the N=28 isotones ⁵⁴Fe and ⁵³Mn

NUCLEAR REACTIONS ²⁸Si(³²S, 3pα)⁵³Mn, (³²S, 2pα)⁵⁴Fe, E=125 MeV; measured Eγ, Iγ, E(n), (particle)γ- and γγ-coin, γγ(θ)(DCO) using the Gammasphere array for γ detection, 4π Microball system for charged particle detection, and the Neutron Shell for neutron detection at ANL-ATLAS and LBNL facilities. ⁵³Mn, ⁵⁴Fe; deduced high-spin levels, J, π, multipolarities, band structures, alignments and configurations. Comparison with cranked Nilsson-Strutinsky calculations, and with large-scale shell model calculations in the fp shell with GXPF1A and KB3G interactions and isospin breaking terms.

doi: 10.1103/PhysRevC.102.014316
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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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2020WA24      Phys.Rev. C 102, 024329 (2020)

S.G.Wahid, S.K.Tandel, S.Suman, M.Hemalatha, A.Patel, P.Roy, A.Y.Deo, Pragati, P.C.Srivastava, B.Bhoy, S.S.Bhattacharjee, R.P.Singh, S.Muralithar, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, S.Rai, A.Sharma

Metastable states from multinucleon excitations in ²⁰²Tl and ²⁰³Pb

NUCLEAR REACTIONS ¹⁹⁸Pt(⁷Li, 3n)²⁰²Tl, E=31-36 MeV; ¹⁹⁷Au(²⁰⁹Bi, X), E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), γγ(linear polarization), half-lives of isomers by γ(t) and centroid-shift method using the INGA array at IUAC-New Delhi for the ²⁰²Tl experiment, and Gammasphere array at the ATLAS-ANL facility for ²⁰³Pb. ²⁰²Tl, ²⁰³Pb; deduced high-spin levels, isomers, J, π, multipolarities, B(E2), B(E3), configurations. Systematics of energies and B(Eλ) for isomers in ^202,203,204Tl and ^203,204,205Pb. Comparison with shell-model calculations.

doi: 10.1103/PhysRevC.102.024329
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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, T_1/2, mass excesses, branching ratio. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2019.03.039
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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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2019DE15      Phys.Rev. C 99, 044604 (2019)

V.V.Desai, W.Loveland, K.McCaleb, R.Yanez, G.Lane, S.S.Hota, M.W.Reed, H.Watanabe, S.Zhu, K.Auranen, A.D.Ayangeakaa, M.P.Carpenter, J.P.Greene, F.G.Kondev, D.Seweryniak, R.V.F.Janssens, P.A.Copp

The ¹³⁶Xe + ¹⁹⁸Pt reaction: A test of models of multi-nucleon transfer reactions

NUCLEAR REACTIONS ¹⁹⁸Pt(¹³⁶Xe, X)⁴³K/^69mZn/⁷²Zn/⁷²As/⁷³Ga/⁹⁶Nb/⁹⁷Zr/⁹⁹Mo/^99mTc/¹⁰⁵Rh/¹¹⁰In/¹¹²Pd/^115mIn/^120mSb/¹²²Sb/¹²⁴I/¹²⁵Xe/¹²⁶Sb/¹²⁷Sb/¹²⁷Xe/¹²⁷Cs/¹²⁸Sb/¹³⁰I/¹³²I/^131mTe/¹³¹Ba/¹³²I/¹³²Cs/¹³³I/^133mXe/¹³⁵I/¹³⁵Xe/^135mBa/¹³⁶Cs/¹⁴⁰Ba/¹⁴⁰La/¹⁴²Pr/¹⁴³Ce/¹⁵³Sm/¹⁵⁴Tb/¹⁵⁷Dy/¹⁶⁹Lu/¹⁷³Hf/¹⁷⁵Hf/¹⁷⁶Ta/¹⁷⁷Ta/^180mHf/¹⁸¹Re/¹⁸²Re/¹⁸²Os/¹⁸³Os/¹⁸⁴Ta/¹⁸⁸Re/¹⁸⁸Ir/¹⁸⁹Re/¹⁹⁰Ir/¹⁹¹Pt/¹⁹³Au/¹⁹⁴Ir/¹⁹⁴Au/^195mIr/^195mPt/^195mHg/^196mIr/^196mAu/¹⁹⁷Hg/¹⁹⁸Au/¹⁹⁹Au/^200mAu/²⁰⁰Tl/²⁰⁰Pb/²⁰¹Tl/²⁰¹Pb/²⁰²Tl/^202mPb/²⁰³Hg/²⁰³Pb/²⁰⁴Bi, E=760.5 MeV; measured Eγ, Iγ, cumulative and independent yields and σ of projectile-like, fission and target-like fragments using Gammasphere array for online γ detection and an HPGe detector for offline γ spectroscopy at ATLAS-ANL facility. Comparison with predictions of GRAZING, di-nuclear systems (DNS), and improved quantum molecular dynamics (ImQMD) models for multi-nucleon transfer reactions, and with previous experimental results.

doi: 10.1103/PhysRevC.99.044604
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetC2398.

2019GA29      Phys.Rev. C 100, 044309 (2019)

E.R.Gamba, A.M.Bruce, S.Lalkovski, M.Rudigier, S.Bottoni, M.P.Carpenter, S.Zhu, J.T.Anderson, A.D.Ayangeakaa, T.A.Berry, I.Burrows, M.Carmona-Gallardo, R.J.Carroll, P.Copp, D.M.Cullen, T.Daniel, G.Fernandez-Martinez, J.P.Greene, L.A.Gurgi, D.J.Hartley, R.Ilieva, S.Ilieva, F.G.Kondev, T.Kroll, G.J.Lane, T.Lauritsen, I.Lazarus, G.Lotay, C.R.Nita, Zs.Podolyak, V.Pucknell, M.Reed, P.H.Regan, J.Rohrer, J.Sethi, D.Seweryniak, C.M.Shand, J.Simpson, M.Smolen, E.A.Stefanova, V.Vedia, O.Yordanov

Fast-timing measurements in the ground-state band of ¹¹⁴Pd

RADIOACTIVITY ²⁵²Cf(SF); measured Eγ, Iγ, γγ-coin, level half-lives by fast-timing γγ(t) technique using Gammasphere array with 51 HPGe detectors, and FATIMA array with 25 LaBr₃(Ce) detectors at the Argonne National Laboratory. ¹¹⁴Pd; deduced levels, J, π, half-lives for the first 2+, 4+ and 6+ states, B(E2), transition quadrupole moments, β₂. Comparison of experimental B(E2) values with those predicted by the vibrator, rigid axial rotor, Wilets-Jean and Davydov-Filippov models. Systematics of B(E2) values for the first 2+ state in Z=44-48, N=56-74 even-even nuclei.

doi: 10.1103/PhysRevC.100.044309
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2019HA08      Phys.Rev.Lett. 122, 052701 (2019)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

Key ¹⁹Ne States Identified Affecting γ-Ray Emission from ¹⁸F in Novae

NUCLEAR REACTIONS ¹⁹F(³He, t)¹⁹Ne, E=30 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, S-factor, reaction rates, resonance energies. Comparison with available data.

doi: 10.1103/PhysRevLett.122.052701
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2019HA14      Phys.Rev. C 99, 035805 (2019)

M.R.Hall, D.W.Bardayan, T.Baugher, A.Lepailleur, S.D.Pain, A.Ratkiewicz, S.Ahn, J.M.Allen, J.T.Anderson, A.D.Ayangeakaa, J.C.Blackmon, S.Burcher, M.P.Carpenter, S.M.Cha, K.Y.Chae, K.A.Chipps, J.A.Cizewski, M.Febbraro, O.Hall, J.Hu, C.L.Jiang, K.L.Jones, E.J.Lee, P.D.O'Malley, S.Ota, B.C.Rasco, D.Santiago-Gonzalez, D.Seweryniak, H.Sims, K.Smith, W.P.Tan, P.Thompson, C.Thornsberry, R.L.Varner, D.Walter, G.L.Wilson, S.Zhu

New γ-ray transitions observed in ¹⁹Ne with implications for the ¹⁵O(α, γ)¹⁹Ne reaction rate

NUCLEAR REACTIONS ¹⁹F(³He, t), E=30 MeV; measured triton spectra, Eγ, Iγ, tγ- and γγ-coin using Gammasphere array for γ detection with the silicon detector array ORRUBA Dual Detectors for Experimental Structure Studies (GODDESS) at ATLAS-ANL facility. ¹⁹Ne; deduced levels, J, π, and γ-branching ratios for the decay of 4.14- and 4.20-MeV states. ¹⁵O(α, γ)¹⁹Ne, E≈18-180 keV; calculated fractional contribution of the corrected branching ratios for the 4.14 MeV, 7/2- and 4.20 MeV, 9/2- states in ¹⁹Ne to astrophysical reaction rate, which is of significance in breakout from the hot CNO cycle in type I x-ray bursts. Comparison with previous experimental values.

doi: 10.1103/PhysRevC.99.035805
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2019LO09      Eur.Phys.J. A 55, 109 (2019)

G.Lotay, D.T.Doherty, D.Seweryniak, S.Almaraz-Calderon, M.P.Carpenter, C.J.Chiara, H.M.David, C.R.Hoffman, R.V.F.Janssens, A.Kankainen, T.Lauritsen, R.Wilkinson, P.J.Woods, S.Zhu

Identification of γ-decaying resonant states in ²⁶Mg and their importance for the astrophysical s process

doi: 10.1140/epja/i2019-12791-5
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2019NE06      Phys.Rev. C 100, 014329 (2019)

D.Negi, S.K.Tandel, P.Chauhan, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu

Decoupled and semi-decoupled bands in ¹⁹⁷Hg and ¹⁹⁹Hg

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹⁷Hg/¹⁹⁹Hg, E=1450 MeV; measured Eγ, Iγ, γγ-coin, and γγ(θ)(DCO) using Gammasphere array at ATLAS-ANL facility. ^197,199Hg; deduced high-spin levels, J, π, bands, decoupled positive-parity sequences, alignments, configurations, transition from oblate collective rotation at low spin to triaxial noncollective shapes at high spin; calculated quasiparticle levels and total energy surfaces using Ultimate Cranker calculations with standard Nilsson parameters. Systematics of positive-parity levels in A=193-200 even- and odd-A Hg isotopes.

doi: 10.1103/PhysRevC.100.014329
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2019PA57      Nucl.Instrum.Methods Phys.Res. B438, 172 (2019)

R.C.Pardo, T.Palchan-Hazan, R.Scott, M.Paul, O.Nusair, W.Bauder, R.Vondrasek, D.Seweryniak, S.Baker, R.Talwar, P.Collon, F.G.Kondev, G.Youinou, M.Salvatores, G.Palmiotti, J.Berg, J.Giglio, M.T.Giglio, G.Imel, C.Nair, C.L.Jiang

Laser Ablation Positive-Ion AMS of Neutron Activated Actinides

NUCLEAR REACTIONS ²³⁶U, ²⁴²Pu(n, X), E not given; measured reaction products; deduced neutron transmutation rates by accelerator mass spectrometry.

doi: 10.1016/j.nimb.2018.05.004
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2019RO12      Phys.Rev. C 100, 024320 (2019)

P.Roy, S.K.Tandel, S.Suman, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu

Isomers from intrinsic excitations in ²⁰⁰Tl and ^{201, 202}Pb

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁷Pb, X), ²⁰⁰Tl/²⁰¹Pb/²⁰²Pb, E=1430 MeV; measured Eγ, Iγ, three- and higher-fold γγ-coin, half-lives of isomers by γγ(t) using Gammasphere array with 100 Compton-suppressed HPGe detectors at ATLAS-ANL facility. ²⁰⁰Tl, ^201,202Pb; deduced high-spin levels, isomers, multipolarities from intensity balances, B(E2), B(E3), configurations. Systematics of 13/2+ isomers in ^197,199,201Pb, and 5+ and 7+ isomers in ^196,198,200Tl.

doi: 10.1103/PhysRevC.100.024320
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2019SE06      Phys.Lett. B 792, 170 (2019), Erratum Phys.Lett. B 820, 136556 (2021)

N.Sensharma, U.Garg, S.Zhu, A.D.Ayangeakaa, S.Frauendorf, W.Li, G.H.Bhat, J.A.Sheikh, M.P.Carpenter, Q.B.Chen, J.L.Cozzi, S.S.Ghugre, Y.K.Gupta, D.J.Hartley, K.B.Howard, R.V.F.Janssens, F.G.Kondev, T.C.McMaken, R.Palit, J.Sethi, D.Seweryniak, R.P.Singh

Two-phonon wobbling in ¹³⁵Pr

NUCLEAR STRUCTURE ¹³⁵Pr; analyzed available data; deduced wobbling. Comparison with theoretical calculations in the framework of the quasiparticle triaxial rotor and triaxial projected shell models.

doi: 10.1016/j.physletb.2019.03.038
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2019SH34      Phys.Rev. C 100, 034309 (2019)

U.Shirwadkar, S.K.Tandel, P.Chowdhury, T.L.Khoo, I.Ahmad, M.P.Carpenter, J.P.Greene, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Peterson, D.Seweryniak, X.Wang, S.Zhu

Decay spectroscopy of two-quasiparticle K isomers in ^{246, 248}Cm via inelastic and transfer reactions

NUCLEAR REACTIONS ²⁴⁸Cm(²⁰⁹Bi, ²⁰⁹Bi'), ²⁴⁸Cm(²⁰⁹Bi, X)²⁴⁶Cm, E=1450 MeV from ATLAS-ANL accelerator facility, with bursts between 1 μs to 8 s; measured Eγ, Iγ, γγ-coin, half-lives of isomers in ²⁴⁶Cm and ²⁴⁸Cm by γ(t) using Gammasphere array. ^246,248Cm; deduced levels, J, π, K-isomers, two-quasineutron Nilsson configurations, reduced K hindrances, persistence of a deformed subshell gap at N=152 near Z≈100 from systematics of Kπ=8-, two-quasineutron isomeric states in N=150, Z=94-102 even-even nuclei.

doi: 10.1103/PhysRevC.100.034309
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2019WA22      Phys.Rev. C 100, 014328 (2019)

S.G.Wahid, S.K.Tandel, P.Chowdhury, R.V.F.Janssens, M.P.Carpenter, T.L.Khoo, F.G.Kondev, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, Q.B.Chen, J.Meng

Structure of odd-A Pt isotopes along the line of stability

NUCLEAR REACTIONS ¹⁹⁷Au(²⁰⁹Bi, X)¹⁹³Pt/¹⁹⁵Pt/¹⁹⁷Pt, E=1450 MeV; measured Eγ, Iγ, γγ-coin, γγ(θ)(DCO), half-lives of isomers by centroid-shift technique using the Gammasphere array at ATLAS-ANL facility. ^193,195,197Pt; deduced levels, J, π, multipolarities, alignments, configurations. Comparison with theoretical calculations.

NUCLEAR STRUCTURE ^193,195,197Pt; calculated levels, J, π, total energy surfaces, and B(E2); deduced shapes and band crossings. Tilted axis cranking covariant density functional theory (TAC-CDFT) using the Ultimate Cranker code. Comparison with experimental data. Systematics of positive-parity levels in A=189-196 even- and odd-A Pt isotopes.

doi: 10.1103/PhysRevC.100.014328
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2019ZH49      Phys.Lett. B 799, 135036 (2019)

G.X.Zhang, H.Watanabe, G.D.Dracoulis, F.G.Kondev, G.J.Lane, P.H.Regan, P.-A.Soderstrom, P.M.Walker, K.Yoshida, H.Kanaoka, Z.Korkulu, P.S.Lee, J.J.Liu, S.Nishimura, J.Wu, A.Yagi, D.S.Ahn, T.Alharbi, H.Baba, F.Browne, A.M.Bruce, M.P.Carpenter, R.J.Carroll, K.Y.Chae, C.J.Chiara, Zs.Dombradi, P.Doornenbal, A.Estrade, N.Fukuda, C.Griffin, E.Ideguchi, N.Inabe, T.Isobe, S.Kanaya, I.Kojouharov, T.Kubo, S.Kubono, N.Kurz, I.Kuti, S.Lalkovski, T.Lauritsen, C.S.Lee, E.J.Lee, C.J.Lister, G.Lorusso, G.Lotay, E.A.McCutchan, C.-B.Moon, I.Nishizuka, C.R.Nita, A.Odahara, Z.Patel, V.H.Phong, Zs.Podolyak, O.J.Roberts, H.Sakurai, H.Schaffner, D.Seweryniak, C.M.Shand, Y.Shimizu, T.Sumikama, H.Suzuki, H.Takeda, S.Terashima, Zs.Vajta, J.J.Valiente-Dobon, Z.Y.Xu, S.Zhu

Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in ¹⁶⁸Dy and ¹⁶⁹Dy

RADIOACTIVITY ^168,169Dy(β^-) [from be(²³⁸U, X), E=345 MeV/nucleon]; measured decay products, Eγ, Iγ, X-rays; deduced level energies, J, π, B(E2), isomer T_1/2. Comparison with deformed QRPA and multi-quasiparticle calculations.

doi: 10.1016/j.physletb.2019.135036
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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, T_1/2. A heavy self-conjugate nucleus, comparison with available data.

doi: 10.1103/PhysRevLett.121.182501
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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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2018CH13      Nature(London) 554, 7691 (2018)

C.J.Chiara, J.J.Carroll, M.P.Carpenter, J.P.Greene, D.J.Hartley, R.V.F.Janssens, G.J.Lane, J.C.Marsh, D.A.Matters, M.Polasik, J.Rzadkiewicz, D.Seweryniak, S.Zhu, S.Bottoni, A.B.Hayes, S.A.Karamian

Isomer depletion as experimental evidence of nuclear excitation by electron capture

NUCLEAR REACTIONS ⁷Li(⁹⁰Zr, 3np), E=840 MeV; measured Eγ, Iγ, γγγ-coin using Gammasphere array at ATLAS-ANL. ⁹³Mo; deduced levels, first experimental evidence of process of nuclear excitation by electron capture (NEEC) through the isomer depletion of 2425-keV isomer and excitation of the 2430-keV intermediate level from the 2425-keV isomer, and observation of 2475-268-685-1478 γ cascade in coincidence.

NUCLEAR REACTIONS ⁹⁰Zr(⁷Li, 3np), E(cm)=same as above for reverse kinematic reaction; measured Eγ, Iγ, γγ-coin at Australian National Laboratory. ⁹³Mo; deduced levels, non-observation of 2475- and 268-keV γ rays in γγ coincidences in the normal kinematics reaction consistent with NEEC interpretation in the inverse kinematic reaction study at Argonne.

doi: 10.1038/nature25483
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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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2018GA23      Acta Phys.Pol. B49, 555 (2018)

E.R.Gamba, A.M.Bruce, M.Rudigier, S.Lalkovski, S.Bottoni, M.P.Carpenter, S.Zhu, A.D.Ayangeakaa, J.T.Anderson, T.A.Berry, I.Burrows, R.J.Carrol, P.Copp, M.Carmona-Gallardo, D.M.Cullen, T.Daniel, G.Fernandez-Martinez, J.P.Greene, L.A.Gurgi, D.J.Hartley, R.Ilieva, S.Ilieva, R.V.F.Janssens, F.G.Kondev, T.Kroll, G.J.Lane, T.Lauritsen, I.Lazarus, G.Lotay, C.R.Nita, Zs.Podolyak, V.Pucknell, M.Reed, P.H.Regan, J.Rohrer, J.Sethi, D.Seweryniak, C.M.Shand, J.Simpson, M.Smolen, V.Vedia, E.A.Stefanova, O.Yordanov

Fast-timing Measurements in ¹⁰⁰Zr Using LaBr₃(Ce) Detectors Coupled with Gammasphere

RADIOACTIVITY ²⁵²Cf(SF); measured ¹⁰⁰Zr fission fragment 4⁺ state Eγ, Iγ, T_1/2, fission partners fragments using Digital Gammasphere (DGS) acquisition with hybrid detector made of 51 HPGe from Gammasphere and 25 LaBr3(Ce) scintillators (part of UK NuSTAR Collaboration); deduced first excited state T_1/2, deformation, quadrupole moment, B(E2), LaBr3(Ce) γ-γ matrix, DGS γ-γ matrix, centroid difference between delayed and anti-delayed time distributions. Results preliminary, the main aim was the feasibility study.

doi: 10.5506/aphyspolb.49.555
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2018HA19      Phys.Rev.Lett. 120, 182502 (2018)

D.J.Hartley, F.G.Kondev, R.Orford, J.A.Clark, G.Savard, A.D.Ayangeakaa, S.Bottoni, F.Buchinger, M.T.Burkey, M.P.Carpenter, P.Copp, D.A.Gorelov, K.Hicks, C.R.Hoffman, C.Hu, R.V.F.Janssens, J.W.Klimes, T.Lauritsen, J.Sethi, D.Seweryniak, K.S.Sharma, H.Zhang, S.Zhu, Y.Zhu

Masses and β-Decay Spectroscopy of Neutron-Rich Odd-Odd ^{160, 162}Eu Nuclei: Evidence for a Subshell Gap with Large Deformation at N=98

RADIOACTIVITY ^160,162Eu(β^-); measured decay products, Eγ, Iγ; deduced γ-ray energies, partial level scheme, T_1/2.

ATOMIC MASSES ^160,162Eu; measured frequency ratios; deduced mass excess (ME) for the ground and isomeric states.

doi: 10.1103/PhysRevLett.120.182502
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2018JI01      Phys.Rev. C 97, 012801 (2018)

C.L.Jiang, D.Santiago-Gonzalez, S.Almaraz-Calderon, K.E.Rehm, B.B.Back, K.Auranen, M.L.Avila, A.D.Ayangeakaa, S.Bottoni, M.P.Carpenter, C.Dickerson, B.DiGiovine, J.P.Greene, C.R.Hoffman, R.V.F.Janssens, B.P.Kay, S.A.Kuvin, T.Lauritsen, R.C.Pardo, J.Sethi, D.Seweryniak, R.Talwar, C.Ugalde, S.Zhu, D.Bourgin, S.Courtin, F.Haas, M.Heine, G.Fruet, D.Montanari, D.G.Jenkins, L.Morris, A.Lefebvre-Schuhl, M.Alcorta, X.Fang, X.D.Tang, B.Bucher, C.M.Deibel, S.T.Marley

Reaction rate for carbon burning in massive stars

NUCLEAR REACTIONS ¹²C(¹²C, p)²³Na, (¹²C, α)²⁰Ne, E=5.5-10 MeV; measured Eγ, Iγ, (particle)γ-coin, σ(E) using Gammasphere array and an array of three annular double-sided silicon strip detectors at the ATLAS-ANL facility; deduced S factors and astrophysical reaction rates. Comparison with previous measurements, and with data from other reactions. Relevance to carbon burning is a critical phase for nucleosynthesis in massive stars.

doi: 10.1103/PhysRevC.97.012801
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2018WA22      Phys.Rev. C 98, 024313 (2018)

R.Wadsworth, N.S.Kelsall, D.G.Jenkins, I.Ragnarsson, S.M.Fischer, D.P.Balamuth, P.A.Hausladen, G.C.Ball, M.P.Carpenter, R.V.F.Janssens, T.Lauritsen, C.J.Lister, D.Seweryniak, R.M.Clark, P.Fallon, A.O.Macchiavelli, C.E.Svensson, S.J.Freeman, D.G.Sarantites

Terminating states in the positive-parity structures of ⁶⁷As

NUCLEAR REACTIONS ⁴⁰Ca(³⁶Ar, p2α), E=145 MeV; measured Eγ, Iγ, γγ- and (particle)γ-coin, γγ(θ)(DCO) using Gammasphere array for γ detection, and MICROBALL CsI array for charged particles at ATLAS-ANL facility. ⁶⁷As; deduced levels, J, π, multipolarities, bands, and noncollective terminating states; calculated tilted Fermi-surface plots for protons and neutrons. Comparison with configuration dependent cranked Nilsson-Strutinsky calculations.

doi: 10.1103/PhysRevC.98.024313
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2018WI09      Phys.Rev. C 98, 041302 (2018)

W.Witt, V.Werner, N.Pietralla, M.Albers, A.D.Ayangeakaa, B.Bucher, M.P.Carpenter, D.Cline, H.M.David, A.Hayes, C.Hoffman, R.V.F.Janssens, B.P.Kay, F.G.Kondev, W.Korten, T.Lauritsen, O.Moller, G.Rainovski, G.Savard, D.Seweryniak, J.Smith, R.Stegmann, S.Zhu, C.Y.Wu

Sub-shell closure and shape coexistence in the transitional nucleus ⁹⁸Zr

NUCLEAR REACTIONS ¹⁹⁶Pt(⁹⁸Zr, ⁹⁸Zr'), E=464 MeV from CARIBU source at ATLAS-ANL facility; measured recoils, Eγ, Iγ, (recoil)γ-coin using CHICO2 array of segmented parallel-plate avalanche counter (PPAC) for recoil detection, and GRETINA array of segmented HPGe detectors for γ detection. Coulomb excitation. ⁹⁸Zr; deduced levels, upper limit of B(E2) for the first 2+ state. Comparison with shell model and Monte-Carlo shell model calculations, and with previous experimental values. Systematics of B(E2) values for the first 2+ states in ^{90,92,94,96,98,100,102,104,106}Zr.

doi: 10.1103/PhysRevC.98.041302
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2017AF02      Phys.Rev. C 96, 035801 (2017)

L.Afanasieva, J.C.Blackmon, C.M.Deibel, J.Lai, L.E.Linhardt, B.C.Rasco, D.Seweryniak, M.Alcorta, M.P.Carpenter, J.A.Clark, C.R.Hoffman, R.V.F.Janssens, S.Zhu

γ spectroscopy of states in ³²Cl relevant for the ³¹S(p, γ)³²Cl reaction rate

NUCLEAR REACTIONS ¹⁰B(²⁴Mg, 2n)³²Cl, E=75 MeV; measured Eγ, Iγ, γγ-, (³²Cl recoils)γ-, and (³²Cl recoils)γγ-coin using Fragment Mass Analyzer (FMA) and Gammasphere array at ATLAS-ANL facility. ³²Cl; deduced levels, J, π, energies, strengths, σ, Γ_γ and Γ_p of resonances. ³¹S(p, γ)³²Cl, T=0.1-1.0 GK; deduced astrophysical reaction rates.

doi: 10.1103/PhysRevC.96.035801
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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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2017BU07      Phys.Rev.Lett. 118, 152504 (2017)

B.Bucher, S.Zhu, C.Y.Wu, R.V.F.Janssens, R.N.Bernard, L.M.Robledo, T.R.Rodriguez, D.Cline, A.B.Hayes, A.D.Ayangeakaa, M.Q.Buckner, C.M.Campbell, M.P.Carpenter, J.A.Clark, H.L.Crawford, H.M.David, C.Dickerson, J.Harker, C.R.Hoffman, B.P.Kay, F.G.Kondev, T.Lauritsen, A.O.Macchiavelli, R.C.Pardo, G.Savard, D.Seweryniak, R.Vondrasek

Direct Evidence for Octupole Deformation in ¹⁴⁶Ba and the Origin of Large E1 Moment Variations in Reflection-Asymmetric Nuclei

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁴⁶Ba, ¹⁴⁶Ba'), E=659 MeV; measured reaction products, Eγ, Iγ. ^144,146,148Ba; deduced energy levels, J, π, B(Eλ), quadrupole and octupole deformation parameters. Calculated HFB potential energy surfaces, neutron single-particle energies. Coulomb excitation, comparison with available data.

doi: 10.1103/PhysRevLett.118.152504
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2017DI02      Phys.Rev. C 95, 024301 (2017)

B.Ding, Z.Liu, D.Seweryniak, P.J.Woods, H.L.Wang, J.Yang, H.L.Liu, C.N.Davids, M.P.Carpenter, T.Davinson, R.V.F.Janssens, R.D.Page, A.P.Robinson, J.Shergur, S.Sinha, S.Zhu, X.D.Tang, J.G.Wang, T.H.Huang, W.Q.Zhang, M.D.Sun, X.Y.Liu, H.Y.Lu

First identification of excited states in ¹¹⁷Ba using the recoil-β-delayed proton tagging technique

NUCLEAR REACTIONS ⁶⁴Zn(⁵⁸Ni, 3n2p), E=305 MeV; measured Eγ, Iγ, (delayed protons)γ-coin, recoil-βp decay tagging using fragment mass analyzer (FMA), and Gammasphere array at ATLAS-ANL facility. ¹¹⁷Ba; deduced high-spin levels, J, π, bands, alignments, Routhian energies, configurations. Comparison with cranked shell-model calculations. Level-spacing systematics for negative- and positive-parity bands in ^{117,119,121,123,125,127,129}Ba.

doi: 10.1103/PhysRevC.95.024301
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2017DO01      Phys.Lett. B 766, 334 (2017)

D.T.Doherty, J.M.Allmond, R.V.F.Janssens, W.Korten, S.Zhu, M.Zielinska, D.C.Radford, A.D.Ayangeakaa, B.Bucher, J.C.Batchelder, C.W.Beausang, C.Campbell, M.P.Carpenter, D.Cline, H.L.Crawford, H.M.David, J.P.Delaroche, C.Dickerson, P.Fallon, A.Galindo-Uribarri, F.G.Kondev, J.L.Harker, A.B.Hayes, M.Hendricks, P.Humby, M.Girod, C.J.Gross, M.Klintefjord, K.Kolos, G.J.Lane, T.Lauritsen, J.Libert, A.O.Macchiavelli, P.J.Napiorkowski, E.Padilla-Rodal, R.C.Pardo, W.Reviol, D.G.Sarantites, G.Savard, D.Seweryniak, J.Srebrny, R.Varner, R.Vondrasek, A.Wiens, E.Wilson, J.L.Wood, C.Y.Wu

Triaxiality near the ¹¹⁰Ru ground state from Coulomb excitation

NUCLEAR REACTIONS ²⁰⁸Pb(¹¹⁰Ru, ¹¹⁰Ru'), E=430 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energy spectrum, B(E2) using GOSIA fit of the experimental data, level scheme, J, π, triaxial deformation. Comparison with available data.

doi: 10.1016/j.physletb.2017.01.031
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2017JO09      Phys.Lett. B 772, 703 (2017)

D.T.Joss, R.D.Page, A.Herzan, L.Donosa, J.Uusitalo, R.J.Carroll, I.G.Darby, K.Andgren, B.Cederwall, S.Eeckhaudt, T.Grahn, P.T.Greenlees, B.Hadinia, U.Jakobsson, P.M.Jones, R.Julin, S.Juutinen, M.Leino, A.-P.Leppanen, M.Nyman, D.O'Donnell, J.Pakarinen, P.Rahkila, M.Sandzelius, J.Saren, C.Scholey, D.Seweryniak, J.Simpson, J.Sorri

Spectroscopy at the two-proton drip line: Excited states in ¹⁵⁸W

NUCLEAR REACTIONS Pd(⁵⁸Ni, X)¹⁵⁸W, E=255 MeV; measured reaction products, Eγ, Iγ; deduced σ.

RADIOACTIVITY ¹⁵⁸W(α), (2p); measured decay products, Eα, Iα, Eγ, Iγ; deduced γ-ray energies, J, π, an upper limit for the two-proton decay branch and T_1/2. Comparison with available data.

doi: 10.1016/j.physletb.2017.07.031
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2017KA25      Phys.Lett. B 769, 549 (2017)

A.Kankainen, P.J.Woods, H.Schatz, T.Poxon-Pearson, D.T.Doherty, V.Bader, T.Baugher, D.Bazin, B.A.Brown, J.Browne, A.Estrade, A.Gade, J.Jose, A.Kontos, C.Langer, G.Lotay, Z.Meisel, F.Montes, S.Noji, F.Nunes, G.Perdikakis, J.Pereira, F.Recchia, T.Redpath, R.Stroberg, M.Scott, D.Seweryniak, J.Stevens, D.Weisshaar, K.Wimmer, R.Zegers

Measurement of key resonance states for the ³⁰P(p, γ)³¹S reaction rate, and the production of intermediate-mass elements in nova explosions

NUCLEAR REACTIONS ²H(³⁰P, n)³¹S, E=30 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies and relative intensities, σ, negative-parity states, spectroscopic factors, resonance parameters, astrophysical reaction rates. The GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array), the National Superconducting Cyclotron Laboratory, Michigan State University.

doi: 10.1016/j.physletb.2017.01.084
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2017LA09      Phys.Scr. 92, 074002 (2017)

T.Lauritsen, A.Korichi, T.L.Khoo, M.P.Carpenter, R.V.F.Janssens, L.A.Riley, D.Seweryniak, S.Zhu

Measuring the entry distribution and the quasi-continuum of γ rays with tracking arrays

doi: 10.1088/1402-4896/aa709c
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2017RU02      Acta Phys.Pol. B48, 351 (2017)

M.Rudigier, S.Lalkovski, E.R.Gamba, A.M.Bruce, Zs.Podolyak, P.H.Regan, M.Carpenter, S.Zhu, A.D.Ayangeakaa, J.T.Anderson, T.Berry, S.Bottoni, I.Burrows, R.Carroll, P.Copp, D.Cullen, T.Daniel, L.Fraile, M.Carmona-Gallardo, A.Grant, J.P.Greene, L.A.Guegi, D.Hartley, R.Ilieva, S.Ilieva, R.V.F.Janssens, F.G.Kondev, T.Kroll, G.J.Lane, T.Lauritsen, I.Lazarus, G.Lotay, G.Fernandez-Martinez, V.Pucknell, M.Reed, J.Rohrer, J.Sethi, D.Seweryniak, C.M.Shand, J.Simpson, M.Smolen, E.Stefanova, V.Vedia, O.Yordanov

Fast Timing Measurement Using an LaBr3(Ce) Scintillator Detector Array Coupled with Gammasphere

doi: 10.5506/APhysPolB.48.351
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2016AL18      Phys.Rev. C 94, 034301 (2016)

M.Albers, S.Zhu, A.D.Ayangeakaa, R.V.F.Janssens, J.Gellanki, I.Ragnarsson, M.Alcorta, T.Baugher, P.F.Bertone, M.P.Carpenter, C.J.Chiara, P.Chowdhury, H.M.David, A.N.Deacon, B.DiGiovine, A.Gade, C.R.Hoffman, F.G.Kondev, T.Lauritsen, C.J.Lister, E.A.McCutchan, C.Nair, A.M.Rogers, D.Seweryniak

Single-particle and collective excitations in ⁶²Ni

NUCLEAR REACTIONS ²⁶Mg(⁴⁸Ca, 4n2α)⁶²Ni, E=275, 320 MeV; measured reaction products identified by mass (A) and charge (Z), Eγ, Iγ, γ(θ), γγ-, (⁶²Ni)γ-coin, level half-lives and transition quadrupole moments using fragment mass analyzer (FMA) and Gammasphere array at ATLAS-ANL facility. ⁶²Ni; deduced high-spin levels, J, π, multipolarity, bands, deformation β₂, alignment plots, configurations. Comparison with shell-model calculations using JUN45 and jj4b interactions, and with Nilsson-Strutinsky calculations. Comparison of alignment plots with those in ⁵⁸Cr, ⁶⁰Fe, ⁶³Ni and ⁶⁴Zn.

doi: 10.1103/PhysRevC.94.034301
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2016AY01      Phys.Lett. B 754, 254 (2016)

A.D.Ayangeakaa, R.V.F.Janssens, C.Y.Wu, J.M.Allmond, J.L.Wood, S.Zhu, M.Albers, S.Almaraz-Calderon, B.Bucher, M.P.Carpenter, C.J.Chiara, D.Cline, H.L.Crawford, H.M.David, J.Harker, A.B.Hayes, C.R.Hoffman, B.P.Kay, K.Kolos, A.Korichi, T.Lauritsen, A.O.Macchiavelli, A.Richard, D.Seweryniak, A.Wiens

Shape coexistence and the role of axial asymmetry in ⁷²Ge

NUCLEAR REACTIONS ²⁰⁸Pb(⁷²Ge, ⁷²Ge'), E=301 MeV; measured reaction products, Eγ, Iγ. ⁷²Ge; deduced energy levels, J, π, reduced E2 matrix elements, B(E2) values. Comparison with available data.

doi: 10.1016/j.physletb.2016.01.036
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2016AY04      Phys.Rev. C 93, 054317 (2016)

A.D.Ayangeakaa, U.Garg, C.M.Petrache, S.Guo, P.W.Zhao, J.T.Matta, B.K.Nayak, D.Patel, R.V.F.Janssens, M.P.Carpenter, C.J.Chiara, F.G.Kondev, T.Lauritsen, D.Seweryniak, S.Zhu, S.S.Ghugre, R.Palit

In-beam spectroscopy of medium- and high-spin states in ¹³³Ce

NUCLEAR REACTIONS ¹¹⁶Cd(²²Ne, 5n), E=112 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), γγ(θ) using Gammasphere array at ATLAS-ANL facility, enriched target. ¹³³Ce; deduced high-spin levels, J, π, multipolarity, dipole and quadrupole bands, alignments, configurations, rich diversity of collective phenomena. Comparisons with calculations based on cranked Nilsson-Strutinsky (CNS) model and tilted axis cranking covariant density functional theory (TAC-CDFT).

doi: 10.1103/PhysRevC.93.054317
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2016BU02      Phys.Rev.Lett. 116, 112503 (2016)

B.Bucher, S.Zhu, C.Y.Wu, R.V.F.Janssens, D.Cline, A.B.Hayes, M.Albers, A.D.Ayangeakaa, P.A.Butler, C.M.Campbell, M.P.Carpenter, C.J.Chiara, J.A.Clark, H.L.Crawford, M.Cromaz, H.M.David, C.Dickerson, E.T.Gregor, J.Harker, C.R.Hoffman, B.P.Kay, F.G.Kondev, A.Korichi, T.Lauritsen, A.O.Macchiavelli, R.C.Pardo, A.Richard, M.A.Riley, G.Savard, M.Scheck, D.Seweryniak, M.K.Smith, R.Vondrasek, A.Wiens

Direct Evidence of Octupole Deformation in Neutron-Rich ¹⁴⁴Ba

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁴⁴Ba, ¹⁴⁴Ba'), E=650 MeV; measured reaction products, Eγ, Iγ. ¹⁴⁴Ba; deduced yields, E2 and E3 matrix elements, quadrupole moments, deformation parameters, B(E2), B(E3). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.116.112503
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2016CA15      Phys.Rev. C 93, 034307 (2016)

R.J.Carroll, R.D.Page, D.T.Joss, D.O'Donnell, J.Uusitalo, I.G.Darby, K.Andgren, K.Auranen, S.Bonig, B.Cederwall, M.Doncel, M.C.Drummond, S.Eeckhaudt, T.Grahn, C.Gray-Jones, P.T.Greenlees, B.Hadinia, A.Herzan, U.Jakobsson, P.M.Jones, R.Julin, S.Juutinen, J.Konki, T.Kroll, M.Leino, A.-P.Leppanen, C.McPeake, M.Nyman, J.Pakarinen, J.Partanen, P.Peura, P.Rahkila, J.Revill, P.Ruotsalainen, M.Sandzelius, J.Saren, B.Saygi, C.Scholey, D.Seweryniak, J.Simpson, J.Sorri, S.Stolze, M.J.Taylor, A.Thornthwaite

Excited states in the proton-unbound nuclide ¹⁵⁸Ta

RADIOACTIVITY ¹⁶⁶Ir, ¹⁶²Re, ¹⁵⁸Ta(α)[¹⁶⁶Ir from ⁹²Mo(⁷⁸Kr, X), E=380 MeV using RITU separator at Jyvaskyla; ¹⁶²Re and ¹⁵⁸Ta from α decay chain]; measured Eα, Eγ, αγ-coin, α(implanted ion) correlations. ¹⁵⁸Ta; deduced levels, J, π. ¹⁶⁷Ir, ^165,166Os(α); observed α spectrum.

NUCLEAR REACTIONS ¹⁰²Pd(⁵⁸Ni, np), E=255 MeV; measured Eγ, Iγ, Eα from g.s. and 19- isomer, γγ-coin, prompt and delayed γ rays, γ(implant) correlations using RITU separator, GREAT spectrometer and JUROGAM array at Jyvaskyla. ¹⁵⁸Ta; deduced high-spin levels, J, π, isomer, conversion coefficients, multipolarity, configurations. Systematics of levels in N=85 isotones relative to 7/2- in odd-A and 9+ and 10+ in even-A isotopes of ¹⁴⁹Gd, ¹⁵¹Dy, ¹⁵³Er, ¹⁵⁵Yb, ¹⁵⁷Hf, ¹⁵⁹W, ¹⁵⁰Tb, ¹⁵²Ho, ¹⁵⁴Tm, ¹⁵⁶Lu, ¹⁵⁸Ta, ¹⁶⁰Re. Discussed proton emission from excited states.

doi: 10.1103/PhysRevC.93.034307
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2016CA42      Phys.Rev. C 94, 064311 (2016)

R.J.Carroll, B.Hadinia, C.Qi, D.T.Joss, R.D.Page, J.Uusitalo, K.Andgren, B.Cederwall, I.G.Darby, S.Eeckhaudt, T.Grahn, C.Gray-Jones, P.T.Greenlees, P.M.Jones, R.Julin, S.Juutinen, M.Leino, A.-P.Leppanen, M.Nyman, J.Pakarinen, P.Rahkila, M.Sandzelius, J.Saren, C.Scholey, D.Seweryniak, J.Simpson

Multiparticle configurations of excited states in ¹⁵⁵Lu

NUCLEAR REACTIONS ¹⁰²Pd(⁵⁸Ni, pα)¹⁵⁵Lu/¹⁵⁶Lu/¹⁵⁷Lu/¹⁵⁶Hf/¹⁵⁷Hf/¹⁵⁷Ta/¹⁵⁸Ta/¹⁵⁹Ta/¹⁵⁸W, E=255 MeV; measured reaction products, Eγ, Iγ, delayed γ, (recoils)(α)γγ-coin using RITU separator, JUROGAM array and GREAT spectrometer at Jyvaskyla Accelerator Laboratory. Recoil-decay tagging (RDT) technique. ¹⁵⁵Lu; deduced levels, J, π, multipolarity, configurations, anti-aligned 1+ interaction between h_11/2 protons and h_9/2 neutrons. Comparison with shell-model calculations. Systematics of excited states in odd-A N=84 isotones of ¹⁴⁹Tb, ¹⁵¹Ho, ¹⁵³Tm, ¹⁵⁵Lu, ¹⁵⁷Ta.

doi: 10.1103/PhysRevC.94.064311
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2016HO13      Phys.Rev. C 94, 021303 (2016)

S.S.Hota, S.K.Tandel, P.Chowdhury, I.Ahmad, M.P.Carpenter, C.J.Chiara, J.P.Greene, C.R.Hoffman, E.G.Jackson, R.V.F.Janssens, B.P.Kay, T.L.Khoo, F.G.Kondev, S.Lakshmi, S.Lalkovski, T.Lauritsen, C.J.Lister, E.A.McCutchan, K.Moran, D.Peterson, U.Shirwadkar, D.Seweryniak, I.Stefanescu, Y.Toh, S.Zhu

Population and decay of a K^π = 8^- two-quasineutron isomer in ²⁴⁴Pu

NUCLEAR REACTIONS ²⁴⁴Pu(²⁰⁸Pb, ²⁰⁸Pb'), E=1430 MeV; ²⁴⁴Pu(⁴⁷Ti, ⁴⁷TI'), E=305 MeV; measured Eγ, Iγ, γγ-coin, M1/E2 branching ratios, prompt and off-beam γ rays, half-life of a 2-qp 8- isomer using Gammasphere array at ATLAS-ANL. ²⁴⁴Pu; deduced high-spin levels, J, π, rotational bands, multipolarity, configurations, kinematic and dynamic moments of inertia, (g_k-g_R)/Q₀, reduced hindrance factors for transitions from the isomer. Comparison with multi-qp calculations using Woods-Saxon potential and Lipkin-Nogami pairing. Systematics of moment of inertia plots and 8- isomers for ²⁴⁴Pu, ²⁵⁰Fm and ²⁵²No.

doi: 10.1103/PhysRevC.94.021303
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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. ^{115,117,119,121,123,125,127,129}Sn; measured yields of reaction products. ^{119,121,123,125}Sn; 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 ^{117,119,121,123,125,127,129}Sn. 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 ^{119,121,123,125,127,129}Sn; calculated levels, J, π using shell model with jj55pn interaction. Comparison with experimental spectra.

doi: 10.1103/PhysRevC.93.014303
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2016KA05      Eur.Phys.J. A 52, 6 (2016)

A.Kankainen, P.J.Woods, F.Nunes, C.Langer, H.Schatz, V.Bader, T.Baugher, D.Bazin, B.A.Brown, J.Browne, D.T.Doherty, A.Estrade, A.Gade, A.Kontos, G.Lotay, Z.Meisel, F.Montes, S.Noji, G.Perdikakis, J.Pereira, F.Recchia, T.Redpath, R.Stroberg, M.Scott, D.Seweryniak, J.Stevens, D.Weisshaar, K.Wimmer, R.Zegers

Angle-integrated measurements of the ²⁶Al (d, n) ²⁷Si reaction cross section: a probe of spectroscopic factors and astrophysical resonance strengths

NUCLEAR REACTIONS ²H(²⁶Al, n), E=30 MeV/nucleon; measured 511 keV γ-ray using GRETINA (Gamma-Ray Energy Tracking In-beam Nuclear Array), Si recoils, (Si)γ-coin; deduced Doppler-reconstructed γ-ray spectrum in coincidence with Si, σ, resonances, spectroscopic factors to discrete states; calculated σ using shell model.

doi: 10.1140/epja/i2016-16006-5
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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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2016MU06      Phys.Rev. C 93, 065803 (2016)

M.Munch, M.Alcorta, H.O.U.Fynbo, M.Albers, S.Almaraz-Calderon, M.L.Avila, A.D.Ayangeakaa, B.B.Back, P.F.Bertone, P.F.F.Carnelli, M.P.Carpenter, C.J.Chiara, J.A.Clark, B.DiGiovine, J.P.Greene, J.L.Harker, C.R.Hoffman, N.J.Hubbard, C.L.Jiang, O.S.Kirsebom, T.Lauritsen, K.L.Laursen, S.T.Marley, C.Nair, O.Nusair, D.Santiago-Gonzalez, J.Sethi, D.Seweryniak, R.Talwar, C.Ugalde, S.Zhu

Independent measurement of the Hoyle state β feeding from ¹²B using Gammasphere

RADIOACTIVITY ¹²B(β^-)[from ²H(¹¹B, p), E=40 MeV from ATLAS-ANL facility]; measured Eγ, Iγ, γγ-coin, γγ(θ) for the Hoyle state using Gammasphere array. ¹²C; deduced first excited 2+ and 0+ levels, β branching ratio to the Hoyle state in ¹²C, logft, indication of higher clustering for the Hoyle state as compared to previous results. Comparison with theoretical calculations using antisymmetrized molecular dynamics (AMD), and with previous experimental results.

doi: 10.1103/PhysRevC.93.065803
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2016PE09      Phys.Rev. C 93, 064305 (2016)

C.M.Petrache, S.Guo, A.D.Ayangeakaa, U.Garg, J.T.Matta, B.K.Nayak, D.Patel, M.P.Carpenter, C.J.Chiara, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, D.Seweryniak, S.Zhu, S.S.Ghugre, R.Palit

Triaxiality and exotic rotations at high spins in ¹³⁴Ce

NUCLEAR REACTIONS ¹¹⁶Cd(²²Ne, 4n), E=112 MeV; Measured Eγ, Iγ, γγ-coin, γ(θ), γγ(θ) using Gammasphere array at ATLAS-ANL facility. ¹³⁴Ce; deduced high-spin levels, J, π, multipolarity, SD and triaxial bands, triaxiality, alignments, configurations. Comparison with cranked Nilsson-Strutinsky (CNS) calculations.

doi: 10.1103/PhysRevC.93.064305
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2016PE21      Phys.Rev. C 94, 064309 (2016)

C.M.Petrache, Q.B.Chen, S.Guo, A.D.Ayangeakaa, U.Garg, J.T.Matta, B.K.Nayak, D.Patel, J.Meng, M.P.Carpenter, C.J.Chiara, R.V.F.Janssens, F.G.Kondev, T.Lauritsen, D.Seweryniak, S.Zhu, S.S.Ghugre, R.Palit

Triaxial-band structures, chirality, and magnetic rotation in ¹³³La

NUCLEAR REACTIONS ¹¹⁶Cd(²²Ne, 4np), E=112 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), γγ(θ) ratios using Gammasphere array at ATLAS-ANL facility. ¹³³La; deduced high-spin levels, J, π, multipolarities, bands, alignments, B(M1)/B(E2) ratios, configurations. Comparison with calculations using cranked Nilsson-Strutinsky (CNS) model, covariant density functional theory (CDFT) with a self-consistent relativistic mean field (RMF), and the particle rotor model (PRM).

doi: 10.1103/PhysRevC.94.064309
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2016RE02      Phys.Lett. B 752, 311 (2016)

M.W.Reed, G.J.Lane, G.D.Dracoulis, F.G.Kondev, M.P.Carpenter, P.Chowdhury, S.S.Hota, R.O.Hughes, R.V.F.Janssens, T.Lauritsen, C.J.Lister, N.Palalani, D.Seweryniak, H.Watanabe, S.Zhu, W.G.Jiang, F.R.Xu

Impact of triaxiality on the rotational structure of neutron-rich rhenium isotopes

NUCLEAR REACTIONS ¹⁹²Os(¹³⁶Xe, X)¹⁸⁷Re, ¹⁸⁷Re(¹³⁶Xe, X)¹⁸⁹Re, ¹⁸⁶W(¹³⁶Xe, X)¹⁹¹Re, E=6 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced level scheme, γ-ray energies, J, π, rotational bands, triaxiality. Comparison with particle-triaxial-rotor calculations.

doi: 10.1016/j.physletb.2015.11.056
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2016TA23      Phys.Rev. C 94, 064304 (2016)

S.K.Tandel, P.Chowdhury, F.G.Kondev, R.V.F.Janssens, T.L.Khoo, M.P.Carpenter, T.Lauritsen, C.J.Lister, D.Seweryniak, S.Zhu, A.Deacon, S.J.Freeman, N.J.Hammond, G.D.Jones, E.F.Moore, J.F.Smith

Configurations and decay hindrances of high-K states in ¹⁸⁰Hf

NUCLEAR REACTIONS ¹⁸⁰Hf(²⁰⁷Pb, X), E=1.4 GeV; measured Eγ, Iγ, γγ-coin, delayed γ, level and isomer half-lives by γγ(t) and centroid-shift method using Gammasphere array and heavy-ion detector CHICO at ATLAS-ANL facility. ¹⁸⁰Hf; deduced high-spin levels, J, π, 2- and 4-qp states, multi-quasiparticle high-K states, rotational bands, reduced hindrances for E1, E2, E3, M1 and M2 transitions from isomers, (g_K-g_R)/Q₀ as function of Jπ, configurations. Comparison with theoretical calculations using Lipkin-Nogami approach for pairing, with blocking included. Systematics of high-K states in ¹⁸⁰Hf, ^180,182W, and ^182,184Os.

doi: 10.1103/PhysRevC.94.064304
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2015AY02      Phys.Rev. C 91, 044327 (2015)

A.D.Ayangeakaa, S.Zhu, R.V.F.Janssens, M.P.Carpenter, M.Albers, M.Alcorta, T.Baugher, P.F.Bertone, C.J.Chiara, P.Chowdhury, H.M.David, A.N.Deacon, B.DiGiovine, A.Gade, C.R.Hoffman, F.G.Kondev, T.Lauritsen, C.J.Lister, E.A.McCutchan, D.S.Moerland, C.Nair, A.M.Rogers, D.Seweryniak

Role of the νg_9/2 orbital in the development of collectivity in the A≈60 region: The case of ⁶¹Co

NUCLEAR REACTIONS ²⁶Mg(⁴⁸Ca, 4np2α)⁶¹Co, E=275, 290, 320 MeV; measured Eγ, Iγ, γγ-coin, γ(θ), centroid-shift Doppler-attenuation using FMA analyzer and GAMMASPHERE array at ATLAS-ANL facility. ⁶¹Co; deduced levels, J, π, multipolarity, bands, magnetic rotational dipole (shears) band, transition quadrupole moment and deformation parameter from DSA data, Nilsson configurations. Comparison with shell-model calculations using GXPF1A effective interaction in a modest-size pf space, and with structures of N=34 isotones ⁶⁰Fe and ⁶²Ni.

doi: 10.1103/PhysRevC.91.044327
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