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Shell Model Calculation of the β- and β+ Partial Half-Lives of 54Mn and Other Unique Second Forbidden β Decays

Martinez-Pinedo, Gabriel and Vogel, Petr (1998) Shell Model Calculation of the β- and β+ Partial Half-Lives of 54Mn and Other Unique Second Forbidden β Decays. Physical Review Letters, 81 (2). pp. 281-284. ISSN 0031-9007. http://resolver.caltech.edu/CaltechAUTHORS:MARprl98

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Abstract

The nucleus 54Mn, observed in cosmic rays, decays there dominantly by the β- branch with an unknown rate. The branching ratio of its β+ decay was determined recently. We use the shell model with only a minimal truncation and calculate both β+ and β- decay rates. Good agreement for the β+ branch suggests that the calculated partial half-life of the β- decay, 4.94×10^5 yr, should be reliable. However, this half-life is noticeably shorter than the range 1–2×10^6 yr indicated by the fit based on the 54Mn abundance in cosmic rays. We also evaluate other known unique second forbidden β decays from the p and sd shells and show that the shell model can describe them with reasonable accuracy as well.


Item Type:Article
Additional Information:©1998 The American Physical Society Received 12 March 1998 P.V. is supported in part by the U.S. Department of Energy under Grant No. DE-FG03-88ER-40397. G.M.P. is supported in part by the DGICyES (Spain). Computational resources were provided by the Center for Advanced Computational Research at Caltech.
Record Number:CaltechAUTHORS:MARprl98
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:MARprl98
Alternative URL:http://dx.doi.org/10.1103/PhysRevLett.81.281
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2789
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:27 Apr 2006
Last Modified:18 Sep 2014 18:11

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