Pion-production in heavy-ion collisions at SIS energies

• DOI: 10.1007/s002180050198
• Publication Date: 2002-08-25T03:47:25Z
• Authors: S. Teis; W. Cassing; M. Effenberger; A. Hombach; U. Mosel; G. Wolf
• Keywords: Nuclear Theory (nucl-th); Nuclear Theory; 0103 physical sciences; FOS: Physical sciences; 01 natural sciences; 7. Clean energy

We investigate the production of pions in heavy-ion collisions in the energy range of $1$ - $2$ GeV/A. The dynamics of the nucleus-nucleus collisions is described by a set of coupled transport equations of the Boltzmann-Uehling-Uhlenbeck type for baryons and mesons. Besides the $N(938)$ and the $��(1232)$ we also take into account nucleon resonances up to masses of $1.9 GeV/c^2$ as well as $��$-, $��$- and $��$-mesons. We study in detail the influence of the higher baryonic resonances and the $2��$-production channels ($NN\to NN ����$) on the pion spectra in comparison to $��^-$ data from $Ar + KCl$ collisions at $1.8$ GeV/A and $��^0$-data for $Au+Au$ at 1.0 GeV/A. We, furthermore, present a detailed comparison of differential pion angular distributions with the BEVALAC data for Ar + KCl at 1.8 GeV/A. The general agreement obtained indicates that the overall reactions dynamics is well described by our novel transport approach.<br/>31 pages, 18 figures (inlcuded), to appear in Z. Phys. A<br/>