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- W2247472146 abstract "The resonant transition effects MSW and NSFP for three flavour Majorana neutrinos in a supernova are considered. In this scenario, the deformed thermal neutrino distributions are obtained for different choices of the electron-tau mixing angle. Among the mechanisms proposed to explain the solar neutrino problem, certainly, the most promising solution is provided by the resonant oscillation mechanism, the Mikheyev-Smirnov-Wolfenstein effect (MSW) [1], which is the most natural and seems to have the correct energy dependence. Nevertheless, one can imagine the superposition of a Neutrino Spin-Flavour Precession (NSFP) mechanism too [2, 3]. This effect is relevant when a strong transverse magnetic field is present and if the magnetic dipole moments of neutrinos are large enough. Such conditions can occur in a supernova and for these reasons, recently, the resonant neutrino oscillations in a supernova, for three-flavour Majorana neutrinos, have been considered [4]. For three flavour Majorana neutrinos the light degrees of freedom weakly interacting can be denoted by νeL , νμL , ντL (νeR , νμR , ντR for antineutrinos). 2 In presence of a transverse magnetic dipole moment a neutrino can flip its spin and thus change its chirality. This kind of transitions are called Neutrino Spin–Flavour Precessions (NSFP) [2], and their probability can be relevant in presence of huge transverse magnetic field and for large off-diagonal dipole magnetic moment. In analogy with MSW, even the NSFP can receive a resonant enhancement from the presence of a dense medium [2], and this is for example the case of stellar matter or the extreme condition of a supernova. To be published in the Proceedings of the 8th Lomonosov Conference, 25 30 August, Moscow, 1997. For simplicity, hereafter we will omit the indication of chirality being clear that it is lefthanded for neutrinos and right-handed for antineutrinos." @default.
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- W2247472146 date "1998-01-01" @default.
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- W2247472146 title "Supernova neutrinos and resonant transitions" @default.
- W2247472146 hasPublicationYear "1998" @default.
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