Supernova equations of state including full nuclear ensemble with in-medium effects

Shun Furusawa, Kohsuke Sumiyoshi, Shoichi Yamada, Hideyuki Suzuki

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    We construct new equations of state for baryons at sub-nuclear densities for the use in core-collapse supernova simulations. The abundance of various nuclei is obtained together with thermodynamic quantities. The formulation is an extension of the previous model, in which we adopted the relativistic mean field theory with the TM1 parameter set for nucleons, the quantum approach for d, t, h and α as well as the liquid drop model for the other nuclei under the nuclear statistical equilibrium. We reformulate the model of the light nuclei other than d, t, h and α based on the quasi-particle description. Furthermore, we modify the model so that the temperature dependences of surface and shell energies of heavy nuclei could be taken into account. The pasta phases for heavy nuclei and the Pauli- and self-energy shifts for d, t, h and α are taken into account in the same way as in the previous model. We find that nuclear composition is considerably affected by the modifications in this work, whereas thermodynamical quantities are not changed much. In particular, the washout of shell effect has a great impact on the mass distribution above T∼1 MeV. This improvement may have an important effect on the rates of electron captures and coherent neutrino scatterings on nuclei in supernova cores.

    Original languageEnglish
    Pages (from-to)188-207
    Number of pages20
    JournalNuclear Physics A
    Volume957
    DOIs
    Publication statusPublished - 2017 Jan 1

    Fingerprint

    supernovae
    equations of state
    nuclei
    heavy nuclei
    fallout
    elementary excitations
    mass distribution
    electron capture
    nucleons
    surface energy
    baryons
    neutrinos
    formulations
    thermodynamics
    temperature dependence
    energy
    shift
    scattering
    simulation

    Keywords

    • Core-collapse supernova
    • Equation of state

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Supernova equations of state including full nuclear ensemble with in-medium effects. / Furusawa, Shun; Sumiyoshi, Kohsuke; Yamada, Shoichi; Suzuki, Hideyuki.

    In: Nuclear Physics A, Vol. 957, 01.01.2017, p. 188-207.

    Research output: Contribution to journalArticle

    Furusawa, Shun ; Sumiyoshi, Kohsuke ; Yamada, Shoichi ; Suzuki, Hideyuki. / Supernova equations of state including full nuclear ensemble with in-medium effects. In: Nuclear Physics A. 2017 ; Vol. 957. pp. 188-207.
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