2 research outputs found
Supernova Neutrino Spectrum with Matter and Spin Flavor Precession Effects
We consider Majorana neutrino conversions inside supernovae by taking into
account both flavor mixing and the neutrino magnetic moment. We study the
adiabaticity of various possible transitions between the neutrino states for
both normal and inverted hierarchy within the various solar neutrino problem
solutions. From the final mass spectrum within diffrent scenarios, we infer the
consequences of the various conversion effects on the neutronization peak, the
nature of final spectra, and the possible Earth matter effect on the final
fluxes. This enable us to check the sensibility of the SN neutrino flux on
magnetic moment interaction, and narrow down possible scenarios which depend
on: the mass spectrum normal or inverted, the solution of the solar neutrino
problem; and the value of MuxB.Comment: 24pages, 7 figure
The MSW effect and Matter Effects in Neutrino Oscillations
The MSW (Mikheyev-Smirnov-Wolfenstein) effect is the adiabatic or partially
adiabatic neutrino flavor conversion in medium with varying density. The main
notions related to the effect, its dynamics and physical picture are reviewed.
The large mixing MSW effect is realized inside the Sun providing the solution
of the solar neutrino problem. The small mixing MSW effect driven by the 1-3
mixing can be realized for the supernova (SN) neutrinos. Inside the collapsing
stars new elements of the MSW dynamics may show up: the non-oscillatory
transition, non-adiabatic conversion, time dependent adiabaticity violation
induced by shock waves. Effects of the resonance enhancement and the parametric
enhancement of oscillations can be realized for the atmospheric and accelerator
neutrinos in the Earth. Precise results for neutrino oscillations in the low
density medium with arbitrary density profile are presented and the attenuation
effect is described. The area of applications is the solar and SN neutrinos
inside the Earth, and the results are crucial for the neutrino oscillation
tomography.Comment: 18 pages, latex, 6 figures, talk given at the Nobel Symposium 129,
``Neutrino Physics'', Haga Slott, August 19 - 24, 200