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β decay of neutron-rich Ca53-56

P. F. Mantica) Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , USA (R. BrodaPolish Academy of SciencesH. L. Crawford( ) National Superconducting Cyclotron Laboratory , Michigan State University , East Lansing , Michigan 48824 , USA (A. Damaske) Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , USA (B. FornalPolish Academy of SciencesA. A. Hecht) Physics Division , Argonne National Laboratory , Argonne , Illinois 60439 , USA (C. R. Hoffman) Department of Physics and Astronomy , Florida State University , Tallahassee , Florida 32306 , USA (Mihai Horoi) Department of Physics , Central Michigan University , Mount Pleasant , Michigan 48859 , USA (N. Hoteling) Department of Chemistry and Biochemistry , University of Maryland , College Park , Maryland 20742 , USA (R. V. F. JanssensPereira, J.) Joint Institute for Nuclear Astrophysics , Michigan State University , East Lansing , Michigan 48824 , USA (J. S. Pinter( ) National Superconducting Cyclotron Laboratory , Michigan State University , East Lansing , Michigan 48824 , USA (J. Stoker) Department of Chemistry , Michigan State University , East Lansing , Michigan 48824 , USA (Tabor, S.L.) Department of Physics and Astronomy , Florida State University , Tallahassee , Florida 32306 , USA (T. SumikamaRIKEN Advanced Science InstituteW. B. Walters) Department of Physics and Astronomy , Florida State University , Tallahassee , Florida 32306 , USA (Wang, X.) Physics Division , Argonne National Laboratory , Argonne , Illinois 60439 , USA (Zhu, S.) Physics Division , Argonne National Laboratory , Argonne , Illinois 60439 , USA (

2008en

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ABI

Annotatsiya

β-decay properties of neutron-rich Ca isotopes have been obtained. Half-life values were determined for the first time for Ca54 (86±7 ms), Ca55 (22±2 ms), and Ca56 (11±2 ms). The half-life of 230±60 ms deduced for Ca53 is significantly longer than reported previously, where the decay chain K53 → Ca53 → Sc53 was considered. A delayed γ ray with an energy of 247 keV was identified following β decay of Ca54 and is proposed to depopulate the 11+ level in Sc54. The β-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 β-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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DOI: 10.17615/7qjk-pr92

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