論文

査読有り
2018年2月26日

Equilibrium nuclear ensembles taking into account vaporization of hot nuclei in dense stellar matter

Physical Review C
  • Shun Furusawa
  • ,
  • Igor Mishustin

97
2
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevC.97.025804
出版者・発行元
American Physical Society

We investigate the high-temperature effect on the nuclear matter that consists of mixture of nucleons and all nuclei in the dense and hot stellar environment. The individual nuclei are described within the compressible-liquid-drop model that is based on Skyrme interactions for bulk energies and that takes into account modifications of the surface and Coulomb energies at finite temperatures and densities. The free-energy density is minimized with respect to the individual equilibrium densities of all heavy nuclei and the nuclear composition. We find that their optimized equilibrium densities become smaller and smaller at high temperatures because of the increase in thermal contributions to bulk free energies and the reduction of surface energies. The neutron-rich nuclei become unstable and disappear one after another at given temperatures. The calculations are performed for two sets of model parameters leading to different values of the slope parameter in the nuclear-symmetry energy. It is found that the larger slope parameter reduces the equilibrium densities and the melting temperatures. We also compare the proposed model with some other approaches and find that the mass fractions of heavy nuclei in the previous calculations that omit vaporization are underestimated at T 10 MeV and overestimated at Tâ‰310 MeV. The further sophistication of calculations of nuclear vaporization and of light clusters would be required to construct the equation of state for explosive astrophysical phenomena.

リンク情報
DOI
https://doi.org/10.1103/PhysRevC.97.025804
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000426043700007&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevC.97.025804
  • ISSN : 2469-9993
  • ISSN : 2469-9985
  • SCOPUS ID : 85043247749
  • Web of Science ID : WOS:000426043700007

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