Competition of electron capture and beta-decay rates in supernova collapse

Citation
G. Martinez-pinedo et al., Competition of electron capture and beta-decay rates in supernova collapse, ASTROPH J S, 126(2), 2000, pp. 493-499
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
ISSN journal
0067-0049 → ACNP
Volume
126
Issue
2
Year of publication
2000
Pages
493 - 499
Database
ISI
SICI code
0067-0049(200002)126:2<493:COECAB>2.0.ZU;2-#
Abstract
We calculate supernova electron capture and beta-decay rates for various pf -shell nuclei using large-scale shell-model techniques. We show that the ce ntroid of the Gamow-Teller strength distribution was systematically misplac ed in previous rate estimates. Our total electron capture rates are signifi cantly smaller than currently adopted in core collapse calculations, while the total beta-decay rates change less. Our calculation shows that for elec tron-to-baryon ratios, Y-e = 0.42-0.46, beta-decay rates are larger than th e competing electron capture rates.