The equation of state and composition of hot, dense matter in core-collapse supernovaeстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The equation of state (EOS) and composition of matter are calculated for
conditions typical for pre-collapse and early collapse stages in
core-collapse supernovae. The composition is evaluated under the
assumption of nuclear statistical equilibrium, when the matter is
considered as an ''almost'' ideal gas with corrections owing to thermal
excitations of nuclei, to free nucleon degeneracy, and to Coulomb and
surface-energy corrections. The account of these corrections allows us
to obtain the composition for densities that are slightly below the
nuclear matter density. Through comparisons with the EOS developed by
Shen et al., which is used in most of recent supernova simulations, we
examine the differences of our EOS in the multi-composition with the EOS
in the approximation of one representative nucleus. We find that widely
distributed compositions in the nuclear chart are different because of
the different mass formulae we used, while the thermodynamical
quantities are quite close to those in Shen's EOS.