A New Treatment of Neutrino Oscillations in Medium

Abstract

A new more rigorous and accurate method for treating neutrino oscillations in the context of the MSW effect in a medium is proposed. This leads to a new type of resonance condition which for small mixing angles puts rather stringent conditions on $E_{\nu }/\delta m^2$. The implications on the solar neutrino problem are discussed.

Comments: (IOA-304/4-93, LateX file 10p. + 3figures available upon request from gleonta@cc.uoi.gr)