Nucleosynthesis in Massive Stars Including All Stable Isotopes
Abstract
We present the first calculations to follow the evolution of all stable isotopes (and their abundant radioactive progenitors) in a finely zoned stellar model computed from the onset of central hydrogen burning through explosion as a Type II supernova. The calculations were performed for a 15 solar mass Pop I star using the most recently available set of experimental and theoretical nuclear data, revised opacity tables, and taking into account mass loss due to stellar winds. We find the approximately solar production of protonrich isotopes above a mass number of A=120 due to the gammaprocess. We also find a weak sprocess, which along with the gammaprocess and explosive helium and carbon burning, produces nearly solar abundances of almost all nuclei from A=60 to 85. A few modifications of the abundances of heavy nuclei above mass 90 by the sprocess are also noted and discussed. New weak rates lead to significant alteration of the properties of the presupernova core.
 Publication:

Nuclear Astrophysics, 2000
 Pub Date:
 2000
 arXiv:
 arXiv:astroph/0006350
 Bibcode:
 2000nuas.conf..105H
 Keywords:

 Astrophysics;
 Nuclear Theory
 EPrint:
 10 pages, 4 figures, Nuclear Astrophysics X Workshop proceedings