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NSR database version of April 11, 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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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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2023CR03      Nucl.Instrum.Methods Phys.Res. A1055, 168525 (2023)

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

New method for level-lifetime measurements with thick scintillators

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

doi: 10.1016/j.nima.2023.168525
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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 T1/2, 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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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 T1/2, 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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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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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 T1/2. 36Al; deduced levels, J, π, newly-observed β-decaying isomer, T1/2 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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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 Kα and Kβ 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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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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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, T1/2 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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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, T1/2 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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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 T1/2. 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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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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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

νi13/2 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, νi13/2 bands, with the two signature partners, alignments and signature splitting. Discussed systematics of νi13/2 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, T1/2 using double-sided silicon strip detector (DSSD), and four HPGe clover detectors. 183,183mHg; deduced levels, isomer, J, π, T1/2 of g.s. and isomer, α branching ratio, K-conversion coefficient, multipolarity, B(M2), Nilsson configurations. 187mPb; deduced T1/2. Systematics of decay schemes of 13/2+ isomers in 175,177,179,181,183,185Hg. 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, 109,111,113,115Sn, 153Yb, 161Hf, 163W, 163Os, 171,189,191Pt, 181,183,201,203,205Hg, 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 T1/2, 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, T1/2 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 T1/2 of isomers of >1 micro-sec half-life above 7-MeV excitations across the nuclear chart. 202,203,204,205Tl, 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, T1/2 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,188Pb, 189,189mBi; deduced recoil-decay tagging (RDT) γ-ray yields. 188Bi; deduced levels, J, π, isomer, T1/2 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,188Pb, 188,189,189mBi; observed Eα. Systematics of 9/2-, 1/2+, 7/2- and 13/2+ level energies in 185,187,189,191,193,195Bi, and those of first 2+, 4+, 6+ and 8+, second 0+, 2+ and 4+ in 188,190,192,194,196,198,200,202,204,206,208,210Po.

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, Γp, Γγ, 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, T1/2, 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, 161Gd

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 Tz = -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 178,180,182,184,186,188W, 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 192,194,196,198,200,202,204Hg.

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, Γp, Γγ, 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, T1/2, 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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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, 202Pb

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, 248Cm 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 T1/2. 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, T1/2. 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, T1/2, 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 T1/2, 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, 162Eu 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, T1/2.

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 90,92,94,96,98,100,102,104,106Zr.

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, Γγ and Γp 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 117,119,121,123,125,127,129Ba.

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 T1/2. 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 h11/2 protons and h9/2 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 Kπ = 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, (gk-gR)/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. 115,117,119,121,123,125,127,129Sn; measured yields of reaction products. 119,121,123,125Sn; deduced high-spin levels, J, π, multipolarity, high-seniority states, isomers, B(E1), B(E2), B(M2), B(E3). Comparison with shell model calculations with jj55pn interactions. Systematics of yrast levels and B(Eλ) values for 117,119,121,123,125,127,129Sn. Systematics of B(E2) values for 10+ to 8+ and 19/2+ to 15/2+ isomeric transitions in A=116-130 Sn isotopes.

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

doi: 10.1103/PhysRevC.93.014303
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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, (gK-gR)/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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Data from this article have been entered in the XUNDL database. For more information, click here.


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 νg9/2 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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Data from this article have been entered in the XUNDL database. For more information, click here.


2015CA04      Acta Phys.Pol. B46, 695 (2015)

R.J.Carroll, R.D.Page, D.T.Joss, J.Uusitalo, I.G.Darby, K.Andgren, B.Cederwall, S.Eeckhaudt, T.Grahn, C.Gray-Jones, P.T.Greenlees, B.Hadinia, 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

Competing Decay Modes of a High-spin Isomer in the Proton-unbound Nucleus 158Ta

RADIOACTIVITY 158Ta(α), 154Lu(β+), 154Yb(α) [from 102Pd(58Ni, X)158Ta, E=255 MeV]; measured decay products, Eγ, Iγ; deduced energy levels, isomeric states, J, π, T1/2. Comparison with available data.

doi: 10.5506/APhysPolB.46.695
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