Recent experimental data confirm the solar-neutrino problem and imply new neutrino physics. We review some of the less discussed proposals to solve this problem: (1) maximal vacuum mixing of three neutrino flavors, (2) vacuum oscillation of two neutrino flavors, and (3) neutrino decay. Each of these three solutions can fit the ³⁷Cl and Kamiokande-II solar-neutrino-flux measurements. Their implications for the continuing ⁷¹Ga experiments and for other, future experiments are discussed.
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Acker et al. (1991) studied this question.
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