11. A ve can interact with protons (very weakly but relatively strongly compared to other nuclei), usually the nucleus of the hydrogen atom in a water molecule in a target of water. The reaction is essentially the inverse of β− decay; that is, the proton is converted into a neutron. Neutrino experimenters can detect this reaction, and thus the neutrinos, by using γ-detectors. The neutrino “signature” occurs when the detector simultaneously records a γ-ray with energy of 2.22 MeV and two others each of 0.511 MeV. Write the reaction and explain where the three γ-rays come from. [Hint: 2.22 MeV is the binding energy of the deuteron and 0.511 MeV is the electron rest energy.]