Beta decay of Neutron-Rich 53-56Ca

Authors :: Mantica, P. F.
Broda, R.
Crawford, H. L.
Damaske, A.
Fornal, B.
Hecht, A. A.
Hoffman, C.
Horoi, M.
Hoteling, N.
Janssens, R. V. F.
Pereira, J.
Pinter, J. S.
Stoker, J. B.
Tabor, S. L.
Sumikama, T.
Walters, W. B.
Wang, X.
Zhu, S.
Source :: Phys.Rev.C77:014313,2008
Publication Year :: 2008
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.<br />Comment: 11 figures

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