For a 9.6 solar mass supernova, including scattered halo neutrinos delays the onset of collective neutrino oscillation at early times and sharpens spectral swap features, improving their detectability.
Role of dense matter in collective supernova neutrino transformations
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abstract
For neutrinos streaming from a supernova (SN) core, dense matter suppresses self-induced flavor transformations if the electron density n_e significantly exceeds the neutrino density n_nu in the conversion region. If n_e is comparable to n_nu one finds multi-angle decoherence, whereas the standard self-induced transformation behavior requires that in the transformation region n_nu is safely above n_e. This condition need not be satisfied in the early phase after supernova core bounce. Our new multi-angle effect is a subtle consequence of neutrinos traveling on different trajectories when streaming from a source that is not point-like.
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Neutrino halo effect on collective neutrino oscillation in iron core-collapse supernova model of a 9.6 $M_{\odot}$ star
For a 9.6 solar mass supernova, including scattered halo neutrinos delays the onset of collective neutrino oscillation at early times and sharpens spectral swap features, improving their detectability.