Heidelberg 2015 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 62: Nuclear Astrophysics 5
HK 62.3: Talk
Thursday, March 26, 2015, 17:45–18:00, P/H1
Impact of bremsstrahlung on the neutrinosphere for muon and tau neutrinos⋆ — •Hannah Yasin1, Almudena Arcones1,2, and Alexander Bartl1 — 1Institut für Kernphysik, TU Darmstadt, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
Core-collapse supernovae present a challenging and exciting problem that strongly depends on all forces (strong, weak, electromagnetism, and gravity). Neutrinos, although weakly interacting, are key to transporting energy and momentum. Therefore, detailed treatment of neutrino reactions is critical to understand these high energy events. We have studied the impact of different neutrino reactions on the position of the neutrinosphere (i.e., region where neutrinos decouple from matter). Since the density in this region is high the effect of nuclear interactions has to be considered for bremsstrahlung [1]: N+N → N+N+ ν +ν. We have employed new, improved approaches [2] to calculate the inverse process and show the effect on the position of the neutrinosphere for muon and tau neutrinos.
[1] S. Hannestad and G. Raffelt, Astrophysical Journal 507 (1998) 339.
[2] A. Bartl, C. J. Pethick, and A. Schwenk, Physical Review Letters 113 (2014) 081101.
⋆ Supported by Helmholtz-University Young Investigator grant No. VH-NG-825.