The anisotropy of the positrons emitted is the reaction <(nu)over bar>(e) + p --> n + e(+) has to be taken into account for extracting an antineutrino signal in Superkamiokande. For the Sun, this effect allows a sensitivity to nu(e) --> <(nu)over bar>(e) transition probability at the 3% level already with the statistics collected is the first hundred days. For a supernova in the Galaxy, the effect is crucial for extracting the correct ratio of nu - e to <(nu)over bar>(e) - p events.
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