Abstract
We present data on hard-photon production in Au and C collisions at 95 MeV/nucleon. The photon source velocity is investigated as a function of system size, photon energy, and impact parameter. In the heavy system, is found to be sizably smaller than /2, except for very peripheral reactions. This unambiguously demonstrates that at intermediate bombarding energies photon emission is not solely dominated by first-chance p-n collisions, but carries also information on the later, stopping phase of the reaction.
- Received 25 October 1993
DOI:https://doi.org/10.1103/PhysRevLett.72.1608
©1994 American Physical Society