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arXiv · 1702.00060

Flavor-dependent neutrino angular distribution in core-collapse supernovae

Irene Tamborra·Lorenz Huedepohl·Georg Raffelt·Hans-Thomas Janka
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Abstract

According to recent studies, the collective flavor evolution of neutrinos in core-collapse supernovae depends strongly on the flavor-dependent angular distribution of the local neutrino radiation field, notably on the angular intensity of the electron-lepton number carried by neutrinos. To facilitate further investigations of this subject, we study the energy and angle distributions of the neutrino radiation field computed with the Vertex neutrino-transport code for several spherically symmetric (1D) supernova simulations (of progenitor masses 11.2, 15 and 25 M_sun) and explain how to extract this information from additional models of the Garching group. Beginning in the decoupling region ("neutrino sphere"), the distributions are more and more forward peaked in the radial direction with an angular spread that is largest for $ν_e$, smaller for $\barν_e$, and smallest for $ν_x$, where $x=μ$ or $τ$. While the energy-integrated $ν_e$ minus $\barν_e$ angle distribution has a dip in the forward direction, it does not turn negative in any of our investigated cases.

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Irene Tamborra, Lorenz Huedepohl, Georg Raffelt, Hans-Thomas Janka. 2017-03-24. Flavor-dependent neutrino angular distribution in core-collapse supernovae. https://doi.org/10.3847/1538-4357%2Faa6a18

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