Author/Authors :
WA80 Collaboration، نويسنده , , T.C. Awes، نويسنده , , D. Bock، نويسنده , , R. Bock، نويسنده , , G. Clewing، نويسنده , , S. Garpman، نويسنده , , R. Glasow، نويسنده , , H.?. Gustafsson، نويسنده , , A. Morsch and H.H. Gutbrod، نويسنده , , G. H?lker، نويسنده , , P. Jacobs، نويسنده , , K.H. Kampert، نويسنده , , B.W. Kolb، نويسنده , , Th. Lister، نويسنده , , H. Lohner، نويسنده , , I. Lund، نويسنده , , F.E. Obenshain، نويسنده , , A. Oskarsson، نويسنده , , I. Otterlund، نويسنده , , T. Peitzmann، نويسنده , , et al.، نويسنده ,
Abstract :
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” correlation, 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.
