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HK: Fachverband Physik der Hadronen und Kerne

HK 25: Struktur und Dynamik von Kernen

HK 25.3: Vortrag

Dienstag, 18. März 2014, 17:30–17:45, HZ 5

Neutrino interactions with supernova matter^⋆ — •Alexander Bartl^1,2, Christopher J. Pethick^3,4, Achim Schwenk^2,1, and Maria Voskresenskaya^2,1 — ¹Institut für Kernphysik, Technische Universität Darmstadt — ²ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH — ³The Niels Bohr International Academy, The Niels Bohr Institute, Copenhagen, Denmark — ⁴NORDITA, Royal Institute of Technology and Stockholm University, Stockholm, Sweden

Neutrino pair bremsstrahlung and absorption (NN↔ NNνν) and inelastic scattering of neutrinos (NNν↔ν NN) are of great relevance for the generation of and energy transport by neutrinos in core-collapse supernovae. In this talk, we will show that in mixtures of protons and neutrons the interaction rates are enhanced at subnuclear densities due to the large scattering lengths. As a result, the rate for neutrino pair bremsstrahlung and absorption is significantly larger below 10¹³ g cm⁻³ compared to rates currently used in supernova simulations, which are based on the one-pion-exchange approximation. We will also show further results for neutrino interaction rates up to nuclear densities obtained in the framework of chiral effective field theory.

^⋆This work was supported by the Studienstiftung des Deutschen Volkes, ARCHES, the Helmholtz Alliance HA216/EMMI and the ERC Grant No. 307986 STRONGINT.