Phase effects in neutrino conversions during a supernova shock wave

Dasgupta, Basudeb ; Dighe, Amol (2007) Phase effects in neutrino conversions during a supernova shock wave Physical Review D, 75 (9). Article ID 093002. ISSN 1550-7998

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Neutrinos escaping from a core collapse supernova a few seconds after bounce pass through the shock wave, where they may encounter one or more resonances corresponding to Δm2atm. The neutrino mass eigenstates in matter may stay coherent between these multiple resonances, giving rise to oscillations in the survival probabilities of neutrino species. We provide an analytical approximation to these inevitable phase effects, that relates the density profile of the shock wave to the oscillation pattern. The phase effects are present only if the multiple resonances encountered by neutrinos are semiadiabatic, which typically happens for 10−5≲sin2θ13≲10−3. The observability of these oscillations is severely limited by the inability of the detectors to reconstruct the neutrino energy faithfully. For typical shock wave profiles, the detection of these phase effects seems rather unlikely. However, if the effects are indeed identified in the ν ̅e spectra, they would establish inverted hierarchy and a nonzero value of θ13.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:101400
Deposited On:09 Mar 2018 10:24
Last Modified:09 Mar 2018 10:24

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