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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Nuclear Astrophysics III
HK 19.3: Talk
Tuesday, March 15, 2016, 14:45–15:00, S1/01 A02
A comparison of equation of state models with different cluster suppression mechanisms — •Stefan Typel1 and Helena Pais2 — 1GSI, Darmstadt — 2University of Coimbra, Portugal
In order to model the transition from clustered matter at subsaturation densities to uniform nucleon matter at baryon densities above nuclear saturation, a mechanism for the dissolution of clusters has to be implemented in theoretical approaches for the equation of state. A widely used heuristic method is the excluded-volume mechanism that assumes a finite size of nucleons and nuclei. An alternative description introduces medium-dependent mass shifts that mainly originate from the action of the Pauli principle.
In this contribution the predictions for the chemical composition and the thermodynamic properties of neutron star matter at finite temperatures in a statistical excluded-volume model [1,2] are compared with those of a mass-shift approach in a generalized relativistic density functional [2,3,4]. Since both description use the same interaction model for the nucleons, the observed differences can be attributed to the cluster description.
[1] M. Hempel, J. Schaffner-Bielich, Nucl. Phys. A 837 (2010) 210.
[2] M. Hempel at al., Phys. Rev. C 84 (2011) 055804.
[3] S. Typel et al., Phys. Rev. C 81 (2010) 015803.
[4] S. Typel, arXiv:1504.01571[nucl-th] (2015).