1996/01/24 by T. C. Awes · 1 citation
Physics and Astronomy · #hep-ex
paper · pdf · doi:10.1016/0370-2693(96)00601-6
published as Phys.Lett. B381 (1996) 29-34 · 7 pages, figures included, complete postscript available at ftp://qgp.uni-muenster.de/pub/paper/azi-correlations.ps submitted to Phys. Lett. B
arxiv created 1996/01/24 · arxiv updated 2009/11/30
Results on the target mass dependence of proton and pion pseudorapidity distributions and of their azimuthal correlations in the target rapidity range -1.73 ≤ η≤ 1.32 are presented. The data have been taken with the Plastic-Ball detector set-up for 4.9 GeV p + Au collisions at the Berkeley BEVALAC and for 200 A⋅GeV/c p-, O-, and S-induced reactions on different nuclei at the CERN-SPS. The yield of protons at backward rapidities is found to be proportional to the target mass. Although protons show a typical ``back-to-back'' correlations, a ``side-by-side'' correlation is observed for positive pions, which increases both with target mass and with impact parameter of a collision. The data can consistently be described by assuming strong rescattering phenomena including pion absorption effects in the entire excited target nucleus.