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

Suguru Nishimura, Masatoshi Takano

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Title of host publicationOrigin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013
PublisherAmerican Institute of Physics Inc.
Pages239-244
Number of pages6
ISBN (Print)9780735412286
DOIs
Publication statusPublished - 2014 Jan 1
Event12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 - Tsukuba, Japan
Duration: 2013 Nov 182013 Nov 21

Publication series

NameAIP Conference Proceedings
Volume1594
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

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

Keywords

  • Strutinsky method
  • equation of state
  • nuclear statistical equilibrium
  • shell effects
  • supernova

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology
  • Plant Science
  • Physics and Astronomy(all)
  • Nature and Landscape Conservation

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  • Cite this

    Nishimura, S., & Takano, M. (2014). Shell effects in hot nuclei and their influence on nuclear composition in supernova matter. In Origin of Matter and Evolution of Galaxies 2013 - Proceedings of the 12th International Symposium on Origin of Matter and Evolution of Galaxies, OMEG 2013 (pp. 239-244). (AIP Conference Proceedings; Vol. 1594). American Institute of Physics Inc.. https://doi.org/10.1063/1.4874076