Centrality dependence of longitudinal and transverse baryon distributions in ultrarelativistic nuclear collisions

Journal Article · Thu Dec 01 04:00:00 EST 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.50.3047· OSTI ID:6847853

Barrette, J; Bellwied, R; Braun-Munzinger, P; Cleland, W E; Cormier, T M; David, G; Dee, J; Diebold, G E; Dietzsch, O; Germani, J V; Gilbert, S; Greene, S V; Hall, J R; Hemmick, T K; Herrmann, N; Hong, B; Jayananda, K; Kraus, D; Kumar, B S; Lacasse, R ; Lissauer, D; Llope, W J; Ludlam, T W; McCorkle, S; Majka, R; Mark, S K; Mitchell, J T; Muthuswamy, M; O'Brien, E; Pruneau, C; Rao, M N; Rotondo, F; daSilva, N C; Sonnadara, U; Stachel, J; Takai, H; Takagui, E M; Throwe, T G; Winter, C; Wang, G; Wolfe, D; Woody, C L; Xu, N; Zhang, Y; Zhang, Z; Zou, C ^[1]

---

1. Brookhaven National Laboratory, Upton, New York 11973 (United States) Gesellschaft fuer Schwerionenforschung, Darmstadt (Germany) McGill University, Montreal, Canada H3A (Canada) University of New Mexico, Albuquerque, New Mexico 87131 (United States) University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States) University of Sao Paulo, Sao Paulo (Brazil) SUNY, Stony Brook, New York 11

Inclusive double differential multiplicities [ital d][sup 2][ital N]/[ital dy] d[ital p][sub [ital t]] and related quantities have been measured for protons and deuterons produced in 14.6[ital A] GeV/[ital c] Si+Al and Si+Pb collisions using the E814 forward spectrometer at the AGS at BNL. Collision centrality'' is determined by measuring [ital N][sub [ital c]], the total charged particle multiplicity in the pseudorapidity range 0.85[lt][eta][lt]3.8. For both systems Si + Al and Si + Pb, an increase in the proton rapidity distribution [ital dN]/[ital dy] at midrapidity and a corresponding decrease at higher rapidities are observed with increasing [ital N][sub [ital c]]. For Si+Pb, Boltzmann slope parameters [ital T][sub [ital B]] increase significantly in the most central collisions. The measured distributions exhibit a centrality dependence even when [sigma]/[sigma][sub geo][approx lt]10%, where full overlap between the Si and Pb nuclei occurs in a simple geometric picture. The proton rapidity distribution [ital dN]/[ital dy] is presented for the symmetric system Si+Al over the entire rapididty interval. The total number of protons, which is the integral of this quantity over rapidity, varies with [ital N][sub [ital c]]. Results are compared with various model calculations, mostly using the hadronic cascade codes ARC and RQMD. No significant nuclear transparency is observed, indicating that large baryon and energy densities are produced in these collisions.

• OSTI ID: 6847853
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 50:6; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

663450* -- Heavy-Ion-Induced Reactions & Scattering-- (1992-)
663530 -- Nuclear Mass Ranges-- A=20-38-- (1992-)
663580 -- Nuclear Mass Ranges-- A=190-219-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27 TARGET
BARYONS
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
DEUTERONS
DISTRIBUTION
ELEMENTARY PARTICLES
ENERGY DENSITY
ENERGY RANGE
FERMIONS
HADRONS
HEAVY ION REACTIONS
LEAD 208 TARGET
MULTIPLICITY
NUCLEAR REACTIONS
NUCLEONS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PARTICLE RAPIDITY
PROTONS
RELATIVISTIC RANGE
SILICON 28 REACTIONS
TARGETS