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Analysis of hard two-photon correlations measured in heavy-ion reactions at intermediate energiesBarz, H.-W.; Kämpfer, B.; Wolf, S.; Bauer, W.
Analysis of hard two-photon correlations
measured in heavy-ion reactions at intermediate energies
H.W.Barz1,2, B.Kämpfer1,2, GY. Wolf3,4, W. Bauer5
1Institut für Kern- und Hadronenphysik, FZ Rossendorf,
PF 510119, 01314 Dresden, Germany
1Institut für Theoretische Physik, TU Dresden,
Momrnsenstr. 13, 01062 Dresden, Germany
3GSI Darmstadt, PF 110552, 64220 Darmstadt, Germany
4KFKI RMKI Budapest, POB. 49, H-1525 Budapest, Hungary
MSU Michigan, East Lansing, MI 48824, USA
Recently reported measurements of hard photon correlations in the reactions 36Ar On 27Al at 95 A*MeV, 86Kr on natNi at 60 A*MeV, and 181Ta on 197Au at 39.5 A*MeV are analyzed. A Boltzmann-Ühling-Uhlenbeck transport model is used to describe the photon production by individual nucleon-nucleon collisions. In the lighter systems we find the best agreement with data when taking into account only the photons from first chance collisions of nucleons or photons produced during the Passage of the nuclei, while the model predicts also a considerable late-time emission of photons which leads to a depletion of the calculated correlation function. The accuracy of the present data daas not allow firm conclusions on the reliability of this late time evolution. Our inveatigatiions do not support a recently reported interference pattern in the heavy Ta + Au system.
- Physical Review C 53 (1996) 2, R553-R557
- Forschungszentrum Rossendorf; FZR-111 Preprint