1994/02/17 by Naoya Hata, Hata, Naoya
Physics and Astronomy · #Astrophysics (astro-ph) #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #astro-ph #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9402311
(Revtex 3.0, 19 pages + 8 figures (uuencoded ps files attached), Easy way: ps file of entire text with embedded figures available by anonymous ftp at upenn5.hep.upenn.edu, get vacuum.uu in pub/hata/papers/, UPR-0605T)
arxiv created 1994/02/17 · openalex publication_date 1994/02/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Vacuum oscillations are considered for the combined solar neutrino observations, including the Kamiokande II spectrum data and incorporating theoretical uncertainties and their correlations. Despite the conceptual difficulty of the fine tuning between the neutrino parameters and the Sun-Earth distance, 2-flavor vacuum oscillations provide phenomenologically acceptable solutions. There are allowed regions at 99% C.L. for Δm2 = (0.45 - 1.2) × 10-10 eV 2 and sin22θ= 0.6 - 1; the best fit solution is χ2 / d.f. = 19.2 / 16, which is acceptable at 16% C.L. Oscillations for sterile neutrinos are, however, excluded by the averaged data at 99.4% C.L. The vacuum oscillation solutions predict characteristic energy spectrum distortions and seasonal variations in Sudbury Neutrino Observatory, Super-Kamiokande, and BOREXINO. Those predictions are given in detail, emphasizing that the vacuum solutions are distinguishable from the MSW solutions.