NDLI: Weak-interaction-mediated rates on iron isotopes for presupernova evolution of massive stars

Content Provider	Springer Nature Link
Author	Nabi, J. Un
Copyright Year	2009
Abstract	During the presupernova evolution of massive stars, the isotopes of iron, 54, 55, 56Fe , are advocated to play a key role inside the cores primarily decreasing the electron-to-baryon ratio (Ye) mainly via electron capture processes thereby reducing the pressure support. Electron decay and positron capture on 55Fe , on the other hand, also have a consequential role in increasing the lepton ratio during the silicon burning phases of massive stars. The neutrinos and antineutrinos produced, as a result of these weak-interaction reactions, are transparent to the stellar matter and assist in cooling the core thereby reducing the entropy. The structure of the presupernova star is altered both by the changes in Ye and the entropy of the core material. The aim of this paper is to report the improved microscopic calculation of Gamow-Teller (GT±) strength distributions of these key isotopes of iron using the pn-QRPA theory. The main improvement comes from the incorporation of experimental deformation values for these nuclei. Additionally six different weak-interaction rates, namely electron and positron capture, electron and positron decay, and, neutrino and antineutrino cooling rates, were also calculated in presupernova matter. The calculated electron capture and neutrino cooling rates due to isotopes of iron are in good agreement with the large-scale shell model (LSSM) results. The calculated beta decay rates, however, are suppressed by three to five orders of magnitude.
Starting Page	223
Ending Page	230
Page Count	8
File Format	PDF
ISSN	14346001
Journal	The European Physical Journal A - Hadrons and Nuclei
Volume Number	40
Issue Number	2
e-ISSN	1434601X
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-04-14
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nuclear Fusion Elementary Particles and Nuclei Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics

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