1999/02/19 by I. Chemakin, V. Cianciolo, Chemakin, I. +65
Engineering · Physics and Astronomy · #Electrostatic Discharge in Electronics #FOS: Physical sciences #Integrated Circuits and Semiconductor Failure Analysis #Nuclear Experiment (nucl-ex) #Particle Detector Development and Performance #nucl-ex
paper · pdf · doi:10.48550/arxiv.nucl-ex/9902009
5 pages, 13 figures, submitted for publication to Phys. Rev. Lett., Formatted with RevTex
arxiv created 1999/02/19 · openalex publication_date 1999/02/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
First results are presented from BNL experiment E910 on pion production and stopping in proton-Be, Cu, and Au collisions at a beam momentum of 18 GeV/c. We characterize the centrality of the collisions using the measured number of "grey" tracks, Ngrey,and a derived quantity, nu, the number of inelastic nucleon-nucleon scatterings suffered by the projectile during the collision. We find that for the three targets the average backward rapidity shift of the leading proton follows a common trend versus nu with the projectile losing, on average, 2 units of rapidity in the first 2-3 scatterings. The average rapidity shift increases more slowly with subsequent scatterings reaching a maximum of 2.5 units. The pi- multiplicity measured within the E910 acceptance saturates with increasing nu in p-Au collisions while the pi- multiplicity in p-Be collisions increases faster with nu than expected from the wounded-nucleon model. Comparisons of our data with the RQMD cascade model suggest that in very central p-Au collisions most of the pions are produced near zero rapidity in the lab.