Dresden 2013 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 21: Nukleare Astrophysik
HK 21.3: Vortrag
Montag, 4. März 2013, 17:30–17:45, HSZ-403
Charged-current weak interaction processes in hot and dense matter and its impact on the spectra of neutrinos emitted from proto-neutron star cooling — Gabriel Martinez-Pinedo1,2, Tobias Fischer2,1, •Andreas Lohs1, and Lutz Huther1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2GSI Helmholtzzentrum für Schwerioneneforschung, Darmstadt
We have performed three-flavor Boltzmann neutrino transport radiation hydrodynamics simulations covering a period of 3 s after the formation of a protoneutron star in a core-collapse supernova explosion. We show that a treatment of charged-current neutrino interactions in hot and dense matter as suggested by Reddy et al. has a strong impact on the luminosities and spectra of the emitted neutrinos. Compared with simulations that neglect mean field effects on the neutrino opacities, we find that the luminosities of all neutrino flavors are reduced while the spectral differences between electron neutrino and antineutrino are increased. Their magnitude depends on the equation of state and in particular on the symmetry energy at sub-nuclear densities. The proton-to-nucleon ratio of the outflow is reduced, increasing slightly their entropy. They are expected to have a substantial impact on the nucleosynthesis in neutrino-driven winds, even though they do not result in conditions that favor an r-process. Contrarily to previous findings, our simulations show that the spectra of electron neutrinos remain substantially different from those of other (anti)neutrino flavors during the entire deleptonization phase of the protoneutron star.