skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: A new baryonic equation of state at sub-nuclear densities for core-collapse simulations

Abstract

We construct a new equation of state for baryons at sub-nuclear densities for the use in core-collapse simulations of massive stars. The formulation is based on the nuclear statistical equilibrium description and the liquid drop approximation of nuclei. The model free energy to minimize is calculated by using relativistic mean field theory for nucleons and the mass formula for nuclei with atomic number up to {approx} 1000. We have also taken into account the pasta phase. We find that the free energy and other thermodynamical quantities are not very different from those given in the standard EOSs that adopt the single nucleus approximation. On the other hand, the average mass is systematically different, which may have an important effect to the rates of electron captures and coherent neutrino scatterings on nuclei in supernova cores. It is also interesting that the root mean square of the mass number is not very different from the average mass number, since the former is important for the evaluation of coherent scattering rates on nuclei but has been unavailable so far.

Authors:
; ; ;  [1];  [2];  [3];  [3]
  1. Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 (Japan)
  2. (Japan) and Advanced Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 (Japan)
  3. (Japan)
Publication Date:
OSTI Identifier:
22075770
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1484; Journal Issue: 1; Conference: Conference on origin of matter and evolution of galaxies 2011, Wako (Japan), 14-17 Nov 2011; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; COHERENT SCATTERING; ELECTRON CAPTURE; EQUATIONS OF STATE; FREE ENERGY; LIQUID DROP MODEL; MASS FORMULAE; MEAN-FIELD THEORY; NEUTRINO REACTIONS; NEUTRINOS; NUCLEAR MATTER; NUCLEONS; RELATIVISTIC RANGE; STATISTICAL MODELS; SUPERNOVAE; THERMODYNAMICS

Citation Formats

Furusawa, Shun, Yamada, Shoichi, Sumiyoshi, Kohsuke, Suzuki, Hideyuki, Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Numazu College of Technology, Ooka 3600, Numazu, Shizuoka 410-8501, and Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510. A new baryonic equation of state at sub-nuclear densities for core-collapse simulations. United States: N. p., 2012. Web. doi:10.1063/1.4763423.
Furusawa, Shun, Yamada, Shoichi, Sumiyoshi, Kohsuke, Suzuki, Hideyuki, Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Numazu College of Technology, Ooka 3600, Numazu, Shizuoka 410-8501, & Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510. A new baryonic equation of state at sub-nuclear densities for core-collapse simulations. United States. doi:10.1063/1.4763423.
Furusawa, Shun, Yamada, Shoichi, Sumiyoshi, Kohsuke, Suzuki, Hideyuki, Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Numazu College of Technology, Ooka 3600, Numazu, Shizuoka 410-8501, and Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510. Mon . "A new baryonic equation of state at sub-nuclear densities for core-collapse simulations". United States. doi:10.1063/1.4763423.
@article{osti_22075770,
title = {A new baryonic equation of state at sub-nuclear densities for core-collapse simulations},
author = {Furusawa, Shun and Yamada, Shoichi and Sumiyoshi, Kohsuke and Suzuki, Hideyuki and Department of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 and Numazu College of Technology, Ooka 3600, Numazu, Shizuoka 410-8501 and Faculty of Science and Technology, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510},
abstractNote = {We construct a new equation of state for baryons at sub-nuclear densities for the use in core-collapse simulations of massive stars. The formulation is based on the nuclear statistical equilibrium description and the liquid drop approximation of nuclei. The model free energy to minimize is calculated by using relativistic mean field theory for nucleons and the mass formula for nuclei with atomic number up to {approx} 1000. We have also taken into account the pasta phase. We find that the free energy and other thermodynamical quantities are not very different from those given in the standard EOSs that adopt the single nucleus approximation. On the other hand, the average mass is systematically different, which may have an important effect to the rates of electron captures and coherent neutrino scatterings on nuclei in supernova cores. It is also interesting that the root mean square of the mass number is not very different from the average mass number, since the former is important for the evaluation of coherent scattering rates on nuclei but has been unavailable so far.},
doi = {10.1063/1.4763423},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1484,
place = {United States},
year = {2012},
month = {11}
}