Coherent Bremsstrahlung in the alpha+p system at 50 MeV/nucleon

Photons originating from coherent bremsstrahlung have been measured over a large dynamic range for the reaction of 200 MeV alpha particles with proton s. At low photon energies the bremsstrahlung spectrum exhibits the classica l behavior with an approximate 1/E-gamma shape. At higher photon energies t here is a pronounced contribution from capture into the unbound ground stat e and first excited state of Li-5. These results allow one, for the first t ime, to test theoretical models for a consistent description of bremsstrahl ung and radiative capture in a complex system. Calculations predict both fe atures qualitatively but fail to account for their relative importance.