Nuclear interactions of 300-GeV protons in emulsion. [300 GeV, angular distributions]

Journal Article · Fri Apr 01 04:00:00 EST 1977 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.15.1867· OSTI ID:7115791

Hebert, J; Hebert, C J.D.; Areti, H; Adamovic, O; Juric, M; Baroni, G; di Liberto, S; Petrera, S; Romano, G; Baumann, G; Devienne, R; Bolta, J M; Rey, G; Kaiser, R; Massue, J P; Pfohl, R; Lory, J; Meton, C; Schune, D; Tsai-Chu, ; Willot, B; Haglund, R; Otterlund, I; Schmitt, R; van Ginneken, A; Vincent, M

Results from a study of p-nucleus interactions in emulsion at an incident energy of 300 GeV are presented. The observed events were separated into those belonging to the light (C,N,O) and the heavy (Ag, Br) groups of target nuclei. Some characteristics of the fast-charged- (shower-) particle multiplicity and angular distributions for the light and heavy groups, as well as for emulsion, are reported and compared with the results from our previous experiments at 200 GeV. The average number of shower particles, , has the values /sub CNO/ = 12.1 +- 0.5, /sub AgBr/ = 16.7 +- 0.5, and /sub em/ = 15.1 +- 0.2. The quantity R/sub A/, defined as the ratio of created charged particles in p-nucleus and p-p collisions, is consistent with the relation R/sub A/ = A/sup 0//sup .//sup 19/. While the width of the shower-particle distribution as measured by the dispersion D is greater at 300 GeV than at 200 GeV, the value of /D is about 1.68 at both energies. The average number of slow charged particles resulting from the evaporation of the target nucleus remains virtually unchanged at the two energies. The angular distributions of shower particles plotted in terms of eta = -ln tan(theta/2) show that, for a given nucleus, there are more particles at smaller angles at the higher energy, while there is no change in the distribution at large angles. In addition, for a given energy, the number of shower particles at larger angles increases with increasing size of the target nucleus.

• Research Organization: University of Ottawa, Ottawa, Canada
• OSTI ID: 7115791
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 15:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
BARYON REACTIONS
BROMINE
CARBON
CHARGED-PARTICLE REACTIONS
CRYOGENIC FLUIDS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
FLUIDS
GEV RANGE
GEV RANGE 100-1000
HADRON REACTIONS
HALOGENS
INTERACTIONS
METALS
MULTIPLE PRODUCTION
MULTIPLICITY
NITROGEN
NONMETALS
NUCLEAR EMULSIONS
NUCLEAR REACTIONS
NUCLEON REACTIONS
OXYGEN
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PROTON REACTIONS
SHOWERS
SILVER
TRANSITION ELEMENTS