Target rapidity proton distributions for SI+A collisions at the AGS
We present preliminary results for the production of protons in 14.6 GeV/c Si+A collisions measured by the E859 Target Rapidity Phoswich Array at the Brookhaven AGS. The Phoswich Array consists of 42 {Delta}E {minus} E scintillator telescopes covering an azimuthal angular range of roughly 24 degrees and a laboratory polar angular range of 50 < {theta} < 130 degrees, corresponding to {plus_minus}0.75 units of pseudo-rapidity from that of the target. The {Delta}E {minus} E technique allows the separation of pions, protons, deuterons and higher mass baryon clusters for a reasonably large range of incident kinetic energies. Clean identification and kinetic energy determination of protons is obtained for kinetic energies ranging from 30 MeV up to 120--200 MeV (240 MeV/c to 490--645 MeV/c in momentum), depending on the proton spectrum. Our previous results for the proton rapidity density distribution for central Si+Au collisions indicate that the proton distribution increases dramatically at lower rapidities, down to the edge of the spectrometer acceptance at y {approx_equal} 0.5. These abundant low rapidity protons presumably originate from the target and are boosted forward by interactions with other particles. The proton distributions near target rapidity serve to constrain possible theoretical models which attempt to describe dynamical effects involving target nucleons. These results are discussed in light of other experimental data as well as relevant models of nucleus-nucleus collisions.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States); US-Japan High Energy Physics Collaboration
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10134522
- Report Number(s):
- UCRL-JC--108446; CONF-9111201--1; ON: DE92008601
- Country of Publication:
- United States
- Language:
- English
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Target rapidity proton distributions for Si+A collisions at the AGS
Target rapidity proton distributions for Si+A collisions at the AGS
Related Subjects
663450
663580
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
A = 190-219
BROOKHAVEN AGS
DISTRIBUTION
GOLD 197 TARGET
HADRON INTERACTIONS
HEAVY-ION-INDUCED REACTIONS AND SCATTERING
PARTICLE PRODUCTION
PARTICLE RAPIDITY
PROTONS
SILICON 28 REACTIONS
TRANSVERSE MOMENTUM