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Seasonal dependence in the solar neutrino flux
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Mikheyev-Smirnov-Wolfenstein (MSW) solutions of the solar neutrino problem predict a seasonal dependence of the zenith angle distribution of the event rates, due to the nonzero latitude at the Super-Kamiokande site. We calculate this seasonal dependence and compare it with the expectations in the no-oscillation case as well as just-so scenario, in the light of the latest Super-Kamiokande 708-day data. The seasonal dependence can be sizable in the large mixing angle MSW solution and would be correlated with the day-night effect. This may be used to discriminate between MSW and just-so scenarios and should be taken into account in refined fits of the data.
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HOLANDA, P. C. de, et al. Seasonal dependence in the solar neutrino flux. Physical Review D. 1999. Vol. 60, num. 9, pags. 093010-1-093010-4. ISSN 0556-2821. [consulted: 23 of May of 2026]. Available at: https://hdl.handle.net/2445/12502