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arXiv · astro-ph/0207281

Flavor oscillations in the supernova hot bubble region: Nonlinear effects of neutrino background

Sergio Pastor·Georg Raffelt
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Abstract

The neutrino flux close to a supernova core contributes substantially to neutrino refraction so that flavor oscillations become a nonlinear phenomenon. One unexpected consequence is efficient flavor transformation for anti-neutrinos in a region where only neutrinos encounter an MSW resonance or vice versa. Contrary to previous studies we find that in the neutrino-driven wind the electron fraction Y_e always stays below 0.5, corresponding to a neutron-rich environment as required by r-process nucleosynthesis. The relevant range of masses and mixing angles includes the region indicated by LSND, but not the atmospheric or solar oscillation parameters.

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Sergio Pastor, Georg Raffelt. 2002-10-11. Flavor oscillations in the supernova hot bubble region: Nonlinear effects of neutrino background. https://doi.org/10.1103/physrevlett.89.191101

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