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|Type:||Artigo de periódico|
|Title:||Oscillations of very low energy atmospheric neutrinos|
|Abstract:||There are several new features in the production, oscillations, and detection of the atmospheric neutrinos of low energies E less than or similar to 100 MeV. The flavor ratio r of muon to electron neutrino fluxes is substantially smaller than 2 and decreases with energy, a significant part of events is due to the decay of invisible muons at rest, etc. Oscillations in a two-layer medium (atmosphere-Earth) should be taken into account. We derive analytical and semianalytical expressions for the oscillation probabilities of these "sub-sub-GeV" neutrinos. The energy spectra of the e-like events in water Cherenkov detectors are computed, and the dependence of the spectra on the 2-3 mixing angle theta(23), the 1-3 mixing, and the CP-violation phase are studied. We find that variations of theta(23) in the presently allowed region change the number of e-like events by about 15%-20% as well as lead to distortion of the energy spectrum. The 1-3 mixing and CP violation can lead to similar to 10% effects. Detailed study of the sub-sub-GeV neutrinos will be possible in future megaton-scale detectors.|
|Editor:||Amer Physical Soc|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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