Beta decay of Neutron-Rich 53-56Ca
/ Authors
P. Mantica, R. Broda, H. Crawford, A. Damaske, B. Fornal, A. Hecht, C. Hoffman, M. Horoi, N. Hoteling, R. Janssens
and 8 more authors
J. Pereira, J. Pinter, J. Stoker, S. Tabor, T. Sumikama, W. Walters, Xiaofeng Wang, S. Zhu
/ 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.
Journal: Physical Review C