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The role of core excitations in the structure and decay of the 16(+) spin-gap isomer in Cd-96
Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England..
GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany..
Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany.;RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan..
Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany..
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2017 (English)In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 767, 474-479 p.Article in journal (Refereed) Published
Abstract [en]

The first evidence for beta-delayed proton emission from the 16(+) spin gap isomer in Cd-96 is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. beta p branching ratios for the ground state and 16(+) isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of Cd-95. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for l = 0, 2, 4 proton emission from three resonance-like states in Ag-96, that are populated by the beta decay of the isomer, and the results compared to the new data. The calculations suggest that l = 2 proton emission from the resonance states, which reside similar to 5 MeV above the proton separation energy, dominates the proton decay. The results highlight the importance of core-excited wavefunction components for the 16(+) state.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE BV , 2017. Vol. 767, 474-479 p.
Keyword [en]
beta-decay, beta p-decay, gamma-ray spectroscopy, Half-life, Shell-model, WKB
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-320022DOI: 10.1016/j.physletb.2017.02.013ISI: 000397861700072OAI: oai:DiVA.org:uu-320022DiVA: diva2:1088629
Available from: 2017-04-13 Created: 2017-04-13 Last updated: 2017-04-13Bibliographically approved

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