Neutron Yields from Thick Targets Bombarded by 24-Mev Deuterons and 12-Mev Protons

The gross yields of neutrons produced by 24-Mev deuterons bombarding Be, Cu, Ta, and U and by 12-Mev protons bombarding Be, Cu, and Ta were measured by detecting the neutrons in a solution of MnSO4 that surrounded the targets. The yields were (in neutrons per μcoulomb): 24-Mev deuterons: Be, 1.85×1011; Cu, 0.55×1011; Ta, 0.52×1011; U, 0.73×1011; 12-Mev protons: Be, 4.1×1010; Cu, 0.61×1010; Ta, 0.15×1010.