dorsal/arxiv
View SchemaBeyond Mean Field Confrontation of Different Models with High Transverse Momentum Proton Spectra
| Authors | M. Germain, Ch. Hartnack, J. L. Laville, J. Aichelin, M. Belkacem, E. Suraud |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9901062 |
| URL | https://arxiv.org/abs/nucl-th/9901062 |
| DOI | 10.1016/S0370-2693(98)00943-5 |
| Journal | Phys.Lett. B437 (1998) 19-23 |
Abstract
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.
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"abstract": "Several models have been proposed to simulate heavy ion reactions beyond the\nmean field level. The lack of data in phase space regions which may be\nsensitive to different treatments of fluctuations made it difficult to judge\nthese approaches. The recently published high energy proton spectra, measured\nin the reaction 94 AMeV Ar + Ta, allow for the first time for a comparison of\nthe models with data. We find that these spectra are reproduced by Quantum\nMolecular Dynamics (QMD) and Boltzmann Uehling Uhlenbeck (BUU) calculations.\nModels like Boltzmann Langevin (BL) in which additional fluctuations in\nmomentum space are introduced overpredict the proton yield at very high\nenergies. The BL approach has been successfully used to describe the recently\nmeasured very subthreshold kaon production assuming that the fluctuations\nprovide the necessary energy to overcome the threshold in two body collisions.\nOur new findings suggest that the very subthreshold kaon production cannot be\ndue to two body scattering and thus remains a open problem.",
"arxiv_id": "nucl-th/9901062",
"authors": [
"M. Germain",
"Ch. Hartnack",
"J. L. Laville",
"J. Aichelin",
"M. Belkacem",
"E. Suraud"
],
"categories": [
"nucl-th"
],
"doi": "10.1016/S0370-2693(98)00943-5",
"journal_ref": "Phys.Lett. B437 (1998) 19-23",
"title": "Beyond Mean Field Confrontation of Different Models with High Transverse Momentum Proton Spectra",
"url": "https://arxiv.org/abs/nucl-th/9901062"
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