Resonant and nonresonant spin-flip flavor precession of solar neutrinos

Details Resonant and nonresonant spin-flip flavor precession of solar neutrinos Resonant and nonresonant spin-flip flavor precession of solar neutrinos

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phrvd..41.2956p&link_type=abstract

Physical Review D (Particles and Fields), Volume 41, Issue 10, 15 May 1990, pp.2956-2963

Physics

6

Scientific paper

The parameter ranges of the neutrino flavor mass difference Δ2m21 and magnetic moment μ responsible for a solar-neutrino flux deficit are investigated in the adiabatic approximation, assuming a large magnetic field, B=105 G. A resonant effect becomes dominant for Δ2m21>3.5×10-8 eV2 and decreases for smaller Δ2m21. The lower bound on the neutrino magnetic moment is around μ~(1.5-4)×10-12μB, in which range Δ2m21<~2×10-8 eV2. For Δ2m21>(4-5)×10-6 eV2 the flux deficit becomes unacceptably large (0.7), ruling out the present scenario. In the limit of degenerate neutrinos, where no resonant effect is present, a deficit greater than 0.3 implies μ>~3.5×10-12μB and has an upper bound ~=0.50.

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