Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1997-10-20
Nucl.Phys. A632 (1998) 131-152
Physics
Nuclear Physics
Nuclear Theory
25 pages, latex, including 15 ps-figures, UGI-97-21, submitted to Nucl. Phys. A
Scientific paper
10.1016/S0375-9474(97)00809-9
We reanalyse the production of $p\bar{p}$ pairs in proton-nucleus and nucleus-nucleus collisions employing novel elementary cross sections for baryon-baryon and pion-baryon production channels based on a boson-exchange model. In contrast to previous transport studies performed in the literature the secondary pion induced channel is found to be most important in both p+A and A+A collisions at subthreshold energies. A detailed comparison with the experimental data available indicates that sizeable attractive $\bar{p}$ potentials in the order of - 100 to - 150 MeV at normal nuclear matter density are needed to reproduce the size and shape of the experimental spectra.
Cassing Wolfgang
Lykasov Gennadi I.
Rzjanin M. V.
Sibirtsev Alexander
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