Aperiodic Spin-Flavor Conversions and $\tildeν_e$ from the Sun with Random Magnetic Field

Semikoz, V. B.; Bykov, A. A.; Popov, V. Yu.; Rez, A. I.; Sokoloff, D. D.

Aperiodic Spin-Flavor Conversions and $\tildeν_e$ from the Sun with Random Magnetic Field

Authors

Description

The magnetic field in the solar convective zone has a random small-scale component with the r.m.s. value substantially exceeding the strength of a regular large-scale field. For two Majorana neutrino flavors $\times$ two helicities in the presence of a neutrino transition magnetic moment and nonzero neutrino mixing we analyze the displacement of the allowed ($Δm^2 - \sin^22θ$) - parameter region reconciled for the SuperKamiokande(SK) and radiochemical (GALLEX, SAGE, Homestake) experiments in dependence on the r.m.s. magnetic field value $b$. We find an effective production of electron antineutrinos in the Sun even for small neutrino mixing through the cascade conversions in the random magnetic field that would be a signature of the Majorana nature of neutrino if $\tildeν_{eR}$ will be registered. Basing on the present SK bound on electron antineutrinos we also estimated the corresponding excluded area in the plane $Δm^2, \sin^22θ$.
LaTex 10 pages, 5 PostScript figures included, Talk given at the EU Conference "New Trends in Neutrino Physics", Ringberg, May 1998