2002/07/31 by Sergio Pastor, Georg Raffelt · 1 citation
Physics and Astronomy · #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevlett.89.191101
published as Phys.Rev.Lett. 89 (2002) 191101 · 5 pages, 2 figures (second one available in color and b/w). To be published in PRL
arxiv created 2002/10/11 · arxiv updated 2009/11/30
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 Ye 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.