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29 March 2024
 
  » arxiv » nucl-ex/9902009

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Centrality dependence of Pi- Production and Stopping in p-A Collisions at 18 GeV/c
I. Chemakin ; V. Cianciolo ; B.A. Cole ; R. Fernow ; A. Frawley ; M. Gilkes ; S. Gushue ; E.P. Hartouni ; H. Hiejima ; M. Justice ; J.H. Kang ; H. Kirk ; N. Maeda ; S. Mioduszewski ; D. Morrison ; M. Moulson ; M.N. Namboodiri ; G. Rai ; K. Read ; L. Remsberg ; M. Rosati ; Y. Shin ; R.A. Soltz ; S. Sorensen ; J. Thomas ; Y. Torun ; D. Winter ; X. Yang ; W.A. Zajc ; Y. Zhang ;
Date 19 Feb 1999
Subject nucl-ex
AbstractFirst 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.
Source arXiv, nucl-ex/9902009
Other source [GID 149107] nucl-ex/9902009
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