Neutrons from the Disintegration of the Separated Isotopes of Silicon by Deuterons

The neutron spectra from deuterons on silicon have been studied by the method of recoil protons and photographic plates. Thick isotopic targets of the three separated isotopes of silicon were irradiated by deuterons of energy 1.4 Mev, supplied by the Bartol Van de Graaff statitron, observations being carried out at angles of zero and ninety degrees with the incident deuterons. Q-values, from which energy levels in the residual nuclei of phosphorous may be calculated, are as follows: The estimated probable error in the Q-values is 40 kev.