Neutrons Emitted in the Disintegration of Beryllium by Deuterons

Abstract

Neutrons obtained by bombarding a thick beryllium target with 600 keV. deuterons were studied by the photographic plate technique at angles of emission of 0, 90, and 150°. Five previously reported neutron groups were confirmed giving energy levels of B10 at 0?73,1?75,2·20, and 3·64 MeV. An additional group corresponding to an energy level of 2·85 MeV. was observed and the evidence for regarding these as genuine beryllium neutrons is discussed. The Q-value for the ground state transition is found to be 4·35±0·02MeV. which agrees with the value 4·36±0·04 deduced from the most recent masses.