Beta decay of neutron-rich {sup 53-56}Ca.

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Phys. Rev. C

DOI:https://doi.org/10.1103/PhysRevC.77.014313· OSTI ID:925382

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; RIKEN,

{beta}-decay properties of neutron-rich Ca isotopes have been obtained. Half-life values were determined for the first time for {sup 54}Ca (86{+-}7 ms), {sup 55}Ca (22{+-}2 ms), and {sup 56}Ca (11{+-}2 ms). The half-life of 230{+-}60 ms deduced for {sup 53}Ca is significantly longer than reported previously, where the decay chain {sup 53}K --> {sup 53}Ca --> {sup 53}Sc was considered. A delayed gamma ray with an energy of 247 keV was identified following {beta} decay of {sup 54}Ca and is proposed to depopulate the 1{sub 1}{sup +} level in {sup 54}Sc. 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.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 925382
• Report Number(s): ANL/PHY/JA-60673
• Journal Information: Phys. Rev. C, Journal Name: Phys. Rev. C Journal Issue: Jan. 2008 Vol. 77; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BETA DECAY
CALCIUM ISOTOPES
CHAINS
DECAY
HALF-LIFE