Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-01-22
Phys.Lett. B437 (1998) 19-23
Physics
Nuclear Physics
Nuclear Theory
5 pages, 3 figures (eps), revtex
Scientific paper
10.1016/S0370-2693(98)00943-5
Several models have been proposed to simulate heavy ion reactions beyond the mean field level. The lack of data in phase space regions which may be sensitive to different treatments of fluctuations made it difficult to judge these approaches. The recently published high energy proton spectra, measured in the reaction 94 AMeV Ar + Ta, allow for the first time for a comparison of the models with data. We find that these spectra are reproduced by Quantum Molecular Dynamics (QMD) and Boltzmann Uehling Uhlenbeck (BUU) calculations. Models like Boltzmann Langevin (BL) in which additional fluctuations in momentum space are introduced overpredict the proton yield at very high energies. The BL approach has been successfully used to describe the recently measured very subthreshold kaon production assuming that the fluctuations provide the necessary energy to overcome the threshold in two body collisions. Our new findings suggest that the very subthreshold kaon production cannot be due to two body scattering and thus remains a open problem.
Aichelin Joerg
Belkacem M.
Germain M.
Hartnack Ch.
Laville J. L.
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