https://doi.org/10.1051/epjconf/202226006004
Screening Effects on Electron-Capture Rates and Type Ia Supernova Nucleosynthesis
1 Department of Physics, College of Humanities and Sciences, Nihon University, 3-25-40 Sakurajosui, Setagaya-ku, Tokyo 156-8550, Japan
2 Research Institute of Stellar Explosive Phenomena, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka-shi, Fukuoka 814-0180, Japan
3 Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, Fukushima 965-8580, Japan
4 Department of Physics, Western Michigan University, Kalamazoo, MI 49008, USA
5 School of Physics, Beihang University, Haidian-qu, Beijing 100083, People’s Republic of China
6 Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
7 Department of Physics, University of Wisconsin-Madison, Madison, WI 53706, USA
8 National Astronomical Observatory of Japan, 2-21-2 Osawa, Mitaka, Tokyo 181-8588, Japan
* e-mail: suzuki.toshio@nihon-u.ac.jp
Published online: 24 February 2022
Nucleosynthesis of iron-group elements in Type Ia supernovae is studied for single-degenerate models with the use of electron-capture rates updated with the new shell-model Hamiltonian in pf -shell. An over-production problem of neutron-rich iron-group isotopes compared with the solar abundances is now found to be suppressed within a factor of about twice for the updated weak rates. Effects of screening on nucleosynthesis are investigated for explosion models of fast deflagration and slow deflagration with delayed detonation. The e-capture rates are reduced by the screening, especially by the screening effects on the ions. The production yields of most neutron-rich isotopes such as 50Ti, 54Cr and 58Fe are found to be suppressed most by the screening. The inclusion of the screening is desirable for precise evaluation of abundances of neutron-rich nuclides.
© The Authors, published by EDP Sciences, 2022
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