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NSR database version of April 11, 2024.

Search: Author = P.M.Walker

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2024KA12      Phys.Rev. C 109, 034320 (2024)

A.Kardan, P.M.Walker, I.Ragnarsson

Isomeric states in neutron-rich Z=76 isotopes and N=116 isotones

doi: 10.1103/PhysRevC.109.034320
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2023BR09      Eur.Phys.J. A 59, 199 (2023)

F.Browne, A.M.Bruce, T.Sumikama, I.Nishizuka, S.Nishimura, P.Doornenbal, J.G.Li, G.Lorusso, P.-A.Soderstrom, P.M.Walker, H.Watanabe, F.R.Xu, R.Daido, Z.Patel, S.Rice, L.Sinclair, J.Wu, Z.Y.Xu, A.Yagi, H.Baba, N.Chiga, R.Carroll, F.Didierjean, Y.Fang, N.Fukuda, G.Gey, E.Ideguchi, N.Inabe, T.Isobe, D.Kameda, I.Kojouharov, N.Kurz, T.Kubo, S.Lalkovski, Z.Li, R.Lozeva, N.Nishibata, A.Odahara, Zs.Podolyak, P.H.Regan, O.J.Roberts, H.Sakurai, H.Schaffner, G.S.Simpson, H.Suzuki, H.Takeda, M.Tanaka, J.Taprogge, V.Werner, O.Wieland

Interpretation of metastable states in the N > 70 Zr region

RADIOACTIVITY 111Zr, 112,113Nb, 115Mo, 108,109Nb, 113Tc, 117,119Ru, 120,122Rh(IT) [from 9Be(238U, X), E=345 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies, T1/2, decay schemes. Comparison with calculations. The Radioactive Isotope Beam Factory, operated by the RIKEN Nishina Center and the Center for Nuclear Study, University of Tokyo.

doi: 10.1140/epja/s10050-023-01103-7
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2022LI20      Phys.Rev.Lett. 128, 152701 (2022)

H.F.Li, S.Naimi, T.M.Sprouse, M.R.Mumpower, Y.Abe, Y.Yamaguchi, D.Nagae, F.Suzaki, M.Wakasugi, H.Arakawa, W.B.Dou, D.Hamakawa, S.Hosoi, Y.Inada, D.Kajiki, T.Kobayashi, M.Sakaue, Y.Yokoda, T.Yamaguchi, R.Kagesawa, D.Kamioka, T.Moriguchi, M.Mukai, A.Ozawa, S.Ota, N.Kitamura, S.Masuoka, S.Michimasa, H.Baba, N.Fukuda, Y.Shimizu, H.Suzuki, H.Takeda, D.S.Ahn, M.Wang, C.Y.Fu, Q.Wang, S.Suzuki, Z.Ge, Y.A.Litvinov, G.Lorusso, P.M.Walker, Z.Podolyak, T.Uesaka

First Application of Mass Measurements with the Rare-RI Ring Reveals the Solar r-Process Abundance Trend at A=122 and A=123

ATOMIC MASSES 123Pd, 125Cd, 126In; measured frequencies; deduced mass excess values with low uncertainties. Comparison with calculations. Radioactive Isotope Beam Factory (RIBF) in RIKEN.

doi: 10.1103/PhysRevLett.128.152701
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2022MU10      Phys.Rev. C 105, 034331 (2022)

M.Mukai, Y.Hirayama, Y.X.Watanabe, H.Watanabe, H.Koura, S.C.Jeong, H.Miyatake, M.Brunet, S.Ishizawa, F.G.Kondev, G.J.Lane, Yu.A.Litvinov, T.Niwase, M.Oyaizu, Zs.Podolyak, M.Rosenbusch, P.Schury, M.Wada, P.M.Walker

Ground-state β-decay spectroscopy of 187Ta

RADIOACTIVITY 187Ta(β-)[from W(136Xe, X), E=7.2 MeV/nucleon]; measured Eγ, Iγ, βγ-coin; deduced Iβ feedings, T1/2, logft, Iγ/β-decay. 187W; deduced Eγ, multipolarities, total conversion coefficients (BrIcc calculations). Comparison to KTUY+gross theory, FRDM+QRPA and RHB+pn-RQRPAKEK calculations. Isotope Separation System (KISS) at RIKEN, an argon-gas-cell-based laser ion source combined with an on-line isotope separator.

doi: 10.1103/PhysRevC.105.034331
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2022ZA05      Phys.Lett. B 834, 137457 (2022)

L.Zago, A.Gottardo, J.J.Valiente-Dobon, G.Benzoni, A.Gadea, M.Gorska, S.Lunardi, Zs.Podolyak, P.H.Regan, D.Rudolph, A.Algora, G.de Angelis, D.Bazzacco, J.Benlliure, P.Boutachkov, A.Bracco, A.M.Bruce, F.Camera, E.Casarejos, M.L.Cortes, F.C.L.Crespi, A.Corsi, C.Domingo-Pardo, M.Doncel, T.Engert, H.Geissel, J.Gerl, A.Goasduff, N.Goel, J.Grebosz, E.Gregor, T.Habermann, S.Klupp, I.Kojouharov, N.Kurz, S.M.Lenzi, S.Leoni, S.Mandal, R.Menegazzo, D.Mengoni, B.Million, A.I.Morales, D.R.Napoli, F.Naqvi, C.Nociforo, M.Pfutzner, S.Pietri, A.Prochazka, F.Recchia, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, P.Strmen, I.Szarka, C.A.Ur, P.M.Walker, H.Weick, O.Wieland, H.-J.Wollersheim

High-spin states in 212Po above the α-decaying (18+) isomer

NUCLEAR REACTIONS 9Be(238U, X), E=1 GeV/nucleon; measured reaction products, isotope identification matrix, Eγ, Iγ, T1/2 of isomers by γ(t) using RISING array of 105 Ge detectors and the FRS separator at the GSI UNILAC-SIS18 facility. 212Po; deduced high-spin levels, J, π, T1/2 of two micro-sec isomers, multipolarity, configuration, transition probabilities. 204mTl, 205m,206mPb, 207Bi, 210m,211mPo; compiled measured isomer ratios from literature, and compared with theoretical predictions from the sharp cut-off model. Comparison with shell-model calculations.

doi: 10.1016/j.physletb.2022.137457
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2021VA03      Phys.Lett. B 816, 136183 (2021)

J.J.Valiente-Dobon, A.Gottardo, G.Benzoni, A.Gadea, S.Lunardi, A.Algora, G.de Angelis, D.Bazzacco, J.Benlliure, P.Boutachkov, A.Bracco, A.M.Bruce, F.Camera, E.Casarejos, M.L.Cortes, F.C.L.Crespi, A.Corsi, C.Domingo-Pardo, M.Doncel, T.Engert, H.Geissel, J.Gerl, A.Goasduff, N.Goel, M.Gorska, J.Grebosz, E.Gregor, T.Habermann, S.Klupp, I.Kojouharov, N.Kurz, S.M.Lenzi, S.Leoni, S.Mandal, R.Menegazzo, D.Mengoni, B.Million, A.I.Morales, D.R.Napoli, F.Naqvi, C.Nociforo, M.Pfutzner, S.Pietri, Zs.Podolyak, A.Prochazka, F.Recchia, P.H.Regan, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, P.Strmen, I.Szarka, C.A.Ur, P.M.Walker, H.Weick, O.Wieland, H.-J.Wollersheim, P.Van Isacker

Manifestation of the Berry phase in the atomic nucleus 213Pb

RADIOACTIVITY 213Pb(IT) [from 9Be(238U, X)213Pb, E=1 GeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, T1/2, isomer decays with asymmetric E2 transition probabilities, Berry phase.

doi: 10.1016/j.physletb.2021.136183
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2021WA15      Phys.Lett. B 814, 136088 (2021)

H.Watanabe, Y.X.Watanabe, Y.Hirayama, A.N.Andreyev, T.Hashimoto, F.G.Kondev, G.J.Lane, Yu.A.Litvinov, J.J.Liu, H.Miyatake, J.Y.Moon, A.I.Morales, M.Mukai, S.Nishimura, T.Niwase, M.Rosenbusch, P.Schury, Y.Shi, M.Wada, P.M.Walker

Beta decay of the axially asymmetric ground state of 192Re

RADIOACTIVITY 192Re(β-) [from Pt(136Xe, X)192Re, E=10.75 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, level scheme, J, π. Comparison with single-particle structure using the nuclear Skyrme-Hartree-Fock model. KEK Isotope Separation System (KISS) in RIKEN Nishina Center.

doi: 10.1016/j.physletb.2021.136088
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2021WA31      Phys.Rev. C 103, 064305 (2021)

P.M.Walker, P.D.Stevenson

Configuration mixing and K-forbidden E2 decays

NUCLEAR STRUCTURE 171mTm, 175mLu, 171m,175mHf, 173m,175m,177m,179m,181m,185mTa, 179m,181m,183mW, 191mRe, 181mOs; analyzed reduced Weisskopf hindrance factors and two-level mixing strengths for K-forbidden E2 transitions from three-quasiparticle isomers; deduced significant configuration dependence.

doi: 10.1103/PhysRevC.103.064305
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2021WA39      Phys.Rev. C 104, 024330 (2021)

Y.X.Watanabe, P.M.Walker, Y.Hirayama, M.Mukai, H.Watanabe, G.J.Lane, M.Ahmed, M.Brunet, T.Hashimoto, S.Ishizawa, S.Kimura, F.G.Kondev, Yu.A.Litvinov, H.Miyatake, J.Y.Moon, T.Niwase, M.Oyaizu, J.H.Park, Zs.Podolyak, M.Rosenbusch, P.Schury, M.Wada

First direct observation of isomeric decay in neutron-rich odd-odd 186Ta

RADIOACTIVITY 186Ta(β-), 186mTa(IT)[from W(136Xe, X), E=7.2 MeV/nucleon, followed by laser ionization and mass separation at the KEK Isotope Separation System (KISS) of RIBF-RIKEN facility]; measured Eγ, Iγ, (particle)γ-coin, half-lives of decays of 186Ta and neutral 186mTa from γ-decay curves. 186Ta; deduced levels, J, π, E3 multipolarity of the 161-keV isomeric transition from a comparison of measured half-life of the neutral isomer with previous measurements of the ionized isomeric state of 186Ta using the Experimental Storage Ring at GSI Darmstadt, no evidence found for the β decay mode of the 186Ta isomer.

doi: 10.1103/PhysRevC.104.024330
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2020AM04      Phys.Rev. C 102, 034319 (2020)

F.Amirzadeh, A.Kardan, P.M.Walker, H.-L.Ma

Isomeric and collective structures in neutron-rich hafnium isotopes

NUCLEAR STRUCTURE 178Hf; calculated CNSB potential-energy surfaces in (ϵ2, γ) plane for g.s., 6+, and two 8-, 14- and 16+ isomers, single-particle energies, level energies, g factors, pairing energies and isomeric state configurations. 178,180,182,184,186Hf; calculated levels, J, π, energies of isomeric states, deformation parameters, configurations of multi-quasiparticle states, energies of the prolate collective, prolate noncollective, and the oblate collective states. 180Hf; calculated CNSB potential-energy surfaces in (ϵ2, γ) plane for states of spins 0, 14, 28, and 36. Paired cranked Nilsson-Strutinsky-Bogoliubov (CNSB), and the unpaired cranked Nilsson-Strutinsky (CNS) formalisms. Comparison with experimental data, and with predictions of total Routhian surface (TRS) model. Discussed high-spin shape coexistence.

doi: 10.1103/PhysRevC.102.034319
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2020BE10      Phys.Rev. C 101, 054311 (2020)

T.A.Berry, Zs.Podolyak, R.J.Carroll, R.Lica, B.A.Brown, H.Grawe, Ch.Sotty, N.K.Timofeyuk, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, M.Brunet, J.R.Cresswell, C.Fahlander, L.M.Fraile, H.O.U.Fynbo, E.Gambna, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, M.Kowalska, J.Kurcewicz, I.Kuti, S.Lalkovski, I.Lazarus, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, A.Negret, S.Nae, C.Nita, S.Pascu, R.D.Page, Z.Patel, A.Perea, J.Phrompao, M.Piersa, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, M.Rudigier, C.M.Shand, R.Shearman, E.C.Simpson, S.Stegemann, T.Stora, O.Tengblad, A.Turturica, P.Van Duppen, V.Vedia, P.M.Walker, N.Warr, F.P.Wearing, H.De Witte

Octupole states in 207Tl studied through β decay

RADIOACTIVITY 207Hg(β-)[from 208Pb(p, X)207Hg, E=1.4 GeV]; measured Eγ, Iγ, βγ- and βγγ-coin, γγ(θ) using plastic scintillators for β-detection and four HPGe detectors for γ-detection at CERN-ISOLDE. 207Tl; deduced levels J, π, β feedings, multipolarities, logft, B(M1), B(E1), B(E2), B(M2), B(E3), configurations. Discussion of octupole phonon states. Comparison with state-of-the-art large-scale shell-model calculations, and with previous experimental results.

doi: 10.1103/PhysRevC.101.054311
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2020CA11      Phys.Rev. C 101, 054314 (2020)

R.J.Carroll, P.M.Walker, G.J.Lane, M.W.Reed, A.Akber, H.M.Albers, J.J.Carroll, D.M.Cullen, A.C.Dai, C.Fahlander, M.S.M.Gerathy, S.S.Hota, G.Lotay, T.Kibedi, V.Margerin, A.J.Mitchell, N.Palalani, T.Palazzo, Z.Patel, R.Shearman, A.E.Stuchbery, F.R.Xu

γ-ray spectroscopy of a four-quasiparticle isomer band in 174Re

NUCLEAR REACTIONS 160Dy(19F, 5n), E=107 MeV pulsed beam from the 14-UD Pelletron at the Australian National University]; measured prompt and delayed Eγ, Iγ, γγ-coin, half-lives of isomers by γ(t) and γγ(t) using the CAESAR HPGe detector array. 174Re; deduced levels, J, π, bands, γ-branching ratios, four-quasiparticle Kπ=(14-) isomer, Nilsson configurations, gK, Weisskopf hindrances and reduced hindrances for transitions from the (14-) isomer and the (8-) bandhead; calculated potential energy surfaces. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.101.054314
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2020CA25      Phys.Rev.Lett. 125, 192501 (2020)

R.J.Carroll, Z.Podolyak, T.Berry, H.Grawe, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, M.Brunet, J.R.Creswell, L.M.Fraile, C.Fahlander, H.O.U.Fynbo, E.R.Gamba, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.T.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, J.Kurcewicz, I.Kuti, S.Lalkovski, I.H.Lazarus, R.Lica, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, A.Negret, C.Nita, S.Pascu, R.D.Page, Z.Patel, A.Perea, J.Phrompao, M.Piersa, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, M.Rudigier, C.M.Shand, R.Shearman, S.Stegemann, T.Stora, C.Sotty, O.Tengblad, P.Van Duppen, V.Vedia, R.Wadsworth, P.M.Walker, N.Warr, F.Wearing, H.De Witte

Competition between Allowed and First-Forbidden β Decay: The Case of 208Hg → 208Tl

RADIOACTIVITY 208Hg(β-) [from Pb(p, X), E=1.4 GeV]; measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π, branching ratios, B(Eλ). Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.192501
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2020LI15      Phys.Rev.Lett. 124, 222501 (2020)

C.Lizarazo, P.-A.Soderstrom, V.Werner, N.Pietralla, P.M.Walker, G.X.Dong, F.R.Xu, T.R.Rodriguez, F.Browne, P.Doornenbal, S.Nishimura, CC.Nija, A.Obertelli, T.Ando, T.Arici, G.Authelet, H.Baba, A.Blazhev, A.M.Bruce, D.Calvet, R.J.Caroll, F.Chateau, S.Chen, L.X.Chung, A.Corsi, M.L.Cortes, A.Delbart, M.Dewald, B.Ding, F.Flavigny, S.Franchoo, J.Gerl, J.-M.Gheller, A.Giganon, A.Gillibert, M.Gorska, A.Gottardo, I.Kojouharov, N.Kurz, V.Lapoux, J.Lee, M.Lettmann, B.D.Linh, J.J.Liu, Z.Liu, S.Momiyama, K.Moschner, T.Motobayashi, S.Nagamine, N.Nakatsuka, M.Niikura, C.Nobs, L.Olivier, Z.Patel, N.Paul, Zs.Podolyak, J.-Y.Rousse, M.Rudigier, T.Y.Saito, H.Sakurai, C.Santamaria, H.Schaffner, C.Shand, I.Stefan, D.Steppenbeck, R.Taniuchi, T.Uesaka, V.Vaquero, K.Wimmer, Z.Xu

Metastable States of 92, 94Se: Identification of an Oblate K Isomer of 94Se and the Ground-State Shape Transition between N = 58 and 60

NUCLEAR REACTIONS 9Be(238U, X)92Se/94Se, 1H(92Se, 92Se'), (94Se, 94Se'), E<345 MeV/nucleon; measured reaction products. 92,94Se; deduced γ-ray energies, J, π, isomeric state T1/2. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.124.222501
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2020LI28      Phys.Rev. C 102, 024301 (2020)

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

Isomeric and β-decay spectroscopy of 173, 174Ho

RADIOACTIVITY 173,174Ho(β-)[from 9Be(238U, F), E=345 MeV/nucleon, followed by separation of fission fragments using BigRIPS separator and ZeroDegree spectrometer and implantation in WAS3ABi at RIBF-RIKEN facility]; measured Eγ, Iγ, Eβ, conversion electrons, βγ-, (ce)γ- and γγ-coin, half-lives of 173Ho and 174Ho decays from γ-decay curves, half-life of an isomer in 173Ho using double-sided silicon strip detectors (DSSD) and the EURICA γ-ray spectrometer. 174Er; deduced levels, J, π, β feedings, logft, configurations. 173Ho; deduced level, isomer, J, π. 174Ho; deduced J, π and configuration of ground state. 173,174Ho, 173,174Er; calculated levels, J, π, deformation parameters β2, γ and β4, configurations using configuration-constrained potential energy surface (PES) calculations. Systematics of yrast g.s. bands in N=106 isotones: 172Dy, 174Er, 176Yb, 178Hf, 180W, 182Os. Systematics of experimental logft values in decays of 168Ho, 171,173Er, 174,176Tm, 178Lu. Systematics of Weisskopf hindrance factors in odd-A Ho isotopes: 159,161,163,165,167Ho.

doi: 10.1103/PhysRevC.102.024301
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2020RU01      Phys.Lett. B 801, 135140 (2020)

M.Rudigier, P.M.Walker, R.L.Canavan, Zs.Podolyak, P.H.Regan, P.-A.Soderstrom, M.Lebois, J.N.Wilson, N.Jovancevic, A.Blazhev, J.Benito, S.Bottoni, M.Brunet, N.Cieplicka-Orynczak, S.Courtin, D.T.Doherty, L.M.Fraile, K.Hadynska-Klek, M.Heine, L.W.Iskra, J.Jolie, V.Karayonchev, A.Kennington, P.Koseoglou, G.Lotay, G.Lorusso, M.Nakhostin, C.R.Nita, S.Oberstedt, L.Qi, J.-M.Regis, V.Sanchez-Tembleque, R.Shearman, W.Witt, V.Vedia, K.O.Zell

Multi-quasiparticle sub-nanosecond isomers in 178W

NUCLEAR REACTIONS 164Dy(18O, 4n), E71, 76, 80 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, isomeric T1/2. Fast-timing techniques.

doi: 10.1016/j.physletb.2019.135140
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2020WA29      Phys.Rev.Lett. 125, 192505 (2020)

P.M.Walker, Y.Hirayama, G.J.Lane, H.Watanabe, G.D.Dracoulis, M.Ahmed, M.Brunet, T.Hashimoto, S.Ishizawa, F.G.Kondev, Y.A.Litvinov, H.Miyatake, J.Y.Moon, M.Mukai, T.Niwase, J.H.Park, Z.Podolyak, M.Rosenbusch, P.Schury, M.Wada, X.Y.Watanabe, W.Y.Liang, F.R.Xu

Properties of 187Ta Revealed through Isomeric Decay

RADIOACTIVITY 187Ta(IT) [from W(136Xe, X), E=7.2 MeV/nucleon]; measured decay products, Eγ, Iγ, Eβ, Iβ, γ-γ-, β-γ-coin.; deduced level energies, J, π, T1/2. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.192505
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2019BE37      Phys.Lett. B 793, 271 (2019)

T.A.Berry, Zs.Podolyak, R.J.Carroll, R.Lica, H.Grawe, N.K.Timofeyuk, T.Alexander, A.N.Andreyev, S.Ansari, M.J.G.Borge, J.Creswell, C.Fahlander, L.M.Fraile, H.O.U.Fynbo, W.Gelletly, R.-B.Gerst, M.Gorska, A.Gredley, P.Greenlees, L.J.Harkness-Brennan, M.Huyse, S.M.Judge, D.S.Judson, J.Konki, J.Kurcewicz, I.Kuti, S.Lalkovski, I.Lazarus, M.Lund, M.Madurga, N.Marginean, R.Marginean, I.Marroquin, C.Mihai, R.E.Mihai, E.Nacher, S.Nae, A.Negret, C.Nita, R.D.Page, S.Pascu, Z.Patel, A.Perea, V.Pucknell, P.Rahkila, E.Rapisarda, P.H.Regan, F.Rotaru, C.M.Shand, E.C.Simpson, Ch.Sotty, S.Stegemann, T.Stora, O.Tengblad, A.Turturica, P.Van Duppen, V.Vedia, R.Wadsworth, P.M.Walker, N.Warr, F.Wearing, H.De Witte

Investigation of the Λ n=0 selection rule in Gamow-Teller transitions: The β-decay of 207Hg

RADIOACTIVITY 207Hg(β-) [from Pb(p, X)207Hg, E=1.4 GeV]; measured decay products, Eβ, Iβ, Eγ, Iγ, γ-γ-coin.; deduced γ-ray energies and intensities, B(Eλ), branching ratios, partial level scheme, J, π, log ft limit, spectroscopic factors.

doi: 10.1016/j.physletb.2019.04.039
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2019GO10      Phys.Rev. C 99, 054326 (2019)

A.Gottardo, J.J.Valiente-Dobon, G.Benzoni, A.I.Morales, A.Gadea, S.Lunardi, P.Boutachkov, A.M.Bruce, M.Gorska, J.Grebosz, S.Pietri, Zs.Podolyak, M.Pfutzner, P.H.Regan, D.Rudolph, H.Weick, J.Alcantara Nunez, A.Algora, N.Al-Dahan, G.de Angelis, Y.Ayyad, N.Alkhomashi, P.R.P.Allegro, D.Bazzacco, J.Benlliure, M.Bowry, A.Bracco, M.Bunce, F.Camera, E.Casarejos, M.L.Cortes, F.C.L.Crespi, A.Corsi, A.M.D.Bacelar, A.Y.Deo, C.Domingo-Pardo, M.Doncel, Zs.Dombradi, T.Engert, K.Eppinger, G.F.Farrelly, F.Farinon, H.Geissel, J.Gerl, N.Goel, E.Gregor, T.Habermann, R.Hoischen, R.Janik, S.Klupp, I.Kojouharov, N.Kurz, S.M.Lenzi, S.Leoni, S.Mandal, R.Menegazzo, D.Mengoni, B.Million, D.R.Napoli, F.Naqvi, C.Nociforo, A.Prochazka, W.Prokopowicz, F.Recchia, R.V.Ribas, M.W.Reed, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, C.A.Ur, P.M.Walker, O.Wieland, H-J.Wollersheim, F.Nowacki, E.Maglione

New spectroscopic information on 211, 213Tl: A changing structure beyond the N=126 shell closure

NUCLEAR REACTIONS 9Be(238U, F)208Hg/210Hg/211Tl/213Tl/212Pb/214Pb/216Pb/217Bi, E=1 GeV/nucleon; measured reaction products, fragment yields, A/Z plot, Eγ, Iγ, γγ-coin, half-lives of isomers in 211Tl and 213Tl using the FRS-RISING system at GSI facility. 211,213Tl; deduced levels, isomers, J, π, configurations. Comparison with shell model calculations, and seniority isomers observed in 210Pb to 216Pb isotopes.

doi: 10.1103/PhysRevC.99.054326
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2019OZ03      Phys.Lett. B 797, 134800 (2019)

F.C.Ozturk, B.Akkus, D.Atanasov, H.Beyer, F.Bosch, D.Boutin, C.Brandau, P.Buhler, R.B.Cakirli, R.J.Chen, W.D.Chen, X.C.Chen, I.Dillmann, C.Dimopoulou, W.Enders, H.G.Essel, T.Faestermann, O.Forstner, B.S.Gao, H.Geissel, R.Gernhauser, R.E.Grisenti, A.Gumberidze, S.Hagmann, T.Heftrich, M.Heil, M.O.Herdrich, P.-M.Hillenbrand, T.Izumikawa, P.Kienle, C.Klaushofer, C.Kleffner, C.Kozhuharov, R.K.Knobel, O.Kovalenko, S.Kreim, T.Kuhl, C.Lederer-Woods, M.Lestinsky, S.A.Litvinov, Yu.A.Litvinov, Z.Liu, X.W.Ma, L.Maier, B.Mei, H.Miura, I.Mukha, A.Najafi, D.Nagae, T.Nishimura, C.Nociforo, F.Nolden, T.Ohtsubo, Y.Oktem, S.Omika, A.Ozawa, N.Petridis, J.Piotrowski, R.Reifarth, J.Rossbach, R.Sanchez, M.S.Sanjari, C.Scheidenberger, R.S.Sidhu, H.Simon, U.Spillmann, M.Steck, Th.Stohlker, B.H.Sun, L.A.Susam, F.Suzaki, T.Suzuki, S.Yu.Torilov, C.Trageser, M.Trassinelli, S.Trotsenko, X.L.Tu, P.M.Walker, M.Wang, G.Weber, H.Weick, N.Winckler, D.F.A.Winters, P.J.Woods, T.Yamaguchi, X.D.Xu, X.L.Yan, J.C.Yang, Y.J.Yuan, Y.H.Zhang, X.H.Zhou

New test of modulated electron capture decay of hydrogen-like 142Pm ions: Precision measurement of purely exponential decay

RADIOACTIVITY 142Pm(EC); measured decay products; deduced T1/2.

doi: 10.1016/j.physletb.2019.134800
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2019PE12      Phys.Lett. B 795, 241 (2019)

C.M.Petrache, P.M.Walker, S.Guo, Q.B.Chen, S.Frauendorf, Y.X.Liu, R.A.Wyss, D.Mengoni, Y.H.Qiang, A.Astier, E.Dupont, R.Li, B.F.Lv, K.K.Zheng, D.Bazzacco, A.Boso, A.Goasduff, F.Recchia, D.Testov, F.Galtarossa, G.Jaworski, D.R.Napoli, S.Riccetto, M.Siciliano, J.J.Valiente-Dobon, M.L.Liu, X.H.Zhou, J.G.Wang, C.Andreoiu, F.H.Garcia, K.Ortner, K.Whitmore, T.Back, B.Cederwall, E.A.Lawrie, I.Kuti, D.Sohler, J.Timar, T.Marchlewski, J.Srebrny, A.Tucholski

Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region

NUCLEAR REACTIONS 122Sn(13C, 5n), E=65 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, B(M1)/B(E2), quasiparticle t-band and the odd-spin partners of the S-bands built on prolate 2qp-proton and oblate 2qp-neutron configurations. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2019.06.040
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2019QI01      Phys.Rev. C 99, 014307 (2019)

Y.H.Qiang, C.M.Petrache, S.Guo, P.M.Walker, D.Mengoni, Q.B.Chen, B.F.Lv, A.Astier, E.Dupont, M.L.Liu, X.H.Zhou, J.G.Wang, D.Bazzacco, A.Boso, A.Goasduff, F.Recchia, D.Testov, F.Galtarossa, G.Jaworski, D.R.Napoli, S.Riccetto, M.Siciliano, J.J.Valiente-Dobon, C.Andreoiu, F.H.Garcia, K.Ortner, K.Whitmore, B.Cederwall, E.A.Lawrie, I.Kuti, D.Sohler, T.Marchlewski, J.Srebrny, A.Tucholski, A.C.Dai, F.R.Xu

Identification of high-K rotation in 130Ba: Testing the consistency of electromagnetic observables

NUCLEAR REACTIONS 122Sn(13C, 5n), E=65 MeV; measured Eγ, Iγ, γγ- and (particle)γ-coin, γγ(θ) using GALILEO array of 25 Compton-suppressed Ge detectors for γ detection, EUCLIDES silicon detector array for charged particles, and the Neutron Wall for neutron detection at the XTU Tandem accelerator facility of INFN-LNL-Legnaro. 130Ba; deduced high-spin levels, J, π, bands, band built on a millisecond Kπ=8- isomer, multipolarities, mixing ratios, configuration, B(E2) ratios, (gK-gR)/Q0 ratios, alignments for the g.s. and Kπ=8- bands, moment of inertia for the 8- band. Systematics of energies relative to a rigid rotor for the bands built on the Kπ=8- isomers in N=74 isotones: 128Xe, 130Ba, 132Ce, 134Nd, 136Sm, 138Gd. Comparison with particle-rotor model calculations.

doi: 10.1103/PhysRevC.99.014307
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2019RU06      Acta Phys.Pol. B50, 661 (2019)

M.Rudigier, R.L.Canavan, P.H.Regan, P.-A.Soderstrom, M.Lebois, J.N.Wilson, N.Jovancevic, S.Bottoni, M.Brunet, N.Cieplicka-Orynczak, S.Courtin, D.T.Doherty, K.Hadynska-Klek, M.Heine, L.W.Iskra, V.Karayonchev, A.Kennington, P.Koseoglou, G.Lotay, G.Lorusso, M.Nakhostin, C.R.Nita, S.Oberstedt, Zs.Podolyak, L.Qi, J.-M.Regis, R.Shearman, P.M.Walker, W.Witt

Isomer Spectroscopy and Sub-nanosecond Half-live Determination in 178W Using the NuBALL Array

NUCLEAR REACTIONS 164Dy(18O, 4n), E=71, 76, 80 MeV; measured reaction products, Eγ, Iγ, γγ-coin; deduced γ-ray energies, J, π, isomeric T1/2, B(E2), intrinsic quadrupole moments. Centroid-shift method. NuBALL array of 24Compton suppressed HPGe Clover detectors, 10 Compton suppressed coaxial HPGe detectors and 20 LaBr3(Ce) scintillators.

doi: 10.5506/aphyspolb.50.661
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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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2018LI46      Phys.Lett. B 784, 392 (2018)

X.Y.Liu, Z.Liu, B.Ding, P.Doornenbal, A.Obertelli, S.M.Lenzi, P.M.Walker, L.X.Chung, B.D.Linh, G.Authelet, H.Baba, D.Calvet, F.Chateau, A.Corsi, A.Delbart, J.-M.Gheller, A.Gillibert, T.Isobe, V.Lapoux, M.Matsushita, S.Momiyama, T.Motobayashi, M.Niikura, F.Nowacki, H.Otsu, C.Peron, A.Peyaud, E.C.Pollacco, J.-Y.Rousse, H.Sakurai, M.Sasano, Y.Shiga, S.Takeuchi, R.Taniuchi, T.Uesaka, H.Wang, K.Yoneda, Y.H.Lam, T.H.Huang, M.D.Sun, W.Q.Zhang, H.Y.Lu, D.S.Hou, F.Browne, Zs.Dombradi, S.Franchoo, F.Giacoppo, A.Gottardo, K.Hadynska-Klek, Z.Korkulu, S.Koyama, Y.Kubota, J.Lee, M.Lettmann, R.Lozeva, K.Matsui, T.Miyazaki, S.Nishimura, C.Louchart, L.Olivier, S.Ota, Z.Patel, E.Sahin, C.Santamaria, C.Shand, P.-A.Soderstrom, G.L.Stefan, D.Steppenbeck, T.Sumikama, D.Suzuki, Zs.Vajta, V.Werner, J.Wu, Z.Xu, X.H.Zhou, Y.H.Zhang, H.S.Xu, F.S.Zhang

Spectroscopy of 65, 6725Mn: Strong coupling in the N=40 "island of inversion"

NUCLEAR REACTIONS 1H(68Fe, X)63Mn/65Mn/67Mn, E=260 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π. Comparison with shell model predictions.

doi: 10.1016/j.physletb.2018.06.067
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2018MA04      Phys.Lett. B 777, 281 (2018)

L.Marmugi, P.M.Walker, F.Renzoni

Coherent gamma photon generation in a Bose-Einstein condensate of 135mCs

RADIOACTIVITY 135Cs(IT); analyzed available data; deduced coherent γ photon generation using a Bose-Einstein condensate.

doi: 10.1016/j.physletb.2017.12.036
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2017CH37      Phys.Rev. C 96, 034302 (2017)

X.C.Chen, Q.Zeng, Yu.A.Litvinov, X.L.Tu, P.M.Walker, M.Wang, Q.Wang, K.Yue, Y.H.Zhang

Statistical approaches to lifetime measurements with restricted observation times

RADIOACTIVITY 94mRu(IT); measured and analyzed half-life of fully-ionized (bare) ions of 8+ isomeric state at 2644 keV using generic statistical methods based on frequentism and Bayesianism, and various filtering and sorting scenarios at the Experimental Cooler Storage Ring (CSRe) in Lanzhou, China; deduced ICC. Comparison with calculations using BrIcc code. Proposed a complete statistical analysis for half-life extraction. See also 2017Ze02 from the same laboratory for details of experimental description.

doi: 10.1103/PhysRevC.96.034302
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2017GU08      Acta Phys.Pol. B48, 601 (2017)

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

Isomer Spectroscopy of Neutron-rich 165, 167Tb

NUCLEAR REACTIONS 9Be(238U, f), E=345 MeV/nucleon; measured fission products β-delayed discrete Eγ, Iγ, X-rays, γγ-coin, Xγ-coin using HPGe. 165,167Tb; deduced neutron-rich deformed nuclei γ-ray spectra, levels, J, π, isomeric states interpreted as hindered E1 decay from single quasi-proton Nilsson configuration to rotational states built on single quasi-proton gs, levels populated in isomeric decays.

doi: 10.5506/APhysPolB.48.601
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2017GU24      Radiat.Phys.Chem. 140, 493 (2017)

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

Isomer spectroscopy of neutron-rich 168Tb103

NUCLEAR REACTIONS 9Be(238U, X)168Tb, E=350 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced γ-ray energies, J, π, isomeric state T1/2. Comparison with blocked BCS pairing Nilsson calculations for a well-deformed prolate shape, available data.

doi: 10.1016/j.radphyschem.2016.12.011
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2017PA25      Phys.Rev. C 96, 034305 (2017)

Z.Patel, P.M.Walker, Zs.Podolyak, P.H.Regan, T.A.Berry, P.-A.Soderstrom, H.Watanabe, E.Ideguchi, G.S.Simpson, S.Nishimura, Q.Wu, F.R.Xu, F.Browne, P.Doornenbal, G.Lorusso, S.Rice, L.Sinclair, T.Sumikama, J.Wu, Z.Y.Xu, N.Aoi, H.Baba, F.L.Bello Garrote, G.Benzoni, R.Daido, Zs.Dombradi, Y.Fang, N.Fukuda, G.Gey, S.Go, A.Gottardo, N.Inabe, T.Isobe, D.Kameda, K.Kobayashi, M.Kobayashi, T.Komatsubara, I.Kojouharov, T.Kubo, N.Kurz, I.Kuti, Z.Li, M.Matsushita, S.Michimasa, C.-B.Moon, H.Nishibata, I.Nishizuka, A.Odahara, E.Sahin, H.Sakurai, H.Schaffner, H.Suzuki, H.Takeda, M.Tanaka, J.Taprogge, Zs.Vajta, A.Yagi, R.Yokoyama

Isomer-delayed γ-ray spectroscopy of A = 159-164 midshell nuclei and the variation of K-forbidden E1 transition hindrance factors

NUCLEAR REACTIONS 9Be(238U, X)159Sm/161Sm/162Sm/163Sm/163Eu/164Eu/165Eu/164Gd, E=345 MeV/nucleon; measured reaction products, delayed Eγ, Iγ, half-lives of isomers using BigRIPS and ZeroDegree spectrometers, and EURICA array at RIBF-RIKEN facility. 159,161,162Sm, 163Eu, 164Gd; deduced levels, J, π, configurations, K-forbidden E1 hindrance factors. Comparison with Nilsson+BCS calculations. 163Sm, 164,165Eu; deduced micro-sec isomers.

doi: 10.1103/PhysRevC.96.034305
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2017TU01      Phys.Rev. C 95, 014610 (2017)

X.L.Tu, A.Kelic-Heil, Yu.A.Litvinov, Zs.Podolyak, Y.H.Zhang, W.J.Huang, H.S.Xu, K.Blaum, F.Bosch, R.J.Chen, X.C.Chen, C.Y.Fu, B.S.Gao, Z.Ge, Z.G.Hu, D.W.Liu, S.A.Litvinov, X.W.Ma, R.S.Mao, B.Mei, P.Shuai, B.H.Sun, Y.Sun, Z.Y.Sun, P.M.Walker, M.Wang, N.Winckler, J.W.Xia, G.Q.Xiao, Y.M.Xing, X.Xu, T.Yamaguchi, X.L.Yan, J.C.Yang, Y.J.Yuan, Q.Zeng, W.Zhang, H.W.Zhao, T.C.Zhao, X.H.Zhou

Application of isochronous mass spectrometry for the study of angular momentum population in projectile fragmentation reactions

NUCLEAR REACTIONS 9Be(78Kr, X)53Fe/53mFe/53Co/53mCo, E=479.4 MeV/nucleon; measured revolution time spectra of the isomeric and ground states of 53Co and 53Fe using isochronous mass spectrometry (IMS) technique at HIRFL-CSR-Lanzhou facility; deduced isomeric ratios for the 19/2 state, and compared with the predictions of theoretical calculations using ABRABLA07 code. 53Fe; calculated production probability of 53Fe versus spin using ABRABLA07 code for the 58Ni, 78Kr, 84Kr, and 112Sn projectiles.

doi: 10.1103/PhysRevC.95.014610
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2017WA12      Phys.Scr. 92, 054001 (2017)

P.M.Walker

Isomer building blocks and K-forbidden decays

doi: 10.1088/1402-4896/aa694d
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2017WA18      Phys.Lett. B 770, 83 (2017)

F.Wang, B.H.Sun, Z.Liu, R.D.Page, C.Qi, C.Scholey, S.F.Ashley, L.Bianco, I.J.Cullen, I.G.Darby, S.Eeckhaudt, A.B.Garnsworthy, W.Gelletly, M.B.Gomez Hornillos, T.Grahn, P.T.Greenlees, D.G.Jenkins, G.A.Jones, P.Jones, D.T.Joss, R.Julin, S.Juutinen, S.Ketelhut, S.Khan, A.Kishada, M.Leino, M.Niikura, M.Nyman, J.Pakarinen, S.Pietri, Z.Podolyak, P.Rahkila, S.Rigby, J.Saren, T.Shizuma, J.Sorri, S.Steer, J.Thomson, N.J.Thompson, J.Uusitalo, P.M.Walker, S.Williams, H.F.Zhang, W.Q.Zhang, L.H.Zhu

Spectroscopic factor and proton formation probability for the d3/2 proton emitter 151mLu

RADIOACTIVITY 151Lu(p) [from 96Ru(58Ni, X)151Lu, E=266, 274 MeV]; measured decay products, Ep, Ip, Eγ, Iγ; deduced γ-ray energies and intensities, spectroscopic factors, proton-decay formation amplitudes, Q-value, T1/2. Comparison with theoretical calculations.

doi: 10.1016/j.physletb.2017.04.034
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2017WA49      Phys.Rev. C 96, 064307 (2017); Erratum Phys.Rev. C 97, 029902 (2018)

F.Wang, B.H.Sun, Z.Liu, C.Qi, L.H.Zhu, C.Scholey, S.F.Ashley, L.Bianco, I.J.Cullen, I.G.Darby, S.Eeckhaudt, A.B.Garnsworthy, W.Gelletly, M.B.Gomez Hornillos, T.Grahn, P.T.Greenlees, D.G.Jenkins, G.A.Jones, P.Jones, D.T.Joss, R.Julin, S.Juutinen, S.Ketelhut, S.Khan, A.Kishada, M.Leino, M.Niikura, M.Nyman, R.D.Page, J.Pakarinen, S.Pietri, Zs.Podolyak, P.Rahkila, S.Rigby, J.Saren, T.Shizuma, J.Sorri, S.Steer, J.Thomson, N.J.Thompson, J.Uusitalo, P.M.Walker, S.Williams

Reinvestigation of the excited states in the proton emitter 151Lu: Particle-hole excitations across the N=Z=64 subshell

NUCLEAR REACTIONS 96Ru(58Ni, 2np), E=266, 274 MeV; measured fusion-evaporation residues, Eγ, Iγ, γγ-coin, pγ-coin using RITU separator, GREAT spectrometer and JUROGAM array at the K130 cyclotron facility of the University of Jyvaskyla. Recoil-Decay Tagging (RDT) technique. 151Lu; deduced high-spin levels, J, π, sequences. Comparison with large-scale shell-model calculations.

doi: 10.1103/PhysRevC.96.064307
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2017WO02      Phys.Rev. C 95, 054308 (2017)

R.T.Wood, P.M.Walker, G.J.Lane, R.J.Carroll, D.M.Cullen, G.D.Dracoulis, S.S.Hota, T.Kibedi, N.Palalani, Zs.Podolyak, M.W.Reed, K.Schiffl, A.M.Wright

Three-quasiparticle isomer in 173Ta and the excitation energy dependence of K-forbidden transition rates

NUCLEAR REACTIONS 168Er(10B, 5n), E=68 MeV beam from ANU 14UD tandem accelerator; measured Eγ, Iγ, γγ-coin, half-lives of isomers by γγ(t) using CAESAR array, and pulsed-beam γ-ray spectroscopy techniques. 173Ta; deduced high-spin levels, J, π, bands, 3-qp isomers, reduced hindrance fν of K-forbidden transitions, configurations. Systematics of reduced hindrances for transitions from isomers in 173,175,177,181,185Ta, 179,181,183W and 181Os.

doi: 10.1103/PhysRevC.95.054308
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2017WU04      Phys.Rev.Lett. 118, 072701 (2017)

J.Wu, S.Nishimura, G.Lorusso, P.Moller, E.Ideguchi, P.-H.Regan, G.S.Simpson, P.-A.Soderstrom, P.M.Walker, H.Watanabe, Z.Y.Xu, H.Baba, F.Browne, R.Daido, P.Doornenbal, Y.F.Fang, G.Gey, T.Isobe, P.S.Lee, J.J.Liu, Z.Li, Z.Korkulu, Z.Patel, V.Phong, S.Rice, H.Sakurai, L.Sinclair, T.Sumikama, M.Tanaka, A.Yagi, Y.L.Ye, R.Yokoyama, G.X.Zhang, T.Alharbi, N.Aoi, F.L.Bello Garrote, G.Benzoni, A.M.Bruce, R.J.Carroll, K.Y.Chae, Z.Dombradi, A.Estrade, A.Gottardo, C.J.Griffin, H.Kanaoka, I.Kojouharov, F.G.Kondev, S.Kubono, N.Kurz, I.Kuti, S.Lalkovski, G.J.Lane, E.J.Lee, T.Lokotko, G.Lotay, C.-B.Moon, H.Nishibata, I.Nishizuka, C.R.Nita, A.Odahara, Zs.Podolyak, O.J.Roberts, H.Schaffner, C.Shand, J.Taprogge, S.Terashima, Z.Vajta, S.Yoshida

94 β-Decay Half-Lives of Neutron-Rich 55Cs to 67Ho: Experimental Feedback and Evaluation of the r-Process Rare-Earth Peak Formation

RADIOACTIVITY 144,145,146,147,148,149,150,151Cs, 146,147,148,149,150,151,152,153,154Ba, 148,149,150,151,152,153,154,155,156La, 150,151,152,153,154,155,156,157,158Ce, 153,154,155,156,157,158,159,160Pr, 156,157,158,159,160,161,162Nd, 159,160,161,162,163Pm, 160,161,162,163,164,165,166Sm, 161,162,163,164,165,166,167,168Eu, 165,166,167,168,169,170Gd, 166,167,168,169,170,171,172Tb, 169,170,171,172,172m,173Dy, 172,173,174,175Ho, 174mEr(β-)[from Be(238U, X), E=345 MeV/nucleon]; measured and analyzed reaction products using BigRIPS separator and ZeroDegree Spectrometer (ZDS), γ rays, half-lives by (implant)β correlations using WAS3ABi and EURICA detection systems at RIBF-RIKEN facility; deduced Gamow-Teller strength functions, r-process abundance pattern in the solar system. Comparison with previous experimental half-lives, and with three theoretical calculations using FRDM+QRPA, KTUY+GT2, and RHB+pn-RQRPA models. Numerical values of half-lives listed in supplementary file.

doi: 10.1103/PhysRevLett.118.072701
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2017WU09      Phys.Rev. C 95, 064314 (2017)

X.Y.Wu, S.K.Ghorui, L.-J.Wang, Y.Sun, M.Guidry, P.M.Walker

Systematic study of multi-quasiparticle K-isomeric bands in tungsten isotopes by the extended projected shell model

NUCLEAR STRUCTURE 174,176,178,180,182,184,186W; calculated levels, J, π, K-isomeric bands, bandhead energies, two- and multi-particle Nilsson configurations, moment of inertia plots, B(E2), B(M1), B(M1)/B(E2), g factors. Comparison with experimental data.

doi: 10.1103/PhysRevC.95.064314
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2016DR08      Rep.Prog.Phys. 79, 076301 (2016)

G.D.Dracoulis, P.M.Walker, F.G.Kondev

Review of metastable states in heavy nuclei

doi: 10.1088/0034-4885/79/7/076301
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2016KN02      Phys.Lett. B 754, 288 (2016)

R.Knobel, M.Diwisch, F.Bosch, D.Boutin, L.Chen, C.Dimopoulou, A.Dolinskii, B.Franczak, B.Franzke, H.Geissel, M.Hausmann, C.Kozhuharov, J.Kurcewicz, S.A.Litvinov, G.Martinez-Pinedo, M.Matos, M.Mazzocco, G.Munzenberg, S.Nakajima, C.Nociforo, F.Nolden, T.Ohtsubo, A.Ozawa, Z.Patyk, W.R.Plass, C.Scheidenberger, J.Stadlmann, M.Steck, B.Sun, T.Suzuki, P.M.Walker, H.Weick, M.-R.Wu, M.Winkler, T.Yamaguchi

First direct mass measurements of stored neutron-rich 129, 130, 131Cd isotopes with FRS-ESR

ATOMIC MASSES 129,130,131Cd; measured mean velocity of the stored fragments; deduced mass excess values of cadmium isotopes and uncertainties. Comparison with AME 2012 evaluation.

doi: 10.1016/j.physletb.2016.01.039
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2016KN03      Eur.Phys.J. A 52, 138 (2016)

R.Knobel, M.Diwisch, H.Geissel, Yu.A.Litvinov, Z.Patyk, W.R.Plass, C.Scheidenberger, B.Sun, H.Weick, F.Bosch, D.Boutin, L.Chen, C.Dimopoulou, A.Dolinskii, B.Franczak, B.Franzke, M.Hausmann, C.Kozhuharov, J.Kurcewicz, S.A.Litvinov, M.Matos, M.Mazzocco, G.Munzenberg, S.Nakajima, C.Nociforo, F.Nolden, T.Ohtsubo, A.Ozawa, J.Stadlmann, M.Steck, T.Suzuki, P.M.Walker, M.Winkler, T.Yamaguchi

New results from isochronous mass measurements of neutron-rich uranium fission fragments with the FRS-ESR-facility at GSI

NUCLEAR REACTIONS 9Be(238U, x), E=410-415 Mev/nucleon; measured reaction products; deduced mass excess for Z=28-62. Compared to AME2012 and other data.

ATOMIC MASSES 68Ge, 91Se, 94Br, 105Y, 106,107Zr, 110Nb, 113Mo, 114,115Tc, 118Ru, 121Rh, 123,124Pd, 126Ag, 138Sb, 141,143I, 149,150Ba, 150,151La, 154Ce, 93Br, 109Nb, 117Ru, 125Ag, 137Sb, 140I; measured correlation between the spread of the revolution time and the number of turns recorded in the ring; deduced mass-excess values.

doi: 10.1140/epja/i2016-16138-6
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2016PA01      Phys.Lett. B 753, 182 (2016)

Z.Patel, Zs.Podolyak, P.M.Walker, P.H.Regan, P.-A.Soderstrom, H.Watanabe, E.Ideguchi, G.S.Simpson, S.Nishimura, F.Browne, P.Doornenbal, G.Lorusso, S.Rice, L.Sinclair, T.Sumikama, J.Wu, Z.Y.Xu, N.Aoi, H.Baba, F.L.Bello Garrote, G.Benzoni, R.Daido, Zs.Dombradi, Y.Fang, N.Fukuda, G.Gey, S.Go, A.Gottardo, N.Inabe, T.Isobe, D.Kameda, K.Kobayashi, M.Kobayashi, T.Komatsubara, I.Kojouharov, T.Kubo, N.Kurz, I.Kuti, Z.Li, H.L.Liu, M.Matsushita, S.Michimasa, C.-B.Moon, H.Nishibata, I.Nishizuka, A.Odahara, E.Sahin, H.Sakurai, H.Schaffner, H.Suzuki, H.Takeda, M.Tanaka, J.Taprogge, Zs.Vajta, F.R.Xu, A.Yagi, R.Yokoyama

Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer

RADIOACTIVITY 160Sm(IT) [from 9Be(238U, X), E=345 MeV/nucleon]; measured decay products, Eγ, Iγ, γ-γ-coinc.; deduced energy levels, J, π, isomeric states T1/2. Comparison with available data.

doi: 10.1016/j.physletb.2015.12.026
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2016PR08      Phys.Rev. C 94, 064316 (2016)

Pragati, A.Y.Deo, Zs.Podolyak, P.M.Walker, A.Algora, B.Rubio, J.Agramunt, L.M.Fraile, N.Al-Dahan, N.Alkhomashi, J.A.Briz, M.E.Estevez Aguado, G.Farrelly, W.Gelletly, A.Herlert, U.Koster, A.Maira

Decay of the N=126, 213Fr nucleus

RADIOACTIVITY 213Fr(α), (EC), (β+)[from U(p, X), E=1.4 GeV pulsed beam at ISOLDE-CERN facility]; measured Eγ, Iγ, (x ray)γ- and γγ-coin using HPGe detectors, conversion electrons, (ce)(x ray)-coin using a Mini-Orange magnetic spectrometer and a Si(Li) detector, half-life of 213Fr decay. 209At, 213Rn; deduced levels, J, π, α and ϵ+β+ feedings, α-hindrance factors and logft values. Comparison of level structure with shell-model calculations.

doi: 10.1103/PhysRevC.94.064316
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2016SE01      J.Phys.(London) G43, 015103 (2016)

J.Sethi, R.Palit, J.J.Carroll, S.Karamian, S.Saha, S.Biswas, Z.Naik, T.Trivedi, M.S.Litz, P.Datta, S.Chattopadhyay, R.Donthi, U.Garg, S.Jadhav, H.C.Jain, S.Kumar, D.Mehta, B.S.Naidu, G.H.Bhat, J.A.Sheikh, S.Sihotra, P.M.Walker

Low-lying states near the Iπ = 6+ isomer in 108Ag

NUCLEAR REACTIONS 100Mo(11B, 3n), E=39 MeV; measured reaction products, Eγ, Iγ, γ-γ-coinc.; deduced σ(θ), σ, energy levels, J, π, γ-ray intensities. Comparison with projected Hartree-Fock calculations.

doi: 10.1088/0954-3899/43/1/015103
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2016SO13      Phys.Lett. B 762, 404 (2016)

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

K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

RADIOACTIVITY 170Tb(β-) [from Be(238U, X), E=345 MeV/nucleon]; measured decay products, Eγ, Iγ; deduced γ-ray energies and intensities, yrast band, J, π, parent nucleus and daughter nucleus isomeric state T1/2. Comparison with available data.

doi: 10.1016/j.physletb.2016.09.058
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2016WA19      Phys.Lett. B 760, 641 (2016)

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

Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

RADIOACTIVITY 172Dy(β-), (IT); measured decay products, Eγ, Iγ; deduced energy levels, J, π, T1/2, B(E2). Comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.

doi: 10.1016/j.physletb.2016.07.057
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2016YU04      Phys.Lett. B 762, 237 (2016)

C.Yuan, Z.Liu, F.Xu, P.M.Walker, Zs.Podolyak, C.Xu, Z.Z.Ren, B.Ding, M.L.Liu, X.Y.Liu, H.S.Xu, Y.H.Zhang, X.H.Zhou, W.Zuo

Isomerism in the "south-east" of 132Sn and a predicted neutron-decaying isomer in 129Pd

NUCLEAR STRUCTURE 134,136,138Sn, 130Cd, 128Pd, 135Sn, 131Cd, 129Pd, 132,134In, 130Ag; calculated energy levels, B(E2) values, one-neutron separation energies, J, π, T1/2. Comparison with available data.

doi: 10.1016/j.physletb.2016.09.030
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2015AK02      Phys.Rev. C 91, 031301 (2015)

A.Akber, M.W.Reed, P.M.Walker, Yu.A.Litvinov, G.J.Lane, T.Kibedi, K.Blaum, F.Bosch, C.Brandau, J.J.Carroll, D.M.Cullen, I.J.Cullen, A.Y.Deo, B.Detwiler, C.Dimopoulou, G.D.Dracoulis, F.Farinon, H.Geissel, E.Haettner, M.Heil, R.S.Kempley, R.Knobel, C.Kozhuharov, J.Kurcewicz, N.Kuzminchuk, S.Litvinov, Z.Liu, R.Mao, C.Nociforo, F.Nolden, W.R.Plass, Zs.Podolyak, A.Prochazka, C.Scheidenberger, D.Shubina, M.Steck, Th.Stohlker, B.Sun, T.P.D.Swan, G.Trees, H.Weick, N.Winckler, M.Winkler, P.J.Woods, T.Yamaguchi

Increased isomeric lifetime of hydrogen-like 192mOs

RADIOACTIVITY 192mOs(IT)[from 9Be(197Au, X), E=478-492 MeV/nucleon]; measured half-life of the highly-charged stored ions using Schottky mass spectrometry in Experimental Storage Ring (ESR) of the isomeric state of 192Os at UNILAC and SIS-18 heavy-ion accelerators of GSI. Discussed increased half-life of the hydrogen-like ions of isomeric state as compared to that of the neutral ions.

doi: 10.1103/PhysRevC.91.031301
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2015JI03      Phys.Rev. C 91, 034309 (2015)

C.F.Jiao, Y.Shi, H.L.Liu, F.R.Xu, P.M.Walker

Shape-coexisting rotation in neutron-deficient Hg and Pb nuclei

NUCLEAR STRUCTURE 184,186Hg, 186,188Pb; calculated levels, J, π for prolate bands. 186Hg; calculated band diagrams and deformations for oblate bands. 186,188Pb; calculated excitation energies and g factors for oblate bands. 178,180,182,184,186Hg, 186,188,190,192,194Pb; calculated deformations, g factors, and excitation energies for oblate high-K states. Angular-momentum-conserved potential energy surface calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.91.034309
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2015MO20      Europhys.Lett. 111, 52001 (2015)

A.I.Morales, G.Benzoni, N.Al-Dahan, S.Vergani, Zs.Podolyak, P.H.Regan, T.P.D.Swan, J.J.Valiente-Dobon, A.Bracco, P.Boutachkov, F.C.L.Crespi, J.Gerl, M.Gorska, S.Pietri, P.M.Walker, H.-J.Wollersheim

First measurement of the β-decay half-life of 206Au

RADIOACTIVITY 206Au(β-); measured decay products, Eγ, Iγ. 206Hg; deduced T1/2, level energies, partial level scheme, J, π. FRDM + QRPA calculations, comparison with available data.

doi: 10.1209/0295-5075/111/52001
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2015SE06      Acta Phys.Pol. B46, 703 (2015)

J.Sethi, R.Palit, J.J.Carroll, S.Karamian, S.Saha, S.Biswas, Z.Naik, T.Trivedi, M.S.Litz, P.Datta, S.Chattopadhyay, R.Donthi, U.Garg, S.Jadhav, H.C.Jain, S.Kumar, D.Mehta, B.S.Naidu, G.H.Bhat, J.A.Sheikh, S.Sihotra, P.M.Walker

Spectroscopy of the Low-lying States Near the High Spin Isomer in 108Ag

NUCLEAR REACTIONS 100Mo(11B, 3n), E=39 MeV; measured reaction products, Eγ, Iγ; deduced energy levels, J, π, γ-ray intensities, branching ratios.

doi: 10.5506/APhysPolB.46.703
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2015SH13      Acta Phys.Pol. B46, 619 (2015)

C.M.Shand, E.Wilson, Zs.Podolyak, H.Grawe, B.A.Brown, B.Fornal, R.V.F.Janssens, M.Bowry, M.Bunce, M.P.Carpenter, R.J.Carroll, C.J.Chiara, N.Cieplicka-Orynczak, A.Y.Deo, G.D.Dracoulis, C.R.Hoffman, R.S.Kempley, F.G.Kondev, G.J.Lane, T.Lauritsen, G.Lotay, M.W.Reed, P.H.Regan, C.Rodriguez Triguero, D.Seweryniak, B.Szpak, P.M.Walker, S.Zhu

Structure of 207Pb Populated in 208Pb + 208Pb Deep-inelastic Collisions

NUCLEAR REACTIONS 208Pb(208Pb, X)207Pb, E=1446 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies, angular distributions of transitions, multipolarities, J, π. Comparison with shell model calculations.

doi: 10.5506/APhysPolB.46.619
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2015WI05      Phys.Lett. B 747, 88 (2015)

E.Wilson, Zs.Podolyak, H.Grawe, B.A.Brown, C.J.Chiara, S.Zhu, B.Fornal, R.V.F.Janssens, C.M.Shand, M.Bowry, M.Bunce, M.P.Carpenter, N.Cieplicka-Orynczak, A.Y.Deo, G.D.Dracoulis, C.R.Hoffman, R.S.Kempley, F.G.Kondev, G.J.Lane, T.Lauritsen, G.Lotay, M.W.Reed, P.H.Regan, C.Rodriguez Triguero, D.Seweryniak, B.Szpak, P.M.Walker

Core excitations across the neutron shell gap in 207Tl

NUCLEAR REACTIONS 208Pb(208Pb, X)207Tl, E=1446 MeV; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π. Comparison with shell-model calculations.

doi: 10.1016/j.physletb.2015.04.055
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2014GO20      Phys.Rev. C 90, 034317 (2014)

A.Gottardo, J.J.Valiente-Dobon, G.Benzoni, S.Lunardi, A.Gadea, A.Algora, N.Al-Dahan, G.de Angelis, Y.Ayyad, D.Bazzacco, J.Benlliure, P.Boutachkov, M.Bowry, A.Bracco, A.M.Bruce, M.Bunce, F.Camera, E.Casarejos, M.L.Cortes, F.C.L.Crespi, A.Corsi, A.M.D.Bacelar, A.Y.Deo, C.Domingo-Pardo, M.Doncel, T.Engert, K.Eppinger, G.F.Farrelly, F.Farinon, E.Farnea, H.Geissel, J.Gerl, N.Goel, M.Gorska, J.Grebosz, E.Gregor, T.Habermann, R.Hoischen, R.Janik, P.R.John, S.Klupp, I.Kojouharov, N.Kurz, S.M.Lenzi, S.Leoni, S.Mandal, R.Menegazzo, D.Mengoni, B.Million, V.Modamio, A.I.Morales, D.R.Napoli, F.Naqvi, R.Nicolini, C.Nociforo, M.Pfutzner, S.Pietri, Zs.Podolyak, A.Prochazka, W.Prokopowicz, F.Recchia, P.H.Regan, M.W.Reed, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, C.A.Ur, P.M.Walker, H.Weick, O.Wieland, H-J.Wollersheim

Isomeric decay spectroscopy of the 217Bi isotope

RADIOACTIVITY 217mBi(IT)[from 9Be(238U, X), E=1 GeV/nucleon]; measured Eγ, Iγ, γγ-coin, isomer half-life by γ(t) using FRS-RISING system at UNILAC-SIS-18 accelerator facility of GSI. 217Bi; deduced levels, J, π, B(E2). Comparison with large-scale shell model calculations and structures of 211,213,215Bi.

NUCLEAR STRUCTURE 211,213,215,217Bi; calculated levels, J, π using large-scale shell model and Kuo-Herling (KH) interaction. Comparison with experimental data.

doi: 10.1103/PhysRevC.90.034317
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2014LI15      Phys.Rev. C 89, 044304 (2014)

H.L.Liu, P.M.Walker, F.R.Xu

Favored configurations for four-quasiparticle K isomerism in the heaviest nuclei

NUCLEAR STRUCTURE 246,248,250,252,254Fm, 248,250,252,254,256No, 250,252,254,256,258Rf, 260,262,264,266,268Hs, 262,264,266,268,270,272Ds, 264,266,268,270,272,274Cn; calculated level energies, Q(α) values, β2, β4 and β6 for ground and two- and four-quasiparticle high-K isomers. Configuration-constrained potential energy surfaces (PES) calculations. Relevance to superheavy nuclei. Comparison with experimental data.

doi: 10.1103/PhysRevC.89.044304
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2014MO02      Phys.Rev. C 89, 014324 (2014)

A.I.Morales, G.Benzoni, A.Gottardo, J.J.Valiente-Dobon, N.Blasi, A.Bracco, F.Camera, F.C.L.Crespi, A.Corsi, S.Leoni, B.Million, R.Nicolini, O.Wieland, A.Gadea, S.Lunardi, M.Gorska, P.H.Regan, Zs.Podolyak, M.Pfutzner, S.Pietri, P.Boutachkov, H.Weick, J.Grebosz, A.M.Bruce, J.Alcantara Nunez, A.Algora, N.Al-Dahan, Y.Ayyad, N.Alkhomashi, P.R.P.Allegro, D.Bazzacco, J.Benlliure, M.Bowry, M.Bunce, E.Casarejos, M.L.Cortes, A.M.D.Bacelar, A.Y.Deo, G.de Angelis, C.Domingo-Pardo, M.Doncel, Zs.Dombradi, K.Eppinger, G.F.Farrelly, F.Farinon, E.Farnea, H.Geissel, J.Gerl, N.Goel, E.Gregor, T.Habermann, R.Hoischen, R.Janik, S.Klupp, I.Kojouharov, N.Kurz, S.Mandal, R.Menegazzo, D.Mengoni, D.R.Napoli, F.Naqvi, C.Nociforo, A.Prochazka, W.Prokopowicz, F.Recchia, R.V.Ribas, M.W.Reed, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, C.A.Ur, P.M.Walker, H.-J.Wollersheim

β-decay studies of neutron-rich Tl, Pb, and Bi isotopes

RADIOACTIVITY 211,212,213Tl, 215Pb, 215,215m,216,216m,217,218,219Bi(β-)[from 9Be(238U, X), E=1 GeV]; measured Eγ, Iγ, γγ-, βγ-, αγ-coin, βα-, (ion)βγ- and (ion)αγ-correlated events, half-life of 215Pb g.s., α spectra from decay of 211Bi, 212,213,214,215,216,217,218Po, 217At, 219,220Rn, 221Fr using FRS separator, RISING array for γ rays, and particle detectors at UNILAC-SIS-GIS facility. 211,212,213Pb, 215Bi, 215,216,217,218Po; deduced levels, J, π, β feedings, configurations. Comparisons with shell model calculations. Discussed role of allowed Gamow-Teller and first-forbidden β transitions.

doi: 10.1103/PhysRevC.89.014324
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2014MO15      Phys.Rev.Lett. 113, 022702 (2014)

A.I.Morales, J.Benlliure, T.Kurtukian-Nieto, K.-H.Schmidt, S.Verma, P.H.Regan, Z.Podolyak, M.Gorska, S.Pietri, R.Kumar, E.Casarejos, N.Al-Dahan, A.Algora, N.Alkhomashi, H.Alvarez-Pol, G.Benzoni, A.Blazhev, P.Boutachkov, A.M.Bruce, L.S.Caceres, I.J.Cullen, A.M.D.Bacelar, P.Doornenbal, M.E.Estevez Aguado, G.Farrelly, Y.Fujita, A.B.Garnsworthy, W.Gelletly, J.Gerl, J.Grebosz, R.Hoischen, I.Kojouharov, N.Kurz, S.Lalkovski, Z.Liu, C.Mihai, F.Molina, D.Mucher, B.Rubio, H.Shaffner, S.J.Steer, A.Tamii, S.Tashenov, J.J.Valiente-Dobon, P.M.Walker, H.J.Wollersheim, P.J.Woods

Half-Life Systematics across the N=126 Shell Closure: Role of First-Forbidden Transitions in the β Decay of Heavy Neutron-Rich Nuclei

NUCLEAR REACTIONS Be(208Pb, X)192Re/194Re/195Re/196Re/199Os/200Os/198Ir/199Ir/200Ir/201Ir/202Ir/203Pt/204Pt/204Au/205Au/211Tl/212Tl/213Tl/215Pb/215Bi/216Bi/217Bi/218Bi/219Bi, E=1 GeV/nucleon; measured reaction products, Eγ, Iγ; deduced T1/2. Comparison with FRDM, QRPA calculations.

doi: 10.1103/PhysRevLett.113.022702
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2014MU03      Phys.Rev. C 89, 044309 (2014)

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

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

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

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

doi: 10.1103/PhysRevC.89.044309
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2014PA55      Phys.Rev.Lett. 113, 262502 (2014)

Z.Patel, P.-A.Soderstrom, Zs.Podolyak, P.H.Regan, P.M.Walker, H.Watanabe, E.Ideguchi, G.S.Simpson, H.L.Liu, S.Nishimura, Q.Wu, F.R.Xu, F.Browne, P.Doornenbal, G.Lorusso, S.Rice, L.Sinclair, T.Sumikama, J.Wu, Z.Y.Xu, N.Aoi, H.Baba, F.L.Bello Garrote, G.Benzoni, R.Daido, Y.Fang, N.Fukuda, G.Gey, S.Go, A.Gottardo, N.Inabe, T.Isobe, D.Kameda, K.Kobayashi, M.Kobayashi, T.Komatsubara, I.Kojouharov, T.Kubo, N.Kurz, I.Kuti, Z.Li, M.Matsushita, S.Michimasa, C.-B.Moon, H.Nishibata, I.Nishizuka, A.Odahara, E.Sahin, H.Sakurai, H.Schaffner, H.Suzuki, H.Takeda, M.Tanaka, J.taprogge, Zs.Vajta, A.Yagi, R.Yokoyama

Isomer Decay Spectroscopy of 164Sm and 166Gd: Midshell Collectivity Around N=100

NUCLEAR REACTIONS 9Be(238U, X)166Gd/164Sm, E=345 MeV/nucleon; measured reaction products, Eγ, Iγ; deduced level energies, intensities, J, π, isomeric state T1/2. Total energy surface calculations.

doi: 10.1103/PhysRevLett.113.262502
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2013BA29      Phys.Lett. B 723, 302 (2013)

A.M.D.Bacelar, A.M.Bruce, Zs.Podolyak, N.Al-Dahan, M.Gorska, S.Lalkovski, S.Pietri, M.V.Ricciardi, A.Algora, N.Alkhomashi, J.Benlliure, P.Boutachkov, A.Bracco, E.Calore, E.Casarejos, I.J.Cullen, A.Y.Deo, P.Detistov, Zs.Dombradi, C.Domingo-Pardo, M.Doncel, F.Farinon, G.F.Farrelly, H.Geissel, W.Gelletly, J.Gerl, N.Goel, J.Grebosz, R.Hoischen, I.Kojouharov, N.Kurz, S.Leoni, F.Molina, D.Montanari, A.I.Morales, A.Musumarra, D.R.Napoli, R.Nicolini, C.Nociforo, A.Prochazka, W.Prokopowicz, P.H.Regan, B.Rubio, D.Rudolph, K.-H.Schmidt, H.Schaffner, S.J.Steer, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, J.J.Valiente-Dobon, S.Verma, P.M.Walker, H.Weick, H.J.Wollersheim

The population of metastable states as a probe of relativistic-energy fragmentation reactions

NUCLEAR REACTIONS 9Be(238U, X)198Po/200Po/206Po/208Po/208At/209At/210At/211At/210Rn/211Rn/212Rn/213Rn/214Rn/208Fr/211Fr/212Fr/213Fr/214Fr/210Ra/211Ra/212Ra/214Ra/215Ra/215Ac, E=1 GeV/nucleon; measured reaction products, E γ, Iγ; deduced isomeric ratios, high-spin isomers. Comparison with theoretical isomeric ratios calculated in the framework of the abrasion-ablation model.

doi: 10.1016/j.physletb.2013.05.033
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2013CH02      J.Phys.(London) G40, 015101 (2013)

F.-Q.Chen, Y.Sun, P.M.Walker, G.D.Dracoulis, Y.R.Shimizu, J.A.Sheikh

Mixing effects on K-forbidden transition rates from the 6+ isomers in the N = 104 isotones

RADIOACTIVITY 172Er, 174Yb, 176Hf, 178W(IT); calculated B(E2) values for transitions from 6+ isomers, deformation parameters, transition rates, level energies, J, π, matrix elements. PSM calculations, comparison with experimental data.

doi: 10.1088/0954-3899/40/1/015101
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2013CH12      Phys.Rev.Lett. 110, 122502 (2013)

L.Chen, P.M.Walker, H.Geissel, Yu.A.Litvinov, K.Beckert, P.Beller, F.Bosch, D.Boutin, L.Caceres, J.J.Carroll, D.M.Cullen, I.J.Cullen, B.Franzke, J.Gerl, M.Gorska, G.A.Jones, A.Kishada, R.Knobel, C.Kozhuharov, J.Kurcewicz, S.A.Litvinov, Z.Liu, S.Mandal, F.Montes, G.Munzenberg, F.Nolden, T.Ohtsubo, Z.Patyk, W.R.Plass, Zs.Podolyak, S.Rigby, N.Saito, T.Saito, C.Scheidenberger, E.C.Simpson, M.Shindo, M.Steck, B.Sun, S.J.Williams, H.Weick, M.Winkler, H.-J.Wollersheim, T.Yamaguchi

Direct Observation of Long-Lived Isomers in 212Bi

NUCLEAR REACTIONS Be(238U, X)212Bi, E=670 MeV/nucleon; measured revolution frequency; deduced isomeric states excitation energies, level scheme, T1/2. Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.110.122502
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2013GO10      Phys.Lett. B 725, 292 (2013)

A.Gottardo, J.J.Valiente-Dobon, G.Benzoni, A.Gadea, S.Lunardi, P.Boutachkov, A.M.Bruce, M.Gorska, J.Grebosz, S.Pietri, Zs.Podolyak, M.Pfutzner, P.H.Regan, H.Weick, J.Alcantara Nunez, A.Algora, N.Al-Dahan, G.de Angelis, Y.Ayyad, N.Alkhomashi, P.R.P.Allegro, D.Bazzacco, J.Benlliure, M.Bowry, A.Bracco, M.Bunce, F.Camera, E.Casarejos, M.L.Cortes, F.C.L.Crespi, A.Corsi, A.M.D.Bacelar, A.Y.Deo, C.Domingo-Pardo, M.Doncel, Zs.Dombradi, T.Engert, K.Eppinger, G.F.Farrelly, F.Farinon, E.Farnea, H.Geissel, J.Gerl, N.Goel, E.Gregor, T.Habermann, R.Hoischen, R.Janik, P.R.John, S.Klupp, I.Kojouharov, N.Kurz, S.M.Lenzi, S.Leoni, S.Mandal, R.Menegazzo, D.Mengoni, B.Million, V.Modamio, A.I.Morales, D.R.Napoli, F.Naqvi, R.Nicolini, C.Nociforo, A.Prochazka, W.Prokopowicz, F.Recchia, R.V.Ribas, M.W.Reed, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, C.A.Ur, P.M.Walker, O.Wieland, H.-J.Wollersheim

New μs isomers in the neutron-rich 210Hg nucleus

NUCLEAR REACTIONS 9Be(238U, X)210Hg, E=1 GeV/nucleon; measured reaction products and fragments, Eγ, Iγ, (210Hg)γ(t), γγ-coin, isomer T1/2 using FRS-RISING setup at GSI. 210Hg; deduced levels, isomers, J, π. Comparison with level structure in 208Hg, and with shell-model calculations.

doi: 10.1016/j.physletb.2013.07.053
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2013LA11      Phys.Rev. C 87, 034308 (2013)

S.Lalkovski, A.M.Bruce, A.Jungclaus, M.Gorska, M.Pfutzner, L.Caceres, F.Naqvi, S.Pietri, Zs.Podolyak, G.S.Simpson, K.Andgren, P.Bednarczyk, T.Beck, J.Benlliure, G.Benzoni, E.Casarejos, B.Cederwall, F.C.L.Crespi, J.J.Cuenca-Garcia, I.J.Cullen, A.M.D.Bacelar, P.Detistov, P.Doornenbal, G.F.Farrelly, A.B.Garnsworthy, H.Geissel, W.Gelletly, J.Gerl, J.Grebosz, B.Hadinia, M.Hellstrom, C.Hinke, R.Hoischen, G.Ilie, G.Jaworski, J.Jolie, A.Khaplanov, S.Kisyov, M.Kmiecik, I.Kojouharov, R.Kumar, N.Kurz, A.Maj, S.Mandal, V.Modamio, F.Montes, S.Myalski, M.Palacz, W.Prokopowicz, P.Reiter, P.H.Regan, D.Rudolph, H.Schaffner, D.Sohler, S.J.Steer, S.Tashenov, J.Walker, P.M.Walker, H.Weick, E.Werner-Malento, O.Wieland, H.J.Wollersheim, M.Zhekova

Core-coupled states and split proton-neutron quasiparticle multiplets in 122-126Ag

NUCLEAR REACTIONS 9Be(136Xe, X), (238U, F), E=750 MeV/nucleon; measured Eγ, Iγ, γγ-coin, γ(t), half-lives of isomers. FRS separator and RISING array at GSI facility. 122,123,124,125,126Ag; deduced high-spin levels, isomers, total conversion coefficients, multipolarity, J, π, B(E2). Level systematics of odd-A Ag nuclei with N=50-82. Comparison with shell-model calculations.

NUCLEAR STRUCTURE 123,124,125,126,127,128,129Ag; calculated levels, J, π by shell-model using jj45pna interaction.

doi: 10.1103/PhysRevC.87.034308
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2013LA25      Phys.Rev. C 88, 024302 (2013)

S.Lalkovski, A.M.Bruce, A.M.D.Bacelar, M.Gorska, S.Pietri, Zs.Podolyak, P.Bednarczyk, L.Caceres, E.Casarejos, I.J.Cullen, P.Doornenbal, G.F.Farrelly, A.B.Garnsworthy, H.Geissel, W.Gelletly, J.Gerl, J.Grebosz, C.Hinke, G.Ilie, D.Ivanova, G.Jaworski, S.Kisyov, I.Kojouharov, N.Kurz, N.Minkov, S.Myalski, M.Palacz, P.Petkov, W.Prokopowicz, P.H.Regan, H.Schaffner, S.Steer, S.Tashenov, P.M.Walker, H.J.Wollersheim

Submicrosecond isomer in 45117RH72 and the role of triaxiality in its electromagnetic decay rate

NUCLEAR REACTIONS 9Be(238U, F)117Rh/117Ru/121Pd/122Ag/123Ag/124Ag, E=750 MeV/nucleon; measured yields. 9Be(238U, F)117Rh, E=750 MeV/nucleon; measured Eγ, (fragment)γ-coin, (fragment)γ(t), isomer half-life at GSI facility using FRS-RISING setup. 117Rh; deduced level, isomer, J, π, B(Eλ) and B(Mλ) transition probabilities; comparison with deformed shell model, and particle-rotor model calculations. Systematics of low-lying levels and isomers in 101,103,105,107,109,111,113,115Rh nuclei. Role of triaxiality in the decay of isomers.

doi: 10.1103/PhysRevC.88.024302
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2013MO20      Phys.Rev. C 88, 014319 (2013)

A.I.Morales, J.Benlliure, M.Gorska, H.Grawe, S.Verma, P.H.Regan, Zs.Podolyak, S.Pietri, R.Kumar, E.Casarejos, A.Algora, N.Alkhomashi, H.Alvarez-Pol, G.Benzoni, A.Blazhev, P.Boutachkov, A.M.Bruce, L.S.Caceres, I.J.Cullen, A.M.D.Bacelar, P.Doornenbal, M.E.Estevez Aguado, G.Farrelly, Y.Fujita, A.B.Garnsworthy, W.Gelletly, J.Gerl, J.Grebosz, R.Hoischen, I.Kojouharov, N.Kurz, S.Lalkovski, Z.Liu, C.Mihai, F.Molina, D.Mucher, W.Prokopowicz, B.Rubio, H.Schaffner, S.J.Steer, A.Tamii, S.Tashenov, J.J.Valiente-Dobon, P.M.Walker, H.J.Wollersheim, P.J.Woods

β-delayed γ-ray spectroscopy of 203, 204Au and 200-202Pt

RADIOACTIVITY 200,201,202Ir, 203,204Pt(β-)[from 9Be(208Pb, X), E=1 GeV/nucleon]; measured Eγ, Iγ, Eβ, βγ, γγ-coin using the FRS+RISING setup at GSI. 200,201,202Pt, 203,204Au; deduced levels, J, π, multipolarity, β feedings. Comparison with shell-model calculations, and with SDG pair approach.

NUCLEAR STRUCTURE 200,201,202Pt, 203,204Au; calculated levels, J, π. Shell model using OXBASH computer code. Comparison with experimental data.

NUCLEAR REACTIONS 9Be(208Pb, X)200Ir/201Ir/202Ir/203Pt/204Pt, E=1 GeV/nucleon; measured time-of-flight, magnetic rigidity, yields using FRS+RISING facility at GSI.

doi: 10.1103/PhysRevC.88.014319
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2013SE12      Phys.Lett. B 725, 85 (2013)

J.Sethi, R.Palit, S.Saha, T.Trivedi, G.H.Bhat, J.A.Sheikh, P.Datta, J.J.Carroll, S.Chattopadhyay, R.Donthi, U.Garg, S.Jadhav, H.C.Jain, S.Karamian, S.Kumar, M.S.Litz, D.Mehta, B.S.Naidu, Z.Naik, S.Sihotra, P.M.Walker

Structure of nearly degenerate dipole bands in 108Ag

NUCLEAR REACTIONS 100Mo(11B, 3n), E=39 MeV; measured reaction products, Eγ, Iγ, γ-γ-coin.; deduced level energies, J, π, B(M1), B(M1)/B(E2), high spin negative parity states. Comparison with microscopic triaxial projected shell model approach calculations.

doi: 10.1016/j.physletb.2013.06.054
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2013SH30      Phys.Rev. C 88, 024310 (2013)

D.Shubina, R.B.Cakirli, Yu.A.Litvinov, K.Blaum, C.Brandau, F.Bosch, J.J.Carroll, R.F.Casten, D.M.Cullen, I.J.Cullen, A.Y.Deo, B.Detwiler, C.Dimopoulou, F.Farinon, H.Geissel, E.Haettner, M.Heil, R.S.Kempley, C.Kozhuharov, R.Knobel, J.Kurcewicz, N.Kuzminchuk, S.A.Litvinov, Z.Liu, R.Mao, C.Nociforo, F.Nolden, Z.Patyk, W.R.Plass, A.Prochazka, M.W.Reed, M.S.Sanjari, C.Scheidenberger, M.Steck, Th.Stohlker, B.Sun, T.P.D.Swan, G.Trees, P.M.Walker, H.Weick, N.Winckler, M.Winkler, P.J.Woods, T.Yamaguchi, C.Zhou

Schottky mass measurements of heavy neutron-rich nuclides in the element range 70≤Z≤79 at the GSI Experimental Storage Ring

ATOMIC MASSES 181,183Lu, 185,186Hf, 187,188Ta, 189,190,191W, 192,193Re, 195Os; measured masses by Schottky mass spectrometry (SMS) technique using FRS-ESR facility at GSI. 181Hf, 181,182,183,185Ta, 184,186,187W, 189,191Re, 188,190,192,193Os, 191Ir, 194,196Pt, 196Au; measured Schottky frequency spectra for calibration purpose; deduced mass excesses, and compared with AME-2003. 179Lu, 182,182mHf, 184Ta, 186,187,188,190m,192mRe, 189,190m,191,194Os, 190,192,193,194,195Ir, 191Pt; measured Schottky frequency spectra. Bare, H- or He-like isotopes produced in 9Be(197Au, X) reaction using E(197Au)=469.35 MeV/nucleon beam from UNILAC and SIS-18 accelerators at GSI. Investigated correlations between S(2n) and energies of first 2+ states in even-even N=84-124, Z=62-78 isotopes; deduced collectivity. Systematics of S(2n) values for even N=100-124, odd Z=67-77.

doi: 10.1103/PhysRevC.88.024310
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2013WI01      Acta Phys.Pol. B44, 381 (2013)

E.Wilson, Zs.Podolyak, B.Fornal, R.V.F.Janssens, M.Bowry, M.Bunce, M.P.Carpenter, C.J.Chiara, N.Cieplicka, A.Y.Deo, G.D.Dracoulis, H.Grawe, C.R.Hoffman, R.S.Kempley, F.G.Kondev, G.J.Lane, T.Lauritsen, M.W.Reed, P.H.Regan, C.Rodriguez Triguero, B.Szpak, P.M.Walker, S.Zhu

Core Excitations Across the Neutron Shell Gap in 207Tl

NUCLEAR REACTIONS 208Pb(208Pb, X)207Tl/209Bi, E=1446 MeV; measured reaction products, Eγ, Iγ, γ-γ-γ-coin.; deduced transition energies and intensities. Comparison with available data.

doi: 10.5506/APhysPolB.44.381
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2013XU04      Acta Phys.Pol. B44, 271 (2013)

F.R.Xu, H.L.Liu, Y.Shi, H.L.Wang, P.M.Walker, S.Frauendorf, J.C.Pei

New Studies on the Aspects of Nuclear Shapes

NUCLEAR STRUCTURE 158Er, 252,250Fm, 254,252No, 256,254Rf, 66,68,70,72Ge; calculated moment of inertia, quadrupole deformation parameters, tilted crancking total Routhians.

doi: 10.5506/APhysPolB.44.271
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2012AL05      Phys.Rev. C 85, 034301 (2012); Pub.Note Phys.Rev. C 85, 039904 (2012)

N.Al-Dahan, P.H.Regan, Zs.Podolyak, P.M.Walker, N.Alkhomashi, G.D.Dracoulis, G.Farrelly, J.Benlliure, S.B.Pietri, R.F.Casten, P.D.Stevenson, W.Gelletly, S.J.Steer, A.B.Garnsworthy, E.Casarejos, J.Gerl, H.J.Wollersheim, J.Grebosz, M.Gorska, I.Kojouharov, H.Schaffner, A.Algora, G.Benzoni, A.Blazhev, P.Boutachkov, A.M.Bruce, I.J.Cullen, A.M.D.Bacelar, A.Y.Deo, M.E.Estevez, Y.Fujita, R.Hoischen, R.Kumar, S.Lalkovski, Z.Liu, P.J.Mason, C.Mihai, F.Molina, D.Mucher, B.Rubio, A.Tamii, S.Tashenov, J.J.Valiente-Dobon, P.J.Woods

Multiple Β- decaying states in 194Re: Shape evolution in neutron-rich osmium isotopes

NUCLEAR REACTIONS 9Be(208Pb, X)186Hf/187Hf/188Hf/189Hf/188Ta/189Ta/190Ta/191Ta/190W/191W/192W/193W/192Re/193Re/194Re/195Re/196Re/195Os/196Os/197Os/198Os, E=1 GeV/nucleon; measured fragment yields, ion identification by energy loss and time-of-flight methods; deduced decay properties. GSI FRagment Separator (FRS), RISING spectrometer.

RADIOACTIVITY 192,194Re[from 9Be(208Pb, X), E=1 GeV/nucleon](β-); 194Os[from 194Re decay](α); measured Eγ, Iγ, βγ-, (implants)γ-coin, recoil-decay tagging method, half-life. 194Os; deduced levels, J, π. 187Hf, 188,189,190Ta, 190,191W, 192,193Re(IT); measured Eγ, Iγ, half-lives. GSI FRagment Separator (FRS), RISING spectrometer. Systematics of low-lying 0+, 2+, 4+ and 6+ states in N=110-122 Os and W nuclei.

NUCLEAR STRUCTURE 194Re; calculated levels, J, π, configurations using Nilsson multi-quasiparticle (MQP) model.

doi: 10.1103/PhysRevC.85.034301
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2012BE28      Phys.Lett. B 715, 293 (2012)

G.Benzoni, A.I.Morales, J.J.Valiente-Dobon, A.Gottardo, A.Bracco, F.Camera, F.C.L.Crespi, A.M.Corsi, S.Leoni, B.Million, R.Nicolini, O.Wieland, A.Gadea, S.Lunardi, P.Boutachkov, A.M.Bruce, M.Gorska, J.Grebosz, S.Pietri, Zs.Podolyak, M.Pfutzner, P.H.Regan, H.Weick, J.Alcantara Nunez, A.Algora, N.Al-Dahan, G.de Angelis, Y.Ayyad, N.Alkhomashi, P.R.P.Allegro, D.Bazzacco, J.Benlliure, M.Bowry, M.Bunce, E.Casarejos, M.L.Cortes, A.M.D.Bacelar, A.Y.Deo, C.Domingo-Pardo, M.Doncel, Zs.Dombradi, T.Engert, K.Eppinger, G.F.Farrelly, F.Farinon, E.Farnea, H.Geissel, J.Gerl, N.Goel, E.Gregor, T.Habermann, R.Hoischen, R.Janik, S.Klupp, I.Kojouharov, N.Kurz, S.Mandal, R.Menegazzo, D.Mengoni, D.R.Napoli, F.Naqvi, C.Nociforo, A.Prochazka, W.Prokopowicz, F.Recchia, R.V.Ribas, M.W.Reed, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, C.A.Ur, P.M.Walker, H.-J.Wollersheim

First measurement of beta decay half-lives in neutron-rich Tl and Bi isotopes

RADIOACTIVITY 219Bi, 211,212,213Tl(β-) [from Be(238U, X), E=1 GeV/nucleon]; measured decay products, Eγ, Iγ, X-rays; deduced T1/2. Comparison with FRDM+QRPA calculations.

doi: 10.1016/j.physletb.2012.07.063
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2012BR18      J.Phys.:Conf.Ser. 381, 012053 (2012)

A.M.Bruce, A.M.D.Bacelar, G.Benzoni, A.Gadea, M.Gorska, A.Gottardo, S.Pietri, Zs.Podolyak, J.J.Valiente-Dobon, J.A.Alcantara-Nunez, N.Al-Dahan, A.Algora, N.Alkhomashi, P.R.P.Allegro, Y.Ayyad, P.Boutachkov, M.Bowry, M.Bunce, E.Casarejos, M.L.Cortes, A.Y.Deo, C.Domingo-Pardo, M.Doncel, K.Eppinger, F.Farinon, G.F.Farrelly, H.Geissel, J.Gerl, N.Goel, J.Grebosz, E.Gregor, T.Haberman, R.Hoischen, R.Janik, S.Klupp, I.Kojouharov, N.Kurz, S.Lunardi, S.Mandal, R.Menegazzo, D.Mengoni, F.Naqvi, R.Nicolini, C.Nociforo, T.Pissulla, A.Prochazka, W.Prokopowicz, P.H.Regan, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, I.Szarka, P.M.Walker, H.Weick, H.-J.Wollersheim

β decay of 102Y produced in projectile fission of 238U

RADIOACTIVITY 102Y(β-)[from projectile fission of relativistic 238U]; measured β decay, Eγ, Iγ(time), 102Zr γγ-coin. 102Zr deduced γ intensities. Compared to other data.

doi: 10.1088/1742-6596/381/1/012053
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2012CH10      Phys.Rev. C 85, 024324 (2012)

F.-Q.Chen, Y.-X.Liu, Y.Sun, P.M.Walker, G.D.Dracoulis

Residual interactions and the K-mixing-induced fast decay of the three-quasiparticle isomer in 171Tm

NUCLEAR STRUCTURE 171Tm; calculated levels, J, π, B(E2), B(M1), rotational bands, K-mixing matrix elements for the decay of Kπ=19/2+ 3-qp isomer, configurations. Projected shell model with two-body octupole and hexadecapole forces and 3-qp configurations. Comparison with experimental data.

doi: 10.1103/PhysRevC.85.024324
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2012CH19      Nucl.Phys. A882, 71 (2012)

L.Chen, W.R.Plass, H.Geissel, R.Knobel, C.Kozhuharov, Yu.A.Litvinov, Z.Patyk, C.Scheidenberger, K.Siegien-Iwaniuk, B.Sun, H.Weick, K.Beckert, P.Beller, F.Bosch, D.Boutin, L.Caceres, J.J.Carroll, D.M.Cullen, I.J.Cullen, B.Franzke, J.Gerl, M.Gorska, G.A.Jones, A.Kishada, J.Kurcewicz, S.A.Litvinov, Z.Liu, S.Mandal, F.Montes, G.Munzenberg, F.Nolden, T.Ohtsubo, Zs.Podolyak, R.Propri, S.Rigby, N.Saito, T.Saito, M.Shindo, M.Steck, P.M.Walker, S.Williams, M.Winkler, H.-J.Wollersheim, T.Yamaguchi

New results on mass measurements of stored neutron-rich nuclides in the element range from Pt to U with the FRS-ESR facility at 360-400 MeV/u

NUCLEAR REACTIONS 9Be(238U, F), E=670 MeV/nucleon; measured reaction fragments using fragment separator, fragment mass using SMS (Schottky Mass Spectrometry); calculated mass excess;deduced neutron-rich exotic fragments mass using FFT of Schottky frequency spectra, mass excess systematic deviations from modern mass models. Compared with AME03 tables.

ATOMIC MASSES 128Sn, 133Sb, 136Te, 144La, 146Ce, 202Au, 207Hg, 220At, 224,225,226,227,229Fr, 229,230,231,232Ac, 235Th, 235,236,237,238Pa, 202Pt, 213Tl, 217,218Bi, 219,220,221,222Po, 221,222,223,224At, 223,224,225,226,227,228Rn, 228,230,231Fr, 231,232,233,234Ra, 233,234,235,236Ac, 236,237Th; measured revolution frequency spectra; deduced mass excess and their uncertainties, systematic deviations of up to 1500 keV from modern mass models. Comparison with available data.

doi: 10.1016/j.nuclphysa.2012.03.002
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2012GO19      Phys.Rev.Lett. 109, 162502 (2012)

A.Gottardo, J.J.Valiente-Dobon, G.Benzoni, R.Nicolini, A.Gadea, S.Lunardi, P.Boutachkov, A.M.Bruce, M.Gorska, J.Grebosz, S.Pietri, Zs.Podolyak, M.Pfutzner, P.H.Regan, H.Weick, J.Alcantara Nunez, A.Algora, N.Al-Dahan, G.de Angelis, Y.Ayyad, N.Alkhomashi, P.R.P.Allegro, D.Bazzacco, J.Benlliure, M.Bowry, A.Bracco, M.Bunce, F.Camera, E.Casarejos, M.L.Cortes, F.C.L.Crespi, A.Corsi, A.M.D.Bacelar, A.Y.Deo, C.Domingo-Pardo, M.Doncel, Zs.Dombradi, T.Engert, K.Eppinger, G.F.Farrelly, F.Farinon, E.Farnea, H.Geissel, J.Gerl, N.Goel, E.Gregor, T.Habermann, R.Hoischen, R.Janik, S.Klupp, I.Kojouharov, N.Kurz, S.M.Lenzi, S.Leoni, Mandal, R.Menegazzo, D.Mengoni, B.Million, A.I.Morales, D.R.Napoli, F.Naqvi, C.Nociforo, A.Prochazka, W.Prokopowicz, F.Recchia, R.V.Ribas, M.W.Reed, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steiger, P.Strmen, T.P.D.Swan, I.Szarka, C.A.Ur, P.M.Walker, O.Wieland, H-J.Wollersheim, F.Nowacki, E.Maglione, A.P.Zuker

New Isomers in the Full Seniority Scheme of Neutron-Rich Lead Isotopes: The Role of Effective Three-Body Forces

NUCLEAR REACTIONS Be(238U, X)210Pb/212Pb/214Pb/216Pb, E=1 GeV/nucleon; measured reaction products, Eγ, Iγ; deduced level schemes, J, π, B(E2). Comparison with shell model calculations.

doi: 10.1103/PhysRevLett.109.162502
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2012LI31      Phys.Rev. C 86, 011301 (2012)

H.L.Liu, F.R.Xu, P.M.Walker

Understanding the different rotational behaviors of 252No and 254No

NUCLEAR STRUCTURE 250,252,254,256,258Rf, 248,250,252,254,256No, 246,248,250,252,254Fm; calculated kinematic moments of inertia with and without high-order deformation parameters β6, β8. 252,254No; calculated proton and neutron components of the calculated kinematic moments of inertia with and without β6 and β8 parameters, β2, β4, β6, β8 deformation parameters as a function of rotational frequency. Total Routhian surface calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.86.011301
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2012MI18      Eur.Phys.J. A 48, 80 (2012)

N.Minkov, P.M.Walker

Magnetic moments of K isomers as indicators of octupole collectivity

NUCLEAR STRUCTURE 154Nd, 160Sm, 154,156Gd, 236U, 238Pu, 244Cm; calculated neutron single-particle levels, J, π, potential energy vs quadrupole, octupole deformation, magnetic moment using reflection asymmetric shell model.

doi: 10.1140/epja/i2012-12080-y
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2012MY01      Acta Phys.Pol. B43, 253 (2012)

S.Myalski, A.Maj, Zs.Podolyak, M.Kmiecik, P.Bednarczyk, J.Grebosz, P.H.Regan, A.B.Garnsworthy, S.Pietri, D.Rudolph, S.J.Steer, F.Becker, J.Gerl, M.Gorska, H.Grawe, I.Kojouharov, H.Schaffner, H.J.Wollersheim, W.Prokopowicz, G.Benzoni, B.Blank, C.Brandau, A.M.Bruce, L.Caceres, F.Camera, W.N.Catford, I.J.Cullen, Zs.Dombradi, P.Doornenbal, E.Estevez, H.Geissel, W.Gelletly, A.Heinz, R.Hoischen, G.Ilie, G.A.Jones, A.Jungclaus, A.Kelic, F.G.Kondev, T.Kurtukian-Nieto, N.Kurz, S.Lalkovski, Z.Liu, F.Montes, M.Pfutzner, T.Saito, T.Shizuma, A.J.Simons, S.Schwertel, S.Tachenov, P.M.Walker, E.Werner-Malento, O.Wieland

Study of Isomer Production Rates for A=142-152 and Z=62-67 in Fragmentation of a Relativistic 208Pb Beam

NUCLEAR REACTIONS 9Be(208Pb, X)195Pb/196Pb/192Tl/202Po/188Hg/200Po/192Pb/194Pb/198Po/200Po/195Bi/197Bi/193Pb/206Pb/203Tl/205Tl/205Pb/211Bi/204Tl/142Sm/143Eu/145Eu/144Eu/144Gd/152Ho/153Ho/147Gd/148Tb/177Ta/136Sm/138Gd/174Hf/175Hf/176Hf/175Ta/177Ta/179W/181W/181Re/185Re/176Ta/180W/206Hg/182W/200Pt/179Ta/180Ta/203Hg/203Au, E=1 GeV/nucleon; measured reaction products; deduced J, π, isomeric states and ratios. Comparison with theoretical predictions.

doi: 10.5506/APhysPolB.43.253
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2012RE19      Phys.Rev. C 86, 054321 (2012)

M.W.Reed, P.M.Walker, I.J.Cullen, Yu.A.Litvinov, D.Shubina, G.D.Dracoulis, K.Blaum, F.Bosch, C.Brandau, J.J.Carroll, D.M.Cullen, A.Y.Deo, B.Detwiler, C.Dimopoulou, G.X.Dong, F.Farinon, H.Geissel, E.Haettner, M.Heil, R.S.Kempley, R.Knobel, C.Kozhuharov, J.Kurcewicz, N.Kuzminchuk, S.Litvinov, Z.Liu, R.Mao, C.Nociforo, F.Nolden, W.R.Plass, Zs.Podolyak, A.Prochazka, C.Scheidenberger, M.Steck, Th.Stohlker, B.Sun, T.P.D.Swan, G.Trees, H.Weick, N.Winckler, M.Winkler, P.J.Woods, F.R.Xu, T.Yamaguchi

Long-lived isomers in neutron-rich Z=72-76 nuclides

NUCLEAR REACTIONS Be(197Au, X)183Hf/184Hf/186Hf/186Ta/187Ta, 186W/190W/190Re/192Re/194Re/194Ir/194Os/195Os/196Pt, E=478-492 MeV/nucleon; measured Schottky mass and frequency spectra, ion revolution frequencies, survival curves of ions, isomer energies and half-lives of highly charged (helium-like, hydrogen-like, and bare) ions, γ spectra. FRS and ESR at UNILAC-SIS accelerator facility in GSI. 183,184,186Hf, 186,187Ta, 186W, 190,192,194Re, 195Os; deduced levels, isomers, J, π, configuration, decay modes. Comparison with potential energy surface, and multi-quasiparticle (MQP) calculations. 186Ta, 192Re; calculated 2qp levels. Systematics of theoretical and experimental 2qp 8- isomers and 4qp levels in 170,172,174,176,178,180,182,184,186,188,190Hf.

doi: 10.1103/PhysRevC.86.054321
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2012RE22      J.Phys.:Conf.Ser. 381, 012058 (2012)

M.W.Reed, P.M.Walker, I.J.Cullen, Yu.A.Litvinov, K.Blaum, F.Bosch, C.Brandau, J.J.Carroll, D.M.Cullen, A.Y.Deo, B.Detwiler, C.Dimopoulou, G.D.Dracoulis, F.Farinon, H.Geissel, E.Haettner, M.Heil, R.S.Kempley, R.Knobel, C.Kozhuharov, J.Kurcewicz, N.Kuzminchuk, S.Litvinov, Z.Liu, R.Mao, C.Nociforo, F.Nolden, W.R.Plass, A.Prochazka, C.Scheidenberger, D.Shubina, M.Steck, Th.Stohlker, B.Sun, T.P.D.Swan, G.Trees, H.Weick, N.Winckler, M.Winkler, P.J.Woods, T.Yamaguchi

Technique for Resolving Low-lying Isomers in the Experimental Storage Ring (ESR) and the Occurrence of an Isomeric State in 192Re

doi: 10.1088/1742-6596/381/1/012058
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2012SH05      Phys.Rev. C 85, 027307 (2012)

Y.Shi, P.M.Walker, F.R.Xu

High-K isomers in neutron-rich zirconium isotopes

NUCLEAR STRUCTURE 104,106,108,110Zr; Calculated levels, J, π, configurations, shapes, and deformation parameters of low-lying states, potential energy surfaces for the lowest energy two-quasiparticle states, high-K isomers. Configuration-constrained potential-energy-surface calculations for ground and high-K states.

doi: 10.1103/PhysRevC.85.027307
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2012SH18      Phys.Rev. C 85, 064304 (2012)

Y.Shi, F.R.Xu, P.M.Walker, G.D.Dracoulis

Superdeformed multi-quasiparticle high-K states and possible isomers in Pb and Po isotopes

NUCLEAR STRUCTURE 192,194,196Pb, 198Po; calculated levels, J, π, configurations, deformations, quadrupole moments, mean half-lives, high-K superdeformed bands. Octupole-vibrational excitations. Total Routhian Configuration-constrained potential-energy surface (PES) calculations.

doi: 10.1103/PhysRevC.85.064304
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2012SW01      Phys.Rev. C 85, 024313 (2012)

T.P.D.Swan, P.M.Walker, Zs.Podolyak, M.W.Reed, G.D.Dracoulis, G.J.Lane, T.Kibedi, M.L.Smith

Discovery of isomers in dysprosium, holmium, and erbium isotopes with N=94 to 97

NUCLEAR REACTIONS 160Gd(9Be, X)161Dy/163Ho/162Er/165Er, E=57 MeV; measured Eγ, Iγ, γγ-coin, delayed γ, γγ(t), half-lives. 161Dy, 163Ho, 162,165Er; deduced levels, J, π, isomers, B(E2), B(M1), B(E1), intrinsic g factors, rotational bands, configurations, angular momentum alignment, reduced hindrance factors. Coriolis and octupole band mixing. Comparison with BCS calculations.

doi: 10.1103/PhysRevC.85.024313
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2012SW02      Phys.Rev. C 86, 044307 (2012)

T.P.D.Swan, P.M.Walker, Zs.Podolyak, M.W.Reed, G.D.Dracoulis, G.J.Lane, T.Kibedi, M.L.Smith

Hindered decays from a non-yrast four-quasiparticle isomer in 164Er

NUCLEAR REACTIONS 160Gd(9Be, 5n), E=57 MeV; measured Eγ, Iγ, γγ-coin, isomer half-life by γ(t) using CAESAR array at ANU facility. 164Er; deduced levels, J, π, bands, total conversion coefficients, configurations, branching ratio, hindrance factor, forbiddenness. Highly K-forbidden γ-ray transitions. Systematics of E2 and E3 reduced-hindrance factors in 164Er, 174Yb, 174,175,176,177,178Hf, 174,176,179,180,181W, 179Ta, 182,183,184Os.

doi: 10.1103/PhysRevC.86.044307
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2012WA29      J.Phys.(London) G39, 105106 (2012)

P.M.Walker, F.R.Xu, H.L.Liu, Y.Sun

On the possibility of enhanced fission stability for broken-pair excitations

RADIOACTIVITY 250,254No, 256Fm(α); analyzed experimental data for high-K isomer fission; calculated high-K isomer energies as function of quadrupole deformation parameters. Potential energy surface calculations, comparison with experimental data.

doi: 10.1088/0954-3899/39/10/105106
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2011GO39      J.Phys.:Conf.Ser. 312, 092026 (2011)

A.Gottardo, J.J.Valiente-Dobon, G.Benzoni, R.Nicolini, J.Alcantara Nunez, A.Algora, N.Al-Dahan, G.de Angelis, Y.Ayyad, N.Alkhomashi, P.R.P.Allegro, J.Benlliure, P.Boutachkov, M.Bowry, A.Bracco, A.M.Bruce, M.Bunce, E.Casarejos, L.Cortes, F.C.L.Crespi, F.Camera, A.Corsi, A.M.D.Bacelar, A.Deo, C.Domingo-Pardo, M.Doncel, Zs.Dombradi, T.Engert, K.Eppinger, G.F.Farrelly, F.Farinon, A.Gadea, H.Geissel, J.Gerl, N.Goel, M.Gorska, J.Grebosz, E.Gregor, T.Haberman, R.Hoischen, R.Janik, S.Klupp, I.Kojouharov, N.Kurz, S.Leoni, S.Lunardi, S.Mandal, R.Menegazzo, D.Mengoni, B.Million, D.R.Napoli, F.Naqvi, C.Nociforo, M.Pfutzner, S.Pietri, Zs.Podolyak, A.Prochazka, W.Prokopowicz, F.Recchia, R.V.Ribas, M.W.Reed, P.H.Regan, D.Rudolph, E.Sahin, H.Schaffner, A.Sharma, B.Sitar, D.Siwal, K.Steger, P.Strmen, T.P.D.Swan, I.Szarka, P.M.Walker, O.Wieland, H.Weick, H.-J.Wollersheim

Isomers in neutron-rich lead isotopes populated via the fragmentation of 238U at 1 GeV A

NUCLEAR REACTIONS 9Be(238U, X), E=1 GeV/nucleon; measured reaction products using double-stage magnetic spectrometer FRS, delayed Eγ, Iγ(t) gated with ER; deduced possible isomeric transitions.

doi: 10.1088/1742-6596/312/9/092026
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2011HA15      Int.J.Mod.Phys. E20, 474 (2011)

A.B.Hayes, D.Cline, C.Y.Wu, A.M.Hurst, M.P.Carpenter, J.P.Greene, R.V.F.Janssens, T.Lauritsen, D.Seweryniak, S.Zhu, S.A.Karamian, P.M.Walker, T.P.D.Swan, S.V.Rigby, D.M.Cullen, N.M.Lumley, P.Mason, J.J.Carroll, B.Detwiler, T.Harle, I.Mills, G.Trees

New structures in 178Hf and Coulomb excitation of isomers

NUCLEAR REACTIONS 208Pb(178Hf, 178Hf'), E=985 MeV; measured Eγ, Iγ, particle-γ-coin.; deduced energy levels, J, π, isomer bands, rotational sequence feeding.

doi: 10.1142/S0218301311017879
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2011LI04      Phys.Rev. C 83, 011303 (2011)

H.L.Liu, F.R.Xu, P.M.Walker, C.A.Bertulani

Effects of high-order deformation on high-K isomers in superheavy nuclei

NUCLEAR STRUCTURE 254No; calculated potential energy surfaces, multi-quasiparticle states, levels, J, π, high-K isomers, neutron and proton single particle levels using the Woods-Saxon potential, β2, β4, β6 deformations. Configuration-constrained potential-energy-surface (PES) calculations. Effects of the β6 deformation on the high-K isomers. Comparison with experimental data.

doi: 10.1103/PhysRevC.83.011303
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2011LI26      Phys.Rev. C 83, 067303 (2011)

H.L.Liu, F.R.Xu, P.M.Walker, C.A.Bertulani

Deformation and its influence on K isomerism in neutron-rich Hf nuclei

NUCLEAR STRUCTURE 176,178,180,182,184,186,188,190,192Hf; calculated excitation energies, β2, β4 deformations for multi-qp isomeric states, configurations of K isomers, potential energy curves as function of γ deformation parameter. Configuration-constrained calculations of potential-energy surfaces. Comparison with experimental data.

doi: 10.1103/PhysRevC.83.067303
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2011LI44      Eur.Phys.J. A 47, 135 (2011)

H.L.Liu, F.R.Xu, Y.Sun, P.M.Walker, R.Wyss

On the stability of high-K stability of high-K isomers in the second well of actinide nuclei

NUCLEAR STRUCTURE 238U, 236,238,242Pu, 240,242,244Cm; calculated levels, K, π, β2, β4, configurations, energy surface for broken-pair excitations. Energies compared to data.

doi: 10.1140/epja/i2011-11135-y
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2011NI01      Phys.Rev.Lett. 106, 052502 (2011)

S.Nishimura, Z.Li, H.Watanabe, K.Yoshinaga, T.Sumikama, T.Tachibana, K.Yamaguchi, M.Kurata-Nishimura, G.Lorusso, Y.Miyashita, A.Odahara, H.Baba, J.S.Berryman, N.Blasi, A.Bracco, F.Camera, J.Chiba, P.Doornenbal, S.Go, T.Hashimoto, S.Hayakawa, C.Hinke, E.Ideguchi, T.Isobe, Y.Ito, D.G.Jenkins, Y.Kawada, N.Kobayashi, Y.Kondo, R.Krucken, S.Kubono, T.Nakano, H.Sakurai, H.Scheit, K.Steiger, D.Steppenbeck, K.Sugimoto, H.J.Ong, S.Ota, Zs.Podolyak, S.Takano, A.Takashima, K.Tajiri, T.Teranishi, Y.Wakabayashi, P.M.Walker, O.Wieland, H.Yamaguchi

β-Decay Half-Lives of Very Neutron-Rich Kr to Tc Isotopes on the Boundary of the r-Process Path: An Indication of Fast r-Matter Flow

RADIOACTIVITY 97,98,99,100Kr(β-), 97,98,99,100,101,102Rb(β-), 101,102,103,104,105Sr, 103,104,105,106,107,108Y(β-), 108,109,110Zr(β-), 111,112Nb(β-), 112,113,114,115Mo(β-), 116,117Tc(β-) [from Be(238U, X), E=345 MeV/nucleon]; measured decay products, Ee, Ie; deduced T1/2. Comparison with FRDM+QRPA, KTUY+GT2 model calculations, astrophysical r-process path.

doi: 10.1103/PhysRevLett.106.052502
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2011ST21      Phys.Rev. C 84, 044313 (2011)

S.J.Steer, Zs.Podolyak, S.Pietri, M.Gorska, H.Grawe, K.H.Maier, P.H.Regan, D.Rudolph, A.B.Garnsworthy, R.Hoischen, J.Gerl, H.J.Wollersheim, F.Becker, P.Bednarczyk, L.Caceres, P.Doornenbal, H.Geissel, J.Grebosz, A.Kelic, I.Kojouharov, N.Kurz, F.Montes, W.Prokopwicz, T.Saito, H.Schaffner, S.Tashenov, A.Heinz, M.Pfutzner, T.Kurtukian-Nieto, G.Benzoni, A.Jungclaus, D.L.Balabanski, M.Bowry, C.Brandau, A.Brown, A.M.Bruce, W.N.Catford, I.J.Cullen, Zs.Dombradi, M.E.Estevez, W.Gelletly, G.Ilie, J.Jolie, G.A.Jones, M.Kmiecik, F.G.Kondev, R.Krucken, S.Lalkovski, Z.Liu, A.Maj, S.Myalski, S.Schwertel, T.Shizuma, P.M.Walker, E.Werner-Malento, O.Wieland

Isomeric states observed in heavy neutron-rich nuclei populated in the fragmentation of a 208Pb beam

NUCLEAR REACTIONS 9Be(208Pb, X)183Hf/184Hf/185Hf/186Hf/187Hf/188Hf/186Ta/187Ta/188Ta/189Ta/190Ta/189W/190W/191W/192W/193W/194W/192Re/193Re/194Re/195Re/196Re/197Re/195Os/196Os/197Os/198Os/199Os/200Os/197Ir/198Ir/199Ir/200Ir/201Ir/202Ir/203Ir/200Pt/201Pt/202Pt/203Pt/204Pt/204Au/205Au, E=1 GeV/nucleon; measured magnetic rigidity, energy loss, time of flight, Eγ, Iγ, isomeric half-lives and ratios. FRS at GSI facility. 206Tl, 203,204,205,206Hg, 201,202,203,204,205Au, 197,198,199,200,201,202,203,204Pt, 195,198,199,200,201,202,203Ir, 193,195,197,198,199Os, 191,192,193,194,196Re, 190,191W, 188,189Ta; deduced levels, isomers, J, π, half-lives, B(E2), B(M2), B(E3), B(M4). Comparison with shell-model and BCS calculations.

doi: 10.1103/PhysRevC.84.044313
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2011SU11      Phys.Rev.Lett. 106, 202501 (2011)

T.Sumikama, K.Yoshinaga, H.Watanabe, S.Nishimura, Y.Miyashita, K.Yamaguchi, K.Sugimoto, J.Chiba, Z.Li, H.Baba, J.S.Berryman, N.Blasi, A.Bracco, F.Camera, P.Doornenbal, S.Go, T.Hashimoto, S.Hayakawa, C.Hinke, E.Ideguchi, T.Isobe, Y.Ito, D.G.Jenkins, Y.Kawada, N.Kobayashi, Y.Kondo, R.Krucken, S.Kubono, G.Lorusso, T.Nakano, M.Kurata-Nishimura, A.Odahara, H.J.Ong, S.Ota, Zs.Podolyak, H.Sakurai, H.Scheit, K.Steiger, D.Steppenbeck, S.Takano, A.Takashima, K.Tajiri, T.Teranishi, Y.Wakabayashi, P.M.Walker, O.Wieland, H.Yamaguchi

Structural Evolution in the Neutron-Rich Nuclei 106Zr and 108Zr

RADIOACTIVITY 106,108Zr, 104,105,106Y(β-) [from Be(238U, X), E=345 MeV/nucleon]; measured time correlations, Eγ, Iγ; deduced first 2+ and 4+ states energies, J, π, ground state deformation in 106,108Zr, T1/2 for a new isomer in 108Zr and 106Y. Comparison with 1/E(2+) systematics for Kr, Sr, Zr, Mo, Ru, Pd, Cd, Sn isotopes.

doi: 10.1103/PhysRevLett.106.202501
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2011SW02      Phys.Rev. C 83, 034322 (2011), Publishers Note Phys.Rev. C 83, 049903 (2011)

T.P.D.Swan, P.M.Walker, Zs.Podolyak, M.W.Reed, G.D.Dracoulis, G.J.Lane, T.Kibedi, M.L.Smith

Discovery of a nonyrast Kπ = 8+ isomer in 162Dy, and the influence of competing K-mixing mechanisms on its highly forbidden decay

NUCLEAR REACTIONS 160Gd(9Be, 3nα), E=57 MeV; measured Eγ, Iγ, γγ-coin, γγ(t), pulsed beam, isomer half-lives. 162Dy; deduced levels, J, π, isomer, bands, multipolarity, hindrance factors, alignment plots, configurations. Analyzed small deviations from NpNn dependence.

doi: 10.1103/PhysRevC.83.034322
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2011WA03      Phys.Lett. B 696, 186 (2011)

H.Watanabe, T.Sumikama, S.Nishimura, K.Yoshinaga, Z.Li, Y.Miyashita, K.Yamaguchi, H.Baba, J.S.Berryman, N.Blasi, A.Bracco, F.Camera, J.Chiba, P.Doornenbal, S.Go, T.Hashimoto, S.Hayakawa, C.Hinke, E.Ideguchi, T.Isobe, Y.Ito, D.G.Jenkins, Y.Kawada, N.Kobayashi, Y.Kondo, R.Krucken, S.Kubono, G.Lorusso, T.Nakano, M.Kurata-Nishimura, A.Odahara, H.J.Ong, S.Ota, Zs.Podolyak, H.Sakurai, H.Scheit, Y.Shi, K.Steiger, D.Steppenbeck, K.Sugimoto, K.Tajiri, S.Takano, A.Takashima, T.Teranishi, Y.Wakabayashi, P.M.Walker, O.Wieland, F.R.Xu, H.Yamaguchi

Low-lying level structure of the neutron-rich nucleus 109Nb: A possible oblate-shape isomer

NUCLEAR REACTIONS Be(238U, X)109Nb/109Zr, E=345 MeV/nucleon; measured fission fragments, Eγ, Iγ, β-γ-coin.; deduced level scheme, J, π, T1/2 for isomeric state in 109Nb, B(E1), B(M1), B(E2), B(M2), low-lying oblate-deformed states. Nilsson diagrams, calculation of potential energy surfaces.

doi: 10.1016/j.physletb.2010.12.028
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2011WA26      Phys.Lett. B 704, 270 (2011)

H.Watanabe, K.Yamaguchi, A.Odahara, T.Sumikama, S.Nishimura, K.Yoshinaga, Z.Li, Y.Miyashita, K.Sato, L.Prochniak, H.Baba, J.S.Berryman, N.Blasi, A.Bracco, F.Camera, J.Chiba, P.Doornenbal, S.Go, T.Hashimoto, S.Hayakawa, C.Hinke, N.Hinohara, E.Ideguchi, T.Isobe, Y.Ito, D.G.Jenkins, Y.Kawada, N.Kobayashi, Y.Kondo, R.Krucken, S.Kubono, G.Lorusso, T.Nakano, T.Nakatsukasa, M.Kurata-Nishimura, H.J.Ong, S.Ota, Zs.Podolyak, H.Sakurai, H.Scheit, K.Steiger, D.Steppenbeck, K.Sugimoto, K.Tajiri, S.Takano, A.Takashima, T.Teranishi, Y.Wakabayashi, P.M.Walker, O.Wieland, H.Yamaguchi

Development of axial asymmetry in the neutron-rich nucleus 110Mo

RADIOACTIVITY 110Nb(β-) [from Be(238U, X), E=345 MeV/nucleon]; measured decay products, Eγ, Iγ, X-rays. 110Mo; deduced energy levels, J, π, quasi-γ-band state, B(e2) ratio. Comparison with general Bohr Hamiltonian method calculations, systematics of low-lying levels of even-even Mo nuclei.

NUCLEAR STRUCTURE 104,106,108,110Mo; calculated moments of inertia, potential energy surface, the nuclear landscape. General Bohr Hamiltonian method calculations.

doi: 10.1016/j.physletb.2011.09.050
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2010BR15      Phys.Rev. C 82, 044312 (2010)

A.M.Bruce, S.Lalkovski, A.M.D.Bacelar, M.Gorska, S.Pietri, Zs.Podolyak, Y.Shi, P.M.Walker, F.R.Xu, P.Bednarczyk, L.Caceres, E.Casarejos, I.J.Cullen, P.Doornenbal, G.F.Farrelly, A.B.Garnsworthy, H.Geissel, W.Gelletly, J.Gerl, J.Grebosz, C.Hinke, G.Ilie, G.Jaworski, I.Kojouharov, N.Kurz, S.Myalski, M.Palacz, W.Prokopowicz, P.H.Regan, H.Schaffner, S.Steer, S.Tashenov, H.J.Wollersheim

Shape coexistence and isomeric states in neutron-rich 112Tc and 113Tc

NUCLEAR REACTIONS 9Be(238U, F), E=11.4, 750 MeV/nucleon; measured Eγ, Iγ, (fragment)γ-, γγ-coin, γγ(t), energy loss and time-of-flight, isomer half-lives. 112,113Tc; deduced levels, J, π, oblate and triaxial structures. Comparison with Potential energy surface (PES) calculations.

NUCLEAR REACTIONS 9Be(238U, F)100Y/101Y/102Y/103Y/104Y/, 103Zr/104Zr/105Zr/106Zr/107Zr/105Nb/106Nb/107Nb/108Nb/109Nb/108Mo/109Mo/110Mo/111Mo/112Mo/110Tc/111Tc/112Tc/113Tc/114Tc/E=11.4, 750 MeV/nucleon; measured energy loss time-of-flight, yields.

doi: 10.1103/PhysRevC.82.044312
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2010CH19      Phys.Lett. B 691, 234 (2010)

L.Chen, W.R.Plass, H.Geissel, R.Knobel, C.Kozhuharov, Yu.A.Litvinov, Z.Patyk, C.Scheidenberger, K.Siegien-Iwaniuk, B.Sun, H.Weick, K.Beckert, P.Beller, F.Bosch, D.Boutin, L.Caceres, J.J.Carroll, D.M.Cullen, I.J.Cullen, B.Franzke, J.Gerl, M.Gorska, G.A.Jones, A.Kishada, J.Kurcewicz, S.A.Litvinov, Z.Liu, S.Mandal, F.Montes, G.Munzenberg, F.Nolden, T.Ohtsubo, Zs.Podolyak, R.Propri, S.Rigby, N.Saito, T.Saito, M.Shindo, M.Steck, P.Ugorowski, P.M.Walker, S.Williams, M.Winkler, H.-J.Wollersheim, T.Yamaguchi

Discovery and investigation of heavy neutron-rich isotopes with time-resolved Schottky spectrometry in the element range from thallium to actinium

NUCLEAR REACTIONS Be(238U, X)236Ac/224At/222Po/221Po/213Tl, E=670 MeV/nucleon; measured revolution frequency of the cooled fragments; deduced T1/2. Comparison with theoretical models, Darmstadt storage-cooler ring ESR.

ATOMIC MASSES 236Ac, 224At, 222Po, 221Po, 213Tl; measured revolution frequency of the cooled fragments; deduced atomic masses.

doi: 10.1016/j.physletb.2010.05.078
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2010DE04      Phys.Rev. C 81, 024322 (2010)

A.Y.Deo, Zs.Podolyak, P.M.Walker, A.Algora, B.Rubio, J.Agramunt, L.M.Fraile, N.Al-Dahan, N.Alkhomashi, J.A.Briz, E.Estevez, G.Farrelly, W.Gelletly, A.Herlert, U.Koster, A.Maira, S.Singla

Structures of 201Po and 205Rn from EC/β+-decay studies

RADIOACTIVITY 201At, 205Fr(EC), (β+)[from U(p, X), E=1.4 GeV]; measured Eγ, Iγ, ce, γγ-, γ(ce)-coin, half-lives, K-conversion coefficients, and EC/β+ branching ratios. 201Po, 205Rn; deduced levels, J, π, multipolarity, and logft. Systematics of 3/2- and 13/2+ states in Pb, Po, and Rn nuclei with N=117, 119, 121 and 123.

doi: 10.1103/PhysRevC.81.024322
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2010MU13      Phys.Rev. C 82, 054316 (2010)

G.Mukherjee, P.Chowdhury, F.G.Kondev, P.M.Walker, G.D.Dracoulis, R.D'Alarcao, I.Shestakova, K.Abu Saleem, I.Ahmad, M.P.Carpenter, A.Heinz, R.V.F.Janssens, T.L.Khoo, T.Lauritsen, C.J.Lister, D.Seweryniak, I.Wiedenhoever, D.M.Cullen, C.Wheldon, D.L.Balabanski, M.Danchev, T.M.Goon, D.J.Hartley, L.L.Riedinger, O.Zeidan, M.A.Riley, R.A.Kaye, G.Sletten

K-hindered decay of a six-quasiparticle isomer in 176Hf

NUCLEAR REACTIONS 130Te(48Ca, 2n), E=194 MeV; measured Eγ, Iγ, γγ-coin, half-lives using Gammasphere array. Beam-on, beam-off measurements of γ spectra. 176Hf; deduced levels, J, π, rotational bands, isomers, multipolarity, configurations, reduced hindrance factors for K-isomers.

doi: 10.1103/PhysRevC.82.054316
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