Light clusters in warm stellar matter: Explicit mass shifts and universal cluster-meson couplings

Helena Pais, Francesca Gulminelli, Constança Providência, and Gerd Röpke
Phys. Rev. C 97, 045805 – Published 16 April 2018

Abstract

In-medium modifications of light cluster properties in warm stellar matter are studied within the relativistic mean-field approximation. In-medium effects are included by introducing an explicit binding energy shift analytically calculated in the Thomas-Fermi approximation, supplemented with a phenomenological modification of the cluster couplings to the σ meson. A linear dependence on the σ meson is assumed for the cluster mass, and the associated coupling constant is fixed by imposing that the virial limit at low density is recovered. The resulting cluster abundances come out to be in reasonable agreement with constraints at higher density coming from heavy-ion collision data. Some comparisons with microscopic calculations are also shown.

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  • Received 15 January 2018

DOI:https://doi.org/10.1103/PhysRevC.97.045805

©2018 American Physical Society

Physics Subject Headings (PhySH)

Nuclear PhysicsGravitation, Cosmology & Astrophysics

Authors & Affiliations

Helena Pais1, Francesca Gulminelli2, Constança Providência1, and Gerd Röpke3,4

  • 1CFisUC, Department of Physics, University of Coimbra, 3004-516 Coimbra, Portugal
  • 2LPC (CNRS/ENSICAEN/Université de Caen Normandie), UMR6534, 14050 Caen Cédex, France
  • 3Institut für Physik, Universität Rostock, D-18051 Rostock, Germany
  • 4National Research Nuclear University (MEPhI), 115409 Moscow, Russia

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Issue

Vol. 97, Iss. 4 — April 2018

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