Neutrinos from P 32

Sources of P 32 which come close to being true monolayers are prepared by evaporation in a vacuum. The characteristics of these sources are maintained for 5 to 10 days with the aid of radiant heating. Surface charges are neutralized by periodic "baths" of thermal electrons. The momentum of the electrons is measured with a magnetic spectrometer and the momentum of the recoil ions is measured by observing their time of flight in a field free space.The momentum measurements show that the missing momentum disappears in one package. Separate energy measurements determine the amount of energy which disappears. The observed ratio of the missing energy to the missing momentum is equal to the velocity of light (±{}20 percent), as required by the hypotheses that one neutrino is emitted in beta-decay.After experimentally determined corrections are made for the effects of surface scattering of the recoil ions, it is concluded that the missing momentum vector (i.e., the neutrino) most probably enters the same hemisphere as the electron. The experimental points fit best on a curve of the form, (1+vccosθ). This is in disagreement with previous tentative conclusions by the author which are now shown to be in error due to surface losses and scattering of the recoil ions.