Mainz 2012 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
HK: Fachverband Physik der Hadronen und Kerne
HK 62: Nukleare Astrophysik
HK 62.3: Talk
Friday, March 23, 2012, 15:00–15:15, RW 2
Properties of Nuclei in Dense Matter and Equation of State — •Stefan Typel1, Thomas Klähn2, and Gevorg Poghosyan3 — 1GSI, Darmstadt, Germany — 2IFT, University of Wrocław, Poland — 3SCC, KIT, Karlsruhe, Germany
The detailed chemical composition of dense matter is relevant for simulations of astrophysical objects such as neutron stars or core-collapse supernovae. It depends strongly on the density and temperature of the environment and affects the thermodynamic properties encoded in the equation of state. In many applications, a simple nuclear statistical equilibrium description is used assuming an ideal mixture of nuclei with experimental masses in chemical equilibrium. However, the binding energies of nuclei are modified considerably in a medium. We calculate the change of nuclear properties with density and temperature in a relativistic density functional approach using the Thomas-Fermi approximation in a spherical Wigner-Seitz cell. Both the stabilization and the dissolution of nuclei are observed depending on the thermodynamic conditions. A parametrization of the binding energy shifts can be employed in the construction of improved equation of state tables. The results are also of interest for the analysis of fragment distributions in heavy-ion collisions.