Heavy nuclei as thermal insulation for protoneutron stars

Ken'ichiro Nakazato, Hideyuki Suzuki, and Hajime Togashi
Phys. Rev. C 97, 035804 – Published 21 March 2018

Abstract

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.

  • Figure
  • Figure
  • Figure
  • Figure
  • Received 23 October 2017
  • Revised 27 February 2018

DOI:https://doi.org/10.1103/PhysRevC.97.035804

©2018 American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Ken'ichiro Nakazato1,*, Hideyuki Suzuki2, and Hajime Togashi3,4

  • 1Faculty of Arts and Science, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
  • 2Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
  • 3Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 4Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555, Japan

  • *nakazato@artsci.kyushu-u.ac.jp

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand
Issue

Vol. 97, Iss. 3 — March 2018

Reuse & Permissions
Access Options
CHORUS

Article Available via CHORUS

Download Accepted Manuscript
Author publication services for translation and copyediting assistance advertisement

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review C

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×