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NSR database version of April 26, 2024.

Search: Author = J.Wiederhold

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2023GJ01      Phys.Rev. C 108, 064602 (2023)

D.Gjestvang, J.N.Wilson, A.Al-Adili, S.Siem, Z.Gao, J.Randrup, D.Thisse, M.Lebois, N.Jovancevic, R.Canavan, M.Rudigier, D.Etasse, R.-B.Gerst, E.Adamska, P.Adsley, A.Algora, C.Belvedere, J.Benito, G.Benzoni, A.Blazhev, A.Boso, S.Bottoni, M.Bunce, R.Chakma, N.Cieplicka-Orynczak, S.Courtin, M.L.Cortes, P.Davies, C.Delafosse, M.Fallot, B.Fornal, L.Fraile, A.Gottardo, V.Guadilla, G.Hafner, K.Hauschild, M.Heine, C.Henrich, I.Homm, F.Ibrahim, L.W.Iskra, P.Ivanov, S.Jazrawi, A.Korgul, P.Koseoglou, T.Kroll, T.Kurtukian-Nieto, S.Leoni, J.Ljungvall, A.Lopez-Martens, R.Lozeva, I.Matea, K.Miernik, J.Nemer, S.Oberstedt, W.Paulsen, M.Piersa-Silkowska, Y.Popovitch, C.Porzio, L.Qi, P.H.Regan, K.Rezynkina, V.Sanchez-Tembleque, C.Schmitt, P.-A.Soderstrom, C.Surder, G.Tocabens, V.Vedia, D.Verney, N.Warr, B.Wasilewska, J.Wiederhold, M.Yavahchova, S.Ziliani

Examination of how properties of a fissioning system impact isomeric yield ratios of the fragments

doi: 10.1103/PhysRevC.108.064602
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2023TH05      Eur.Phys.J. A 59, 153 (2023)

D.Thisse, M.Lebois, D.Verney, J.N.Wilson, N.Jovancevic, M.Rudigier, R.Canavan, D.Etasse, P.Adsley, A.Algora, M.Babo, K.Belvedere, J.Benito, G.Benzoni, A.Blazhev, A.Boso, S.Bottoni, M.Bunce, R.Chakma, N.Cieplicka-Orynczak, S.Courtin, M.L.Cortes, P.Davies, C.Delafosse, M.Fallot, B.Fornal, L.Fraile, D.Gjestvang, A.Gottardo, V.Guadilla, R.-B.Gerst, G.Hafner, K.Hauschild, M.Heine, C.Henrich, I.Homm, J.Hommet, F.Ibrahim, L.W.Iskra, P.Ivanov, S.Jazrawi, A.Korgul, P.Koseoglou, T.Kroll, T.Kurtukian-Nieto, L.Le Meur, S.Leoni, J.Ljungvall, A.Lopez-Martens, R.Lozeva, I.Matea, K.Miernik, J.Nemer, S.Oberstedt, W.Paulsen, M.Piersa-Silkowska, W.Poklepa, Y.Popovitch, C.Porzio, L.Qi, D.Ralet, P.H.Regan, D.Reygadas Tello, K.Rezynkina, V.Sanchez-Tembleque, S.Siem, C.Schmitt, P.-A.Soderstrom, K.Solak, C.Surder, G.Tocabens, V.Vedia, N.Warr, B.Wasilewska, J.Wiederhold, M.Yavahchova, F.Zeiser, S.Ziliani

Study of N = 50 gap evolution around Z = 32: new structure information for ⁸²Ge

NUCLEAR REACTIONS ²³²Th(n, F)⁸⁴Se/⁸²Ge, E fast; measured reaction products, Eγ, Iγ; deduced γ-ray energies and intensities, J, π, partial level scheme. Comparison with available data. LICORNE directional neutron source at the ALTO facility of IJCLab.

doi: 10.1140/epja/s10050-023-01051-2
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2022DA06      Phys.Rev. C 105, L031304 (2022)

B.Das, B.Cederwall, C.Qi, M.Gorska, P.H.Regan, O.Aktas, H.M.Albers, A.Banerjee, M.M.R.Chishti, J.Gerl, N.Hubbard, S.Jazrawi, J.Jolie, A.K.Mistry, M.Polettini, A.Yaneva, S.Alhomaidhi, J.Zhao, T.Arici, S.Bagchi, G.Benzoni, P.Boutachkov, T.Davinson, T.Dickel, E.Haettner, O.Hall, Ch.Hornung, J.P.Hucka, P.R.John, I.Kojouharov, R.Knobel, D.Kostyleva, N.Kuzminchuk, I.Mukha, W.R.Plass, B.S.Nara Singh, J.Vasiljevic, S.Pietri, Zs.Podolyak, M.Rudigier, H.Rosch, E.Sahin, H.Schaffner, C.Scheidenberger, F.Schirru, A.Sharma, R.Shearman, Y.Tanaka, J.Vesic, H.Weick, H.J.Wollersheim, U.Ahmed, A.Algora, C.Appleton, J.Benito, A.Blazhev, A.Bracco, A.M.Bruce, M.Brunet, R.Canavan, A.Esmaylzadeh, L.M.Fraile, G.Hafner, H.Heggen, D.Kahl, V.Karayonchev, R.Kern, A.Korgul, G.Kosir, N.Kurz, R.Lozeva, M.Mikolajczuk, P.Napiralla, R.Page, C.M.Petrache, N.Pietralla, J.-M.Regis, P.Ruotsalainen, L.Sexton, V.Sanchez-Temble, M.Si, J.Vilhena, V.Werner, J.Wiederhold, W.Witt, P.J.Woods, G.Zimba

Nature of seniority symmetry breaking in the semimagic nucleus ⁹⁴Ru

RADIOACTIVITY ^95mPd(β⁺p)[from ⁹Be(¹²⁴Xe, F), E=850 MeV/nucleon];measured Eγ, Iγ, Ep, Ip, γγ-coin, pγ-coin. ⁹⁴Ru; deduced T_1/2 of low-lying excited states, B(E2). Comparison to shell-model calculations. Ions were separated with FRS at GSI and implanted in the Advanced Implantation Detector Array (AIDA), composed of three double-sided silicon strip detectors (DSSSDs) situated at the center of the DEcay SPECtroscopy (DESPEC) setup, comprised of a hybrid array of six triple cluster high-purity germanium (HPGe) detectors and 36 LaBr3(Ce) detectors of the FAst TIMing Array (FATIMA).

doi: 10.1103/PhysRevC.105.L031304
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2021HA13      Phys.Rev. C 103, 034317 (2021)

G.Hafner, R.Lozeva, H.Naidja, M.Lebois, N.Jovancevic, D.Thisse, D.Etasse, R.L.Canavan, M.Rudigier, J.N.Wilson, E.Adamska, P.Adsley, M.Babo, K.Belvedere, J.Benito, G.Benzoni, A.Blazhev, A.Boso, S.Bottoni, M.Bunce, R.Chakma, N.Cieplicka-Orynczak, S.M.Collins, M.L.Cortes, P.J.Davies, C.Delafosse, M.Fallot, B.Fornal, L.M.Fraile, R.-B.Gerst, D.Gjestvang, V.Guadilla, K.Hauschild, C.Henrich, I.Homm, F.Ibrahim, L.W.Iskra, S.Jazwari, J.Jolie, A.Korgul, P.Koseoglou, Th.Kroll, T.Kurtukian-Nieto, L.Le-meur, J.Ljungvall, A.Lopez-Martens, I.Matea, L.Matthieu, K.Miernik, J.Nemer, S.Oberstedt, W.Paulsen, M.Piersa, Y.Popovitch, C.Porzio, L.Qi, D.Ralet, P.H.Regan, D.Reygadas Tello, K.Rezynkina, V.Sanchez, C.Schmitt, P.-A.Soderstrom, C.Surder, G.Tocabens, V.Vedia, D.Verney, N.Warr, B.Wasilewska, J.Wiederhold, M.S.Yavahchova, F.Zeiser, S.Ziliani

Spectroscopy and lifetime measurements in ^{134, 136, 138}Te isotopes and implications for the nuclear structure beyond N = 82

NUCLEAR REACTIONS ²³⁸U(n, F)¹³⁴Te/¹³⁶Te/¹³⁸Te, E AP 1.7 MeV; measured Eγ, Iγ, γγ-coin, half-lives of first 2+, 4+ and 6+ states in ^134,136,138Te and (12+) isomer in ¹³⁴Te by γγ(t) fast timing technique using HPGe and LaBr₃(Ce) detectors at the ALTO facility of IJCLab with the LICORNE neutron source and the hybrid ν-ball spectrometer. ^134,136,138Te; deduced levels, J, π, B(E2), mixed symmetry state, configurations. Comparison with previous measurements, and with state-of-the-art shell-model calculations.

NUCLEAR STRUCTURE ^134,136,138Te; calculated levels, J, π for ^136,138Te, decomposition of the wave functions for several yrast states in all three nuclides. Large-scale shell-model calculations. Comparison with experimental data.

doi: 10.1103/PhysRevC.103.034317
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2021HA28      Phys.Rev. C 104, 014316 (2021)

G.Hafner, R.Lozeva, H.Naidja, M.Lebois, N.Jovancevic, D.Thisse, D.Etasse, R.L.Canavan, M.Rudigier, J.N.Wilson, E.Adamska, P.Adsley, A.Algora, M.Babo, K.Belvedere, J.Benito, G.Benzoni, A.Blazhev, A.Boso, S.Bottoni, M.Bunce, R.Chakma, N.Cieplicka-Orynczak, S.M.Collins, M.L.Cortes, P.J.Davies, C.Delafosse, M.Fallot, L.M.Fraile, R.-B.Gerst, D.Gjestvang, V.Guadilla, K.Hauschild, C.Henrich, I.Homm, F.Ibrahim, L.W.Iskra, S.Jazwari, A.Korgul, P.Koseoglou, Th.Kroll, T.Kurtukian-Nieto, L.Le-meur, S.Leoni, J.Ljungvall, A.Lopez-Martens, L.Matthieu, K.Miernik, J.Nemer, S.Oberstedt, W.Paulsen, M.Piersa-Silkowska, Y.Popovitch, C.Porzio, L.Qi, D.Ralet, P.H.Regan, D.Reygadas Tello, K.Rezynkina, V.Sanchez-Tembleque, C.Schmitt, P.-A.Soderstrom, C.Surder, G.Tocabens, V.Vedia, D.Verney, N.Warr, B.Wasilewska, J.Wiederhold, M.S.Yavahchova, F.Zeiser, S.Ziliani

First lifetime investigations of N ≥ 82 iodine isotopes: The quest for collectivity

NUCLEAR REACTIONS ²³⁸U(n, F)¹³⁵I/¹³⁷I/¹³⁹I, E ∼ 1.7 MeV from LICORNE neutron source at the ALTO facility of IJCLab; measured Eγ, Iγ, γγ-coin, level T_1/2 by γγ(t) using ν-ball spectrometer of HPGe and LaBr₃(Ce) detectors. ^135,137,139I; deduced high-spin levels, J, π, B(E2), B(M1), B(E3), configurations; calculated occupations for the most prominent proton or neutron-proton configurations. Comparison with previous experimental data, and with large scale shell-model (LSSM) calculations using N3LOP (SM-I) and Kuo-Herling (SM-II) effective interactions. Systematics of B(E2) for yrast states of ^134,136,138Te and ^135,137,139I.

doi: 10.1103/PhysRevC.104.014316
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2021ID01      Phys.Rev. C 103, 054302 (2021)

K.E.Ide, T.Beck, V.Werner, M.Berger, S.W.Finch, U.Friman-Gayer, J.Kleemann, Krishichayan, B.Loher, O.Papst, N.Pietralla, D.Savran, W.Tornow, M.Weinert, J.Wiederhold, A.Zilges

E2 decay characteristics of the M1 scissors mode of ¹⁵²Sm

NUCLEAR REACTIONS ¹⁵²Sm(polarized γ, γ'), E=3 MeV; measured Eγ, Iγ, γ(polarization azimuthal asymmetry) by nuclear resonance fluorescence (NRF) method using four HPGe detectors at the HIγS facility at TUNL. ¹⁵²Sm; deduced levels, J, π, B(M1), B(E1), γ-branching ratios to the ground state and the first 2+ state, E2/M1 multipole mixing ratios, B(E2), summed scissors mode B(M1). Comparison with predictions of interacting boson model-2 (IBM-2); predicted energy and transition strength of the 2+ mixed-symmetry state.

doi: 10.1103/PhysRevC.103.054302
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2021WI12      Nature(London) 590, 566 (2021)

J.N.Wilson, D.Thisse, M.Lebois, N.Jovancevic, D.Gjestvang, R.Canavan, M.Rudigier, D.Etasse, R.-B.Gerst, L.Gaudefroy, E.Adamska, P.Adsley, A.Algora, M.Babo, K.Belvedere, J.Benito, G.Benzoni, A.Blazhev, A.Boso, S.Bottoni, M.Bunce, R.Chakma, N.Cieplicka-Orynczak, S.Courtin, M.L.Cortes, P.Davies, C.Delafosse, M.Fallot, B.Fornal, L.Fraile, A.Gottardo, V.Guadilla, G.Hafner, K.Hauschild, M.Heine, C.Henrich, I.Homm, F.Ibrahim, L.W.Iskra, P.Ivanov, S.Jazrawi, A.Korgul, P.Koseoglou, T.Kroll, T.Kurtukian-Nieto, L.Le Meur, S.Leoni, J.Ljungvall, A.Lopez-Martens, R.Lozeva, I.Matea, K.Miernik, J.Nemer, S.Oberstedt, W.Paulsen, M.Piersa, Y.Popovitch, C.Porzio, L.Qi, D.Ralet, P.H.Regan, K.Rezynkina, V.Sanchez-Tembleque, S.Siem, C.Schmitt, P.-A.Suderstrom, C.Surder, G.Tocabens, V.Vedia, D.Verney, N.Warr, B.Wasilewska, J.Wiederhold, M.Yavahchova, F.Zeiser, S.Ziliani

Angular momentum generation in nuclear fission

NUCLEAR REACTIONS ²³²Th(n, F), E ∼ 1.9 MeV; measured reaction products, Eγ, Iγ. ^82,84Ge, ^84,86,88Se, ^88,90,92,94Kr, ^92,94,96,98Sr, ^98,100Zr, ^130,132Sn, ^{132,134,136,138}Te, ^138,140,142Xe, ^142,144,146Ba, ^148,150Ce; deduced average J, 0+ side-feeding, fission yields, the intensity ratio of the transition from the first excited state to the ground state, and the transition(s) feeding the first excited state, dependence of average spin on fragment mass. Comparison with statistical theory, ²³³Th.

NUCLEAR REACTIONS ²³⁸U(n, F), E ∼ 1.9 MeV; measured reaction products, Eγ, Iγ. ⁸²Ge, ^84,86,88Se, ^88,90,92,94Kr, ^94,96,98Sr, ^{98,100,102,104}Zr, ^102,104Mo, ^130,132,134Sn, ^{132,134,136,138}Te, ^138,140,142Xe, ^{142,144,146,148}Ba, ^148,150Ce; deduced average J, 0+ side-feeding, fission yields, the intensity ratio of the transition from the first excited state to the ground state, and the transition(s) feeding the first excited state, dependence of average spin on fragment mass. Comparison with statistical theory, ²³⁹U.

RADIOACTIVITY ²⁵²Cf(SF); measured decay products, Eγ, Iγ, TOF. ^94,96,98Sr, ^{98,100,102,104}Zr, ^{102,104,106,108}Mo, ^108,110,112Ru, ^112,114,116Pd, ^130,132Sn, ^134,136Te, ^138,140,142Xe, ^142,144,146Ba, ^148,150Ce, ^152,154Nd; deduced average J, 0+ side-feeding, fission yields, dependence of average spin on fragment mass. Comparison with statistical theory.

doi: 10.1038/s41586-021-03304-w
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2020GE11      Phys.Rev. C 102, 064323 (2020)

R.-B.Gerst, A.Blazhev, N.Warr, J.N.Wilson, M.Lebois, N.Jovancevic, D.Thisse, R.Canavan, M.Rudigier, D.Etasse, E.Adamska, P.Adsley, A.Algora, M.Babo, K.Belvedere, J.Benito, G.Benzoni, A.Boso, S.Bottoni, M.Bunce, R.Chakma, N.Cieplicka-Orynczak, S.Courtin, M.L.Cortes, P.Davies, C.Delafosse, M.Fallot, B.Fornal, L.M.Fraile, D.Gjestvang, A.Gottardo, V.Guadilla, G.Hafner, K.Hauschild, M.Heine, C.Henrich, I.Homm, F.Ibrahim, L.W.Iskra, P.Ivanov, S.Jazrawi, A.Korgul, P.Koseoglou, T.Kroll, T.Kurtukian-Nieto, L.Le Meur, S.Leoni, J.Ljungvall, A.Lopez-Martens, R.Lozeva, I.Matea, K.Miernik, J.Nemer, S.Oberstedt, W.Paulsen, M.Piersa, Y.Popovitch, C.Porzio, L.Qi, D.Ralet, P.H.Regan, D.Reygadas Tello, K.Rezynkina, V.Sanchez-Tembleque, C.Schmitt, P.-A.Soderstrom, C.Surder, G.Tocabens, V.Vedia, D.Verney, B.Wasilewska, J.Wiederhold, M.Yavachova, F.Zeiser, S.Ziliani

Prompt and delayed γ spectroscopy of neutron-rich ⁹⁴Kr and observation of a new isomer

NUCLEAR REACTIONS ²³⁸U(n, F), E=fast neutrons from ¹H(⁷Li, ⁷Be)n, E=16 MeV; measured prompt and delayed Eγ, Iγ, γγ-coin, half-life of a new isomer in ⁹⁴Kr using the ν-Ball array of 24 HPGe Clover detectors, 10 coaxial HPGe detectors, all with BGO Compton shielding, and 20 LaBr₃ detectors at the ALTO facility of IPN-Orsay. ⁹⁴Kr; deduced levels, J, π, isomer, B(E1), B(E2), ground-state band up to 10+, two-quasiparticle neutron state for the isomer consistent with Gogny CHFB calculations. Comparison with level schemes of ⁹²Se and ⁹⁶Sr.

doi: 10.1103/PhysRevC.102.064323
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2020KE07      Phys.Rev. C 102, 041304 (2020)

R.Kern, R.Zidarova, N.Pietralla, G.Rainovski, R.Stegmann, A.Blazhev, A.Boukhari, J.Cederkall, J.G.Cubiss, M.Djongolov, C.Fransen, L.P.Gaffney, K.Gladnishki, E.Giannopoulos, H.Hess, J.Jolie, V.Karayonchev, L.Kaya, J.M.Keatings, D.Kocheva, Th.Kroll, O.Moller, G.G.O'Neill, J.Pakarinen, P.Reiter, D.Rosiak, M.Scheck, J.Snall, P.-A.Soderstrom, P.Spagnoletti, M.Stoyanova, S.Thiel, A.Vogt, N.Warr, A.Welker, V.Werner, J.Wiederhold, H.De Witte

Restoring the valence-shell stabilization in ¹⁴⁰Nd

NUCLEAR REACTIONS ²⁰⁸Pb(¹⁴⁰Nd, ¹⁴⁰Nd'), E=4.62 MeV/nucleon, [¹⁴⁰Nd beam from Ta(p, X), E=1.4 GeV at HIE-ISOLDE-CERN, and isotopic selection by RILIS and REXEBIS]; measured Eγ, Iγ, scattered particles, (particle)γ- and (particle)γγ-coin using Miniball array and double-sided silicon strip detector (DSSD). ¹⁴⁰Nd; deduced levels, J, π, Coulomb excitation cross sections, B(E2), B(E3), B(M1) by analyzing data using multistep Coulomb-excitation least-squares fitting code GOSIA, identification of the third 2+ state as the main fragment of the one-quadrupole-phonon proton-neutron mixed-symmetry state, and degree of F-spin mixing. Systematics of B(M1) strengths for N=80 isotones of ¹³²Te, ¹³⁴Xe, ¹³⁶Ba, ¹³⁸Ce and ¹⁴⁰Nd, and compared with theoretical predictions.

doi: 10.1103/PhysRevC.102.041304
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2020SI13      Phys.Rev. C 102, 014318 (2020)

M.Siciliano, I.Zanon, A.Goasduff, P.R.John, T.R.Rodriguez, S.Peru, I.Deloncle, J.Libert, M.Zielinska, D.Ashad, D.Bazzacco, G.Benzoni, B.Birkenbach, A.Boso, T.Braunroth, M.Cicerchia, N.Cieplicka-Orynczak, G.Colucci, F.Davide, G.de Angelis, B.de Canditiis, A.Gadea, L.P.Gaffney, F.Galtarossa, A.Gozzelino, K.Hadynska-Klek, G.Jaworski, P.Koseoglou, S.M.Lenzi, B.Melon, R.Menegazzo, D.Mengoni, A.Nannini, D.R.Napoli, J.Pakarinen, D.Quero, P.Rath, F.Recchia, M.Rocchini, D.Testov, J.J.Valiente-Dobon, A.Vogt, J.Wiederhold, W.Witt

Shape coexistence in neutron-deficient ¹⁸⁸Hg investigated via lifetime measurements

NUCLEAR REACTIONS ¹⁵⁸Gd(³⁴S, 4n), E=165 MeV; ¹⁶⁰Gd(³⁴S, 6n), E=185 MeV; measured Eγ, Iγ, γγ-coin, level half-lives by recoil-distance Doppler-shift (RDDS) method using the GALILEO γ-ray spectrometer, Neutron Wall array, and GALILEO plunger device at the INFN-LNL facility. ¹⁸⁸Hg; deduced levels, J, π, B(E2), transition quadrupole moments, β₂, shape coexistence, and deformations for normal and intruder configurations. Comparison with two-band mixing model with beyond-mean-field approaches, and with previous experimental results for level lifetimes. Systematics of levels in yrast bands in N=96-114 even-even mercury isotopes, and those of mean-square charge radii for N=96-114 even-even Hg, Pb and Po isotopes.

NUCLEAR STRUCTURE ^{180,182,184,186,188}Hg; calculated levels, J, π, rotational bands built on the first two 0+ states using the two-band mixing model, potential energy surfaces (PES) in (β₂, γ) plane, single-proton and neutron energies as function of the deformation β₂. Two state-of-the-art beyond mean-field calculations using the symmetry-conserving configuration-mixing (SCCM) approach for axial shapes and the five-dimensional collective Hamiltonian (5DCH).

doi: 10.1103/PhysRevC.102.014318
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2019JO08      Acta Phys.Pol. B50, 297 (2019)

N.Jovancevic, M.Lebois, J.N.Wilson, D.Thisse, L.Qi, I.Matea, F.Ibrahim, D.Verney, M.Babo, C.Delafosse, F.Adsley, G.Tocabens, A.Gottardo, Y.Popovitch, J.Nemer, R.Canavan, M.Rudigier, K.Belvedere, A.Boso, P.Regan, Zs.Podolyak, R.Shearman, M.Bunce, P.Inavov, S.Oberstedt, A.Lopez-Martens, K.Hauschild, J.Ljungvall, R.Chakma, R.Lozeva, P.-A.Soderstrom, A.Oberstedt, D.Etasse, D.Ralet, A.Blazhev, R.-B.Gerst, G.Hafner, N.Cieplicka-Orynczak, L.Iskra, B.Fornal, G.Benzoni, S.Leoni, S.Bottoni, C.Henrich, P.Koseoglou, J.Wiederhold, I.Homm, C.Surder, T.Kroll, D.Knezevic, A.Dragic, L.Cortes, N.Warr, K.Miernik, E.Adamska, M.Piersa, K.Rezynkina, L.Fraile, J.Benito Garcia, V.Sanchez, A.Algora, P.Davies, V.Guadilla-Gomez, M.Fallot, T.Kurtukian-Nieto, C.Schmitt, M.Heine, D.Reygadas Tello, M.Yavachova, M.Diakaki, F.Zeiser, W.Paulson, D.Gestvang

Spectroscopy of Neutron Induced Reactions with the ν-ball Spectrometer

doi: 10.5506/aphyspolb.50.297
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2019ST13      Phys.Rev. C 100, 064304 (2019)

M.Stoyanova, G.Rainovski, J.Jolie, N.Pietralla, A.Blazhev, M.Beckers, A.Dewald, M.Djongolov, A.Esmaylzadeh, C.Fransen, L.M.Gerhard, K.A.Gladnishki, S.Herb, P.R.John, V.Karayonchev, J.M.Keatings, R.Kern, L.Knafla, D.Kocheva, L.Kornwebel, Th.Kroll, M.Ley, K.M.Mashtakov, C.Muller-Gatermann, J.-M.Regis, M.Scheck, K.Schomacker, J.Sinclair, P.Spagnoletti, C.Surder, N.Warr, V.Werner, J.Wiederhold

Lifetimes of the 4⁺₁ states of ²⁰⁶Po and ²⁰⁴Po: A study of the transition from noncollective seniority-like mode to collectivity

NUCLEAR REACTIONS ¹⁹⁷Au(¹¹B, 4n)²⁰⁴Po, E=55 MeV; ¹⁹⁸Pt(¹²C, 4n)²⁰⁶Po, E=65 MeV; measured Eγ, Iγ, γγ-coin, level half-lives by γγ(t) fast timing technique using the HORUS spectrometer of the FN Tandem facility at the University of Cologne. ^204,206Po; deduced levels, J, π, B(E2) for the first 4+ states in both the isotopes, and for the first 2+ in ²⁰⁴Po, configurations; discussed transition from single-particle seniority like mode to collective mode. Comparison with two-state mixing calculations. Systematics of energies, R_4/2 ratios, B(E2) and magnetic moments for the yrast levels in ^{200,202,204,206,208,210}Po.

doi: 10.1103/PhysRevC.100.064304
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2019WI02      Phys.Rev. C 99, 024316 (2019)

J.Wiederhold, V.Werner, R.Kern, N.Pietralla, D.Bucurescu, R.Carroll, N.Cooper, T.Daniel, D.Filipescu, N.Florea, R-B.Gerst, D.Ghita, L.Gurgi, J.Jolie, R.S.Ilieva, R.Lica, N.Marginean, R.Marginean, C.Mihai, I.O.Mitu, F.Naqvi, C.Nita, M.Rudigier, S.Stegemann, S.Pascu, P.H.Regan

Evolution of E2 strength in the rare-earth isotopes ^{174, 176, 178, 180}Hf

NUCLEAR REACTIONS ¹⁸⁰Hf(¹⁶O, ¹⁶O), E=55 MeV; measured Eγ, Iγ, γγ-coin, half-lives of first 2+, 4+ and 6+ states by fast-timing γγ-coin using the ROSPHERE detector array for γ detection at the Bucharest FN Tandem accelerator. ¹⁸⁰Hf; deduced levels, B(E2) values and B(E2) ratios. Comparison with literature values.

RADIOACTIVITY ^174,176,178Ta(EC), (β⁺)[from ¹⁷¹Yb(⁶Li, 3n), ^172,173Yb(⁷Li, 3n), E=30 MeV]; measured Eγ, Iγ, γγ-coin, half-lives of first 2+, 4+, 6+ states, and first 2- and 3- states in ¹⁷⁶Hf by fast-timing γγ-coin using the ROSPHERE detector array for γ detection at the Bucharest FN Tandem accelerator. ^174,176,178Hf; deduced levels, B(E2) for ^174,176,178Hf, and B(E1), B(M2), B(E3) for ¹⁷⁶Hf. Systematics of g factors and B(E2) of first excited 2+ states, β₄ deformation parameters in ^{156,158,160,162,164,166,168,170}Er, ^{158,160,162,164,166,168,170,172,174,176}Yb, ^{162,164,166,168,170,172,174,176,178,180}Hf, ^{168,170,172,174,180,182,184,186}W, ^{178,180,182,184}Os. Comparison with values obtained in the rigid rotor limit and in the vibrator limit.

doi: 10.1103/PhysRevC.99.024316
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2016WI08      Phys.Rev. C 94, 044302 (2016)

J.Wiederhold, R.Kern, C.Lizarazo, N.Pietralla, V.Werner, R.V.Jolos, D.Bucurescu, N.Florea, D.Ghita, T.Glodariu, R.Lica, N.Marginean, R.Marginean, C.Mihai, R.Mihai, I.O.Mitu, A.Negret, C.Nita, A.Olacel, S.Pascu, L.Stroe, S.Toma, A.Turturica

Fast-timing lifetime measurement of ¹⁵²Gd

NUCLEAR REACTIONS ¹⁴⁹Sm(α, n), E=17.5 MeV; measured Eγ, γγ-coin, level half-lives by γγ(t) fast timing technique (FEST) at NIPNE-Bucharest Tandem accelerator facility. ¹⁵²Gd; deduced levels, B(E2), E0 transition strength for excited 0+ state to the ground state, indication of a quantum phase transition (QPT). Comparison with previous experimental results. Systematics of B(E2) products and E0 strength for ^{146,148,150,152,154,156,158}Gd, ^{148,150,152,154}Sm.

RADIOACTIVITY ¹⁵²Eu(β^-), (EC); measured Eγ, level half-lives by γγ(t) fast-timing technique. ¹⁵²Gd, ¹⁵²Sm; deduced levels, B(E2).

doi: 10.1103/PhysRevC.94.044302
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