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Nuclear Weak Interaction Rates During Stellar Evolution and Collapse

Citation

Fuller, George Michael (1981) Nuclear Weak Interaction Rates During Stellar Evolution and Collapse. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Y2W8-MB57. https://resolver.caltech.edu/CaltechTHESIS:06052013-092608399

Abstract

Nuclear weak interaction rates, including electron and positron emission rates, and continuum electron and positron capture rates, as well as the associated ν and ⊽ energy loss rates are calculated on a detailed grid of temperature and density for the free nucleons and 226 nuclei with masses between A = 21 and 60. Gamow-Teller and Fermi discrete-state transition matrix element systematics and the Gamow-Teller T< ⇄ T> resonance transitions are discussed in depth and are implemented in the stellar rate calculations. Results of the calculations are presented on an abbreviated grid of temperature and density and comparison is made to terrestrial weak transition rates where possible. Neutron shell blocking of allowed electron capture on heavy nuclei during stellar core collapse is discussed along with several unblocking mechanisms operative at high temperature and density. The results of one-zone collapse calculations are presented which suggest that the effect of neutron shell blocking is to produce a larger core lepton fraction at neutrino trapping which leads to a larger inner-core mass and hence a stronger post-bounce shock.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Physics
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Fowler, William A.
Thesis Committee:
  • Fowler, William A. (chair)
  • Koonin, Steven E.
  • Thorne, Kip S.
  • Oke, J. Beverly
Defense Date:1 May 1981
Non-Caltech Author Email:gfuller (AT) ucsd.edu
Funders:
Funding AgencyGrant Number
Fannie and John Hertz FoundationUNSPECIFIED
Record Number:CaltechTHESIS:06052013-092608399
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:06052013-092608399
DOI:10.7907/Y2W8-MB57
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7840
Collection:CaltechTHESIS
Deposited By: John Wade
Deposited On:05 Jun 2013 16:56
Last Modified:09 May 2020 00:48

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