# Darmstadt 2016 – wissenschaftliches Programm

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# HK: Fachverband Physik der Hadronen und Kerne

## HK 67: Nuclear Astrophysics VI

### HK 67.2: Vortrag

### Freitag, 18. März 2016, 14:30–14:45, S1/01 A02

**Microphysics of neutrino-nucleon interactions in supernova matter** — •Andreas Lohs^{1} and Gabriel Martinez-Pinedo^{2,3} — ^{1}Universität Basel, Schweiz — ^{2}Technische Universität Darmstadt — ^{3}GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt

In core-collapse supernova (CCSN) simulations, neutrino-nucleon interactions are mostly described by simplified microphysics, such as the so called elastic approximation. Further subleading order contributions, resulting from tensor couplings in the weak hadronic current and from nucleon recoil, are often included in the form of analytic correction factors. We compare these approximations with exact calculations of the mean free path in the picture of quasi free nucleons. We find that deviations to the approximations of the order of 10% appear already at relatively low temperatures of a few MeV or densities around 10^{1}2 g/cm^{3}. It is therefore recommended to include the exact neutrino-nucleon microphysics in order to achieve e.g. reliable predictions for the emitted neutrino spectrum during the first hundred milliseconds to several seconds postbounce. Eventually we discuss possible improvements to the analytic approximations to improve their applicability.