nu.//sub >//sub e//sub =///sub e//sub =/<6 x 10/sup -12/.mu./sub B/, providing an independent supplementary bound. In a Minimally extended SM, Majorana's neutrino has null Magnetic Moment, while in an Extended SM, it. ![]() Besides, NMM strongly depends on the Beyond Standard Model (SM) scenario chosen. This reduces the effective weak cross sections for. In various extensions of the Standard Model, larger magnetic moments can occur without large neu- trino masses. Neutrino Magnetic Moment (NMM) is one of the key neutrino's property since it would allow to disentangled the still unknown Majorana or Dirac neutrino's nature. A massive Dirac neutrino has a magnetic moment, which causes its spin to precess in a magnetic field. The absence of such events imposes the upper bound. In the minimally-extended Standard Model, neutrinos of massm have tiny loop-induced magnetic moments ’3 1019 B(m 1eV), where Bis the Bohr magneton. Neutrino magnetic moment effects in neutrino nucleus reactions Phys Rev C Nucl Phys. From the supernova 1987A up to 100 neutrinos from this additional output should have been detected in the Kamiokande II detector. Neutrino magnetic moment effects in neutrino nucleus reactions. We show that the magnetic dipole moment of electron neutrino does not get a significant contribution from thermal background to meet the cosmological bound. The magnetic dipole moment of neutrinos is modified at high temperature and chemical potential. We calculate the spectra of the emitted neutrinos and the associated lepton-number decrease. We recalculate the magnetic moment of neutrinos in a hot and dense medium. nu./sub e/ ''collapse burst.'' This also reduces the trapped lepton number of the collapsing star. Theoretically, it is possible to account for a neutrino magnetic moment only as the result of the interaction of the electromagnetic field with charged particles into which the neutrino can transform virtually. >10/sup more » -13/.mu./sub B/ the coherently enhanced dipole scattering on the large nuclei in a collapsing star would flip the trapped left-handed neutrinos into right-handed ones, which would escape in a highly energetic prebounce. We find two independent new upper bounds of 1.5 x 10/sup -12/.mu./sub B/ and 6 x 10/sup -12/.mu./sub B/ on the dipole moment of electron neutrinos, improving the existing bounds by one to two orders of magnitude and ruling out the proposed solar-neutrino effect. A search for the solar neutrino effective magnetic moment has been performed using data from 1291.5 days exposure during the second phase of the Borexino experiment. Here we give a detailed analysis of their implications for a stellar collapse. Certain values were recently proposed to explain the time variation in the detected solar-neutrino flux and an extragalactic background of ionizing radiation. Magnetic or electric dipole moments of neutrinos are indicators for possible extensions of the standard weak-interaction model. ![]() This may lead to various consequences for supernova physics.
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