Beta decay of Neutron-Rich 53-56Ca

Details Beta decay of Neutron-Rich 53-56Ca Beta decay of Neutron-Rich 53-56Ca

2008-01-07

arxiv.org/abs/0801.0994v1

Phys.Rev.C77:014313,2008

Physics

Nuclear Physics

Nuclear Experiment

11 figures

Scientific paper

10.1103/PhysRevC.77.014313

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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