Shell effects in hot nuclei and their influence on nuclear composition in supernova matter

Suguru Nishimura, Masatoshi Takano

研究成果: Conference contribution

4 被引用数 (Scopus)

抄録

We calculate nuclear composition in supernova (SN) matter explicitly taking into account the temperature dependence of nuclear shell effects. The abundance of nuclei in SN matter is important in the dynamics of core-collapse supernovae and, in recently constructed equations of state (EOS) for SN matter, the composition of nuclei are calculated assuming nuclear statistical equilibrium wherein the nuclear internal free energies govern the composition. However, in these EOS, thermal effects on the shell energy are not explicitly taken into account. To address this shortfall, we calculate herein the shell energies of hot nuclei and examine their influence on the composition of SN matter. Following a simplified macroscopic-microscopic approach, we first calculate single-particle (SP) energies by using a spherical Woods-Saxon potential. Then we extract shell energies at finite temperatures using Strutinsky method with the Fermi distribution as the average occupation probability of the SP levels. The results show that at relatively low temperatures, shell effects are still important and magic nuclei are abundant. However, at temperatures above approximately 2 MeV, shell effects are almost negligible, and the mass fractions with shell energies including the thermal effect are close to those obtained from a simple liquid drop model at finite temperatures.

本文言語English
ホスト出版物のタイトルOrigin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
出版社American Institute of Physics Inc.
ページ239-244
ページ数6
ISBN(印刷版)9780735412286
DOI
出版ステータスPublished - 2014
イベント12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 - Tsukuba, Japan
継続期間: 2013 11月 182013 11月 21

出版物シリーズ

名前AIP Conference Proceedings
1594
ISSN(印刷版)0094-243X
ISSN(電子版)1551-7616

Conference

Conference12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
国/地域Japan
CityTsukuba
Period13/11/1813/11/21

ASJC Scopus subject areas

  • 生態、進化、行動および分類学
  • 生態学
  • 植物科学
  • 物理学および天文学(全般)
  • 自然保全および景観保全

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