Dependence on Atomic Number of the Nuclear Photoeffect at High Energies

Abstract

A measurement was made of the number of neutron-proton coincidences observed when 320-Mev bremsstrahlung bombarded D, Li, Be, C, O, Al, Ti, Cu, Sn, and Pb. If one normalizes the data for the number of neutron-proton pairs in a nucleus (i.e., by dividing by $\frac{\mathrm{NZ}}{A}$) it is found that the observed coincidences decrease as $A$ increases.