Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 79: Nukleare Astrophysik
HK 79.3: Vortrag
Donnerstag, 7. März 2013, 17:45–18:00, HSZ-403
correlations in nuclear matter at low densities in an extended relativistic mean-field model — Maria Voskresenskaya and •Stefan Typel — GSI, Darmstadt
The knowledge of the equation of state of strongly interacting matter is required for the description of the variety of nuclear matter phases in a wide range of densities, temperatures and proton fractions. In this work we extend the generalized relativistic mean-field (gRMF) model with density dependent couplings by including two-body scattering correlations and pairing effects self-consistently in the model. We show that these two-body correlations modify the composition and thermodynamic properties of matter. Scattering states are represented by quasiparticles with density and temperature dependent properties. The correct low-density behavior of nuclear matter at finite temperatures is considered within a virial expansion. The comparison of the virial equation of state with the gRMF approach by means of a series expansion of the grand canonical potential in powers of the nucleon fugacities is performed. Consistency relations are derived which connect quasiparticle parameters with the meson-nucleon couplings in the vacuum and the phase shifts or effective-range parameters of nucleon-nucleon scattering. Pairing effects are considered with the Yamaguchi separable potential for 1S0 nn channel. Corresponding pairing gaps are computed for various temperatures. The overall effect of the pairing correlations on thermodynamic properties is estimated.