Seasonal and energy dependence of solar neutrino vacuum oscillations

We make a global vacuum neutrino oscillation analysis of solar neutrino dat a, including the seasonal and energy dependence of the recent Super-Kamioka nde 708-day results. The best fit parameters for v(e), oscillations to an a ctive neutrino are delta m(2) = 4.42 X 10(-10) eV(2), sin(2)2 theta = 0.93. The allowed mixing angle region is consistent with bi-maximal mixing of th ree neutrinos. Oscillations to a sterile neutrino are disfavored. Allowing an enhanced hep neutrino flux does not significantly alter the oscillation parameters. (C) 1999 Elsevier Science B.V. All rights reserved.