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Phys. Rev. C 77, 014313 (2008) [10 pages]

β decay of neutron-rich 53-56Ca

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P. F. Mantica1,2, R. Broda3, H. L. Crawford1,2, A. Damaske1,2, B. Fornal3, A. A. Hecht4,5, C. Hoffman6, M. Horoi7, N. Hoteling4,5, R. V. F. Janssens5, J. Pereira1,8, J. S. Pinter1,2, J. B. Stoker1,2, S. L. Tabor6, T. Sumikama9,*, W. B. Walters6, X. Wang5,10, and S. Zhu5
1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
2Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
3Institute of Nuclear Physics, Polish Academy of Sciences, PL-31342, Cracow, Poland
4Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
5Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
6Department of Physics and Astronomy, Florida State University, Tallahassee, Florida 32306, USA
7Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA
8Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA
9RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
10Department of Physics, University of Notre Dame, South Bend, Indiana 46556, USA

Received 29 November 2007; published 22 January 2008

β-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±60 ms deduced for 53Ca is significantly longer than reported previously, where the decay chain 53K → 53Ca → 53Sc was considered. A delayed γ ray with an energy of 247 keV was identified following β decay of 54Ca and is proposed to depopulate the 11+ level in 54Sc. 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.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.77.014313
DOI:
10.1103/PhysRevC.77.014313
PACS:
23.40.-s, 23.20.Lv, 21.60.Cs, 27.40.+z

*Present address: Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan.

 
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