Heavy nuclei as thermal insulation for protoneutron stars

Ken'Ichiro Nakazato, Hideyuki Suzuki, Hajime Togashi

研究成果: Contribution to journalArticle

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A protoneutron star (PNS) is a newly formed compact object in a core collapse supernova. In this paper, the neutrino emission from the cooling process of a PNS is investigated using two types of nuclear equation of state (EOS). It is found that the neutrino signal is mainly determined by the high-density EOS. The neutrino luminosity and mean energy are higher and the cooling time scale is longer for the softer EOS. Meanwhile, the neutrino mean energy and the cooling time scale are also affected by the low-density EOS because of the difference in the population of heavy nuclei. Heavy nuclei have a large scattering cross section with neutrinos owing to the coherent effects and act as thermal insulation near the surface of a PNS. The neutrino mean energy is higher and the cooling time scale is longer for an EOS with a large symmetry energy at low densities, namely a small density derivative coefficient of the symmetry energy, L.

元の言語英語
記事番号035804
ジャーナルPhysical Review C
97
発行部数3
DOI
出版物ステータス出版済み - 3 21 2018

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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