Shell model calculation of the beta- and beta+ partial halflifes of 54Mn and other unique second forbidden beta decays

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dc.creatorMartinez-Pinedo, Gabriel
dc.creatorVogel, Petr
dc.date1998-03-11
dc.date.accessioned2026-07-07T12:33:18Z
dc.date.available2026-07-07T12:33:18Z
dc.descriptionThe nucleus 54Mn has been observed in cosmic rays. In astrophysical environments it is fully stripped of its atomic electrons and its decay is dominated by the beta- branch to the 54Fe ground state. Application of 54Mn based chronometer to study the confinement of the iron group cosmic rays requires knowledge of the corresponding halflife, but its measurement is impossible at the present time. However, the branching ratio for the related beta+ decay of 54Mn was determined recently. We use the shell model with only a minimal truncation and calculate both beta+ and beta- decay rates of 54Mn. Good agreement for the beta+ branch suggests that the calculated partial halflife of the beta- decay, (4.94 \pm 0.06) x 10^5 years, should be reliable. However, this halflife is noticeably shorter than the range 1-2 x 10^6 y indicated by the fit based on the 54Mn abundance in cosmic rays. We also evaluate other known unique second forbidden beta decays from the nuclear p and sd shells (10Be, 22Na, and two decay branches of 26Al) and show that the shell model can describe them with reasonable accuracy as well.
dc.description4 pages, RevTeX, 2 figures
dc.identifierhttps://arxiv.org/abs/nucl-th/9803032
dc.identifierhttp://arxiv.org/abs/nucl-th/9803032
dc.identifierPhys.Rev.Lett.81:281-284,1998
dc.identifierdoi:10.1103/PhysRevLett.81.281
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/217082
dc.subjectNuclear Theory
dc.subjectAstrophysics
dc.titleShell model calculation of the beta- and beta+ partial halflifes of 54Mn and other unique second forbidden beta decays
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