Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 49: Nukleare Astrophysik
HK 49.6: Vortrag
Donnerstag, 20. März 2014, 18:00–18:15, HZ 5
Microscopic calculations and energy expansions for neutron-rich matter — •Christian Drischler1,2, Vittorio Somà1,2, and Achim Schwenk2,1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH
We investigate the properties of asymmetric nuclear matter with two- and three-nucleon interactions based on chiral effective field theory. Focusing on neutron-rich matter, we calculate the energy for different proton fractions and include estimates of the theoretical uncertainty. We use our ab-initio results to test the quadratic expansion around symmetric matter with the symmetry energy term, and confirm its validity for highly asymmetric systems. Our calculated energy densities are in remarkable agreement with an empirical parameterization, developed to interpolate between pure neutron and symmetric nuclear matter. These findings are very useful for astrophysical applications and for developing new equations of state.
*This work was supported by the DFG through Grant SFB 634, the Helmholtz Alliance HA216/EMMI and the ERC Grant No. 307986 STRONGINT.