Physics – Nuclear Physics – Nuclear Theory
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110806a&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #108.06; Bulletin of the American Astronomical Society, Vol. 24, p.1294
Physics
Nuclear Physics
Nuclear Theory
Scientific paper
Weak interaction rates, such as electron capture and beta decay, are important in the evolution of Type II supernova progenitors because they help to set the electron fraction (Y_e) and entropy profiles of the evolving iron core. Because of these effects, such rates help to set the initial conditions for core collapse calculations. We present newly calculated electron capture and beta decay rates for several of the most important iron group nuclei which become abundant after silicon burning. These rates use shell model calculations which have been tested with recent charge-exchange experiments. We compare these new rates with the Fuller, Fowler, and Newman rates which are currently used in presupernova calculations. We discuss recent work(1) which indicates that beta decay rates can be as strong as electron capture rates in the evolution which precedes core collapse. This balancing could reset Y_e and lead to an URCA process which may significantly affect the evolution of the iron core. We discuss what the newly calculated rates indicate about such an URCA process. (1) M.B. Aufderheide, I. Fushiki, G.M. Fuller, and T.A. Weaver, to be submitted to ApJ Letters. () Work at Lawrence Livermore National Laboratory was performed under the auspices of the U.S. DoE under contract No. W-7405-ENG-48 and DoE Nuclear Theory Grant SF-ENG-48.
Aufderheide Maurice B.
Bloom Steven David
Mathews Grant J.
Resler David A.
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