Impact of New Gamow-Teller Strengths on Explosive Type Ia Supernova Nucleosynthesis
Abstract
Recent experimental results have confirmed a possible reduction in the GT strengths of pf-shell nuclei. These proton-rich nuclei are of relevance in the deflagration and explosive burning phases of Type Ia supernovae. While prior GT strengths result in nucleosynthesis predictions with a lower-than-expected electron fraction, a reduction in the GT strength can result in an slightly increased electron fraction compared to previous shell model predictions, though the enhancement is not as large as previous enhancements in going from rates computed by Fuller, Fowler, and Newman based on an independent particle model. A shell model parametrization has been developed which more closely matches experimental GT strengths. The resultant electron-capture rates are used in nucleosynthesis calculations for carbon deflagration and explosion phases of Type Ia supernovae, and the final mass fractions are compared to those obtained using more commonly-used rates.
Keywords
Cite
@article{arxiv.1610.05752,
title = {Impact of New Gamow-Teller Strengths on Explosive Type Ia Supernova Nucleosynthesis},
author = {Kanji Mori and Michael A. Famiano and Toshitaka Kajino and Toshio Suzuki and Jun Hidaka and Michio Honma and Koichi Iwamoto and Ken'ichi Nomoto and Takaharu Otsuka},
journal= {arXiv preprint arXiv:1610.05752},
year = {2016}
}
Comments
Accepted for publication in Astrophysical Journal