Modified Brink-Axel hypothesis for astrophysical Gamow-Teller transitions

Herrera, Raúl A.; Johnson, Calvin W.; Fuller, George M.

doi:10.1103/physrevc.105.015801

Modified Brink-Axel hypothesis for astrophysical Gamow-Teller transitions

Journal Article · Sun Jan 02 23:00:00 EST 2022 · Physical Review. C

DOI:https://doi.org/10.1103/physrevc.105.015801· OSTI ID:1979857

^[1]; ^[2]; Fuller, George M. ^[3]

Univ. of California, San Diego, CA (United States); OSTI
San Diego State Univ., CA (United States)
Univ. of California, San Diego, CA (United States)

Weak interaction charged current transition strengths from highly excited nuclear states are fundamental ingredients for accurate modeling of compact object composition and dynamics, but are difficult to obtain either from experiment or theory. For lack of alternatives, calculations have often fallen back upon a generalized Brink-Axel hypothesis, that is, assuming the strength function (transition probability) is independent of the initial nuclear state but depends only upon the transition energy and the weak interaction properties of the parent nucleus ground state. Here we present numerical evidence for a modified “local” Brink-Axel hypothesis for Gamow-Teller transitions for pf-shell nuclei relevant to astrophysical applications. Specifically, while the original Brink-Axel hypothesis does not hold globally, strength functions from initial states nearby in energy are similar within statistical fluctuations. This agrees with previous work on strength function moments. Using this modified hypothesis, we can tackle strength functions at previously intractable initial energies, using semiconverged initial states at arbitrary excitation energy. Our work provides a well-founded method for computing accurate thermal weak transition rates for medium-mass nuclei at temperatures occurring in stellar cores near collapse. We finish by comparing results to previous calculations of astrophysical rates.

View Accepted Manuscript (DOE)

Research Organization:: San Diego State Univ., CA (United States); Oak Ridge Associated Universities (ORAU), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS); National Science Foundation (NSF); Simons Foundation

Grant/Contract Number:: FG02-03ER41272; SC0014664

OSTI ID:: 1979857

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 1 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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