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arXiv · 0801.0994

Beta decay of Neutron-Rich 53-56Ca

P. F. Mantica·R. Broda·H. L. Crawford·A. Damaske·B. Fornal·A. A. Hecht·C. Hoffman·M. Horoi·N. Hoteling·R. V. F. Janssens·J. Pereira·J. S. Pinter·J. B. Stoker·S. L. Tabor·T. Sumikama·W. B. Walters·X. Wang·S. Zhu
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Abstract

Beta-decay properties of neutron-rich Ca isotopes have been obtained. Half-life values were determined for the first time for 54Ca [86(7) ms], 55Ca [22(2) ms], and 56Ca [11(2) ms]. The half-life of 230(6) ms deduced for 53Ca is significantly longer than reported previously, where the decay chain 53K -> 53Ca -> 53Sc was considered. A delayed gamma ray with energy 247 keV as identified following beta decay of 54Ca, and is proposed to depopulate the first 1+ level in 54Sc. The beta-decay properties compare favorably with the results of shell model calculations completed in the full pf-space with the GXPF1 interaction. The half-lives of the neutron-rich Ca isotopes are also compared with gross beta-decay theory. The systematic trend of the neutron-rich Ca half-lives is consistent with the presence of a subshell gap at N=32.

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P. F. Mantica, R. Broda, H. L. Crawford, A. Damaske, B. Fornal, A. A. Hecht, C. Hoffman, M. Horoi, N. Hoteling, R. V. F. Janssens, J. Pereira, J. S. Pinter, J. B. Stoker, S. L. Tabor, T. Sumikama, W. B. Walters, X. Wang, S. Zhu. 2008-01-07. Beta decay of Neutron-Rich 53-56Ca. https://doi.org/10.1103/physrevc.77.014313

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