Determination of the absorption mechanism in photon-induced pre-equilibrium reactions

Abstract

Spectra of protons and deuterons emitted in the photodisintegration of $^{27}\mathrm{Al}$ and $^{\mathrm{nat}}\mathrm{Ca}$ have been measured with the tagged photon technique. The experimental data are compared to the results of calculations using the hybrid model for pre-equilibrium reactions. For the first time it is possible to determine the relevant initial doorway configuration, i.e., a 2p-1h doorway, appropriate for quasideuteron absorption.