Physics
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvc..74d5801b&link_type=abstract
Physical Review C, vol. 74, Issue 4, id. 045801
Physics
16
Nuclear Matter Aspects Of Neutron Stars, Collective Models, Nuclear Matter, Relativistic Models
Scientific paper
Isospin and density waves in neutral neutron-proton-electron (npe) matter are studied within a relativistic mean-field hadron model at finite temperature with the inclusion of the electromagnetic field. The dispersion relation is calculated and the collective modes are obtained. The unstable modes are discussed and the spinodals, which separate the stable from the unstable regions, are shown for different values of the momentum transfer at various temperatures. The critical temperatures are compared with the ones obtained in a system without electrons. The largest critical temperature, 12.39 MeV, occurs for a proton fraction yp=0.47. For yp=0.3 we get Tcr=5 MeV and for yp>0.495 Tcr≲8 MeV. It is shown that at finite temperature the distillation effect in asymmetric matter is not so efficient and that electron effects are particularly important for small momentum transfers.
Avancini Sidney S.
Brito Lucília
Chomaz Ph.
Menezes Débora P.
Providencia Constança
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