Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2002-03-12
Nucl.Phys. A707 (2002) 224-238
Physics
Nuclear Physics
Nuclear Theory
18 pages, LaTeX, 8 postscript figures; submitted to Nucl. Phys. A
Scientific paper
10.1016/S0375-9474(02)00919-3
The production of antiprotons in $p+A$ reactions is calculated in a microscopic transport approach employing hadronic and string degrees of freedom (HSD). It is found that the abundancies of antiprotons as observed by the E910 Collaboration in $p+A$ reactions at 12.3 GeV/c as well as 17.5 GeV/c can approximately be described on the basis of primary proton-nucleon and secondary meson-baryon production channels for all targets. The transport calculations demonstrate that the antiproton rapidity distributions for heavy targets are sensitive to the $\bar{p}$ (or hadron) formation time in the nuclear medium. Within our analysis the data from the E910 Collaboration are reasonably described with a formation time of $ 0.4-0.8$ fm/c in the hadron rest frame.
Bratkovskaya Elena L.
Cassing Wolfgang
Hansen Olaf
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