Systematics of Photon- and Electron-Induced Spallation Reactions

Abstract

A semi-empirical four-parameter formula is proposed in order to systematize intermediate-and high-energy photon-and electroninduced spallation cross sections of medium weight nuclei. Analytical expressions for the parameters are obtained from parameter-values calculated by best-fitting of experimental data. We extend the same treatment to bremsstrahlung-induced spallation yields, and we verify that very similar analytical expressions for the parameters are obtained. Such a four-parameter formula has shown to predict reliable values of unmeasured spallation reaction cross sections. The reproducibility of the experimental data by the present formula is comparable with or better than those by other semi-empirical formulae with a larger number of parameters.