Shell-model study of the highly forbidden beta decay 48 Ca → 48 Sc
1999; Institute of Physics; Volume: 46; Issue: 5 Linguagem: Inglês
10.1209/epl/i1999-00301-2
ISSN1286-4854
AutoresM. Aunola, J. Suhonen, T. Siiskonen,
Tópico(s)Quantum Chromodynamics and Particle Interactions
ResumoOrdinary 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.
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