The anisotropy of inverse beta decay and antineutrino detection

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