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Transition probabilities in neutron-rich Se-84,Se-86
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2015 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 92, no 6, 064322Article in journal (Refereed) Published
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Abstract [en]

Reduced quadrupole transition probabilities for low-lying transitions in neutron-rich Se-84,Se-86 are investigated with a recoil distance Doppler shift (RDDS) experiment. The experiment was performed at the Istituto Nazionale di Fisica Nucleare (INFN) Laboratori Nazionali di Legnaro using the Cologne Plunger device for the RDDS technique and the AGATA Demonstrator array for the gamma-ray detection coupled to the PRISMA magnetic spectrometer for an event-by-event particle identification. In Se-86 the level lifetime of the yrast 2(1)(+) state and an upper limit for the lifetime of the 4(1)(+) state are determined for the first time. The results of Se-86 are in agreement with previously reported predictions of large-scale shell-model calculations using Ni78-I and Ni78-II effective interactions. In addition, intrinsic shape parameters of lowest yrast states in Se-86 are calculated. In semimagic Se-84 level lifetimes of the yrast 4(1)(+) and 6(1)(+) states are determined for the first time. Large-scale shell-model calculations using effective interactions Ni78-II, JUN45, jj4b, and jj4pna are performed. The calculations describe B(E2; 2(1)(+) -> 0(1)(+)) and B(E2; 6(1)(+) -> 4(1)(+)) fairly well and point out problems in reproducing the experimental B(E2; 4(1)(+) -> 2(1)(+)).

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American Physical Society , 2015. Vol. 92, no 6, 064322
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Physical Sciences
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URN: urn:nbn:se:kth:diva-180984DOI: 10.1103/PhysRevC.92.064322ISI: 000367380200001Scopus ID: 2-s2.0-84954122179OAI: oai:DiVA.org:kth-180984DiVA: diva2:898516
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QC 20160128

Available from: 2016-01-28 Created: 2016-01-26 Last updated: 2016-01-28Bibliographically approved

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CiteExportLink to record
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