Shell-model study of the highly forbidden beta decay 48Ca → 48Sc
Abstract
Ordinary β- decay of the 0+ ground state of 48Ca is studied. Partial half-lives for the highly-forbidden transitions to the three lowest-lying states (6+,5+,4+) of 48Sc are calculated by using both the harmonic oscillator and the Woods-Saxon mean-field wave functions. We find the decay to be dominated, as expected, by the unique fourth-forbidden transition to the excited 5+ state of 48Sc. The theoretical beta-decay half-life of 48Ca is found to be 1.1-0.6+0.8·1021 years which is approximately 25 times longer than the measured double-beta-decay half-life of T1/22ν = (4.3-1.1+2.4[stat] ± 1.4[syst])·1019 years.
- Publication:
-
EPL (Europhysics Letters)
- Pub Date:
- June 1999
- DOI:
- 10.1209/epl/i1999-00301-2
- Bibcode:
- 1999EL.....46..577A
- Keywords:
-
- 21.60.Cs;
- 23.40.-s;
- 23.40.Hc;
- Shell model;
- Beta decay;
- double beta decay;
- electron and muon capture;
- Relation with nuclear matrix elements and nuclear structure