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NSR database version of May 10, 2024.

Search: Author = R.A.Herrera

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2022HE03      Phys.Rev. C 105, 015801 (2022)

R.A.Herrera, C.W.Johnson, G.M.Fuller

Modified Brink-Axel hypothesis for astrophysical Gamow-Teller transitions

RADIOACTIVITY ^53,55,56Fe, ⁵⁷Co(EC), ⁵⁵Cr(β^-); calculated B(GT) for ⁵³Fe to ⁵³Mn, ⁵⁵Fe to ⁵⁵Mn, ⁵⁶Fe to ⁵⁶Mn, and ⁵⁷Co to ⁵⁷Fe from two adjacent initial states with excitation energies near 4.5 MeV, running sums of the strength functions for ⁵³Fe to ⁵³Mn, and ⁵⁵Cr to ⁵⁵Mn, transition strength running sums, thermal electron capture rates, and thermal positron emission rates for ⁵⁷Co to ⁵⁷Fe. ²⁸Si(EC); calculated running sum of the strength function for ²⁸Si to ²⁸Al. Modified "local" Brink-Axel hypothesis for Gamow-Teller transitions for pf-shell nuclei in astrophysical applications. Relevance to computing accurate thermal weak transition rates for medium-mass nuclei at temperatures occurring in stellar cores near collapse stage.

doi: 10.1103/PhysRevC.105.015801
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2017HE06      Phys.Rev. C 95, 024303 (2017)

R.A.Herrera, C.W.Johnson

Quasidynamical symmetries in the backbending of chromium isotopes

NUCLEAR STRUCTURE ^48,49,50Cr; calculated levels, J, decomposition of wave functions into total orbital angular momentum, total spin, and SU(3) and SU(4) irreducible representations (irreps); discussed backbending and quasidynamical symmetries. Group-theoretical decomposition using configuration-interaction shell-model wave functions from total orbital angular momentum, total spin, and the two-body Casimir operators of SU(3) and SU(4) groups.

doi: 10.1103/PhysRevC.95.024303
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