High-energy gamma emission in heavy-ion collisions at 9-14 MeV/nucleon.

Abstract

We have measured the cross sections for high-energy photon production in $^{12,13}\mathrm{C}$${+}^{92,100}$Mo reactions at incident beam energies of 9--14 MeV/nucleon. The bombarding energy dependence, angular distribution, and projectile-target mass dependence of the photon yields at high energy, ${\mathit{E}}_{\ensuremath{\gamma}}$\ensuremath{\ge}30 MeV, have been examined. Our measurements are consistent with production of these photons via nucleon-nucleon bremsstrahlung, the production mechanism dominant in heavy-ion collisions for E/A\ensuremath{\ge}20 MeV/nucleon.