# Question

A v-bare can interact with a proton in a target of water (although this is very rare). The reaction is essentially the inverse of β–decay; that is, the proton is converted into a neutron. Neutrino experimenters can detect this reaction by using detectors. The neutrino “signature” occurs when the detector simultaneously records a -ray with energy of 2.22 MeV and two others each of 0.511 MeV. Write the reaction and explain where the three y-rays come from.

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