Title of article :
Constraining mean-field models of the nuclear matter equation of state at low densities
Author/Authors :
M.D. Voskresenskaya، نويسنده , , S. Typel، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2012
Pages :
35
From page :
42
To page :
76
Abstract :
An extension of the generalized relativistic mean-field (gRMF) model with density dependent couplings is introduced in order to describe thermodynamical properties and the composition of dense nuclear matter for astrophysical applications. Bound states of light nuclei and two-nucleon scattering correlations are considered as explicit degrees of freedom in the thermodynamical potential. They are represented by quasiparticles with medium-dependent properties. The model describes the correct low-density limit given by the virial equation of state (VEoS) and reproduces RMF results around nuclear saturation density where clusters are dissolved. A comparison between the fugacity expansions of the VEoS and the gRMF model provides consistency relations between the quasiparticles properties, the nucleon–nucleon scattering phase shifts and the meson–nucleon couplings of the gRMF model at zero density. Relativistic effects are found to be important at temperatures that are typical in astrophysical applications. Neutron matter and symmetric nuclear matter are studied in detail.
Keywords :
Cluster formation , Neutron matter , Virial equation of state , correlations , Mean-field models , Nuclear matter
Journal title :
Nuclear physics A
Serial Year :
2012
Journal title :
Nuclear physics A
Record number :
1204045
Link To Document :
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