A model based upon nucleon-nucleon (n-p) bremsstrahlung is presented as a possible explanation of high energy γ rays produced in heavy-ion collisions. A semiclassical bremsstrahlung formula is ‘‘calibrated’’ to p+d bremsstrahlung data, then incorporated into the Boltzmann master equation as a means for following the nucleon-nucleon collisions. The input parameters to the master equation are taken from previous studies of preequilibrium nucleon spectra, eliminating all free parameters from our calculation. The results of this calculation are compared to the available high energy γ-ray data, with generally excellent agreement. Data taken with lead glass detectors are generally underestimated in our model calculation.

• Received 20 January 1987

DOI:https://doi.org/10.1103/PhysRevC.35.1720