Testing solar neutrino MSW oscillations at low delta m^2 through time variations of event rates in GNO and BOREXINO

Details Testing solar neutrino MSW oscillations at low delta m^2 through time variations of event rates in GNO and BOREXINO Testing solar neutrino MSW oscillations at low delta m^2 through time variations of event rates in GNO and BOREXINO

1999-10-18

arxiv.org/abs/hep-ph/9910387v1

Phys.Rev.D61:073009,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages (RevTeX) + 5 figures (PostScript)

Scientific paper

10.1103/PhysRevD.61.073009

The Mikheyev-Smirnov-Wolfenstein (MSW) explanation of the solar neutrino problem is currently compatible with three distinct regions of the two-neutrino oscillation parameter space (delta m^2,sin^2 2theta). We focus on the region with the lowest value of delta m^2 (~10^{-7} eV^2), which implies significant Earth regeneration effects for low-energy solar neutrinos. We point out that such effects are not only observable as day-night variations of neutrino event rates in the real-time BOREXINO experiment, but also as seasonal variations in the radiochemical Gallium Neutrino Observatory (GNO) at Gran Sasso. We present detailed calculations of the difference between winter and summer rates in GNO (six months averages) in excess of the trivial seasonal variation due to the Earth orbital eccentricity. We show that, within the low-delta m^2 MSW solution, the net winter-summer GNO rate difference amounts to 4-6 SNU, with a dominant contribution from pp neutrinos. We also give analytical expressions for the winter and summer solar exposure functions at the Gran Sasso site.

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