Production mechanism of backward energetic protons studied from two-particle correlations in 800 MeV proton-nucleus collisions

Journal Article · Sat Jun 01 04:00:00 EDT 1985 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.31.2168· OSTI ID:5546921

Miake, Y; Hamagaki, H; Kadota, S; Nagamiya, S; Schnetzer, S; Shida, Y; Steiner, H; Tanihata, I

The relative importance of various mechanisms which may play a role in the production of backward energetic protons has been studied in 800 MeV proton-nucleus collisions. Energetic protons (P> or =350 MeV/c) at theta = 118/sup 0/ were measured in coincidence with particles emitted in the angular range from 15/sup 0/ to 100/sup 0/. Both in-plane (..delta..phi = 180/sup 0/) and out-of-plane (..delta..phi = 90/sup 0/) coincidences were measured. The data have been decomposed into several categories depending on the excitation energy of the residual nucleus. Momentum spectra, angular distributions, and target mass dependences of these categories have been studied. The scattering of the incident proton by a correlated nucleon cluster seems to play an important role. From the proton spectrum associated with the p-d quasi-elastic scatterings, the momentum spread of the pn system (''d'') inside the nucleus has been determined. The momentum spread of the ''d'' obtained by the p-d quasi-elastic scatterings is found to be smaller than the spread observed in heavy-ion projectile fragmentation into deuterons. From the mass dependence of the ratio of the p-d to p-p quasi-elastic scattering cross sections, the mean free path of deuterons inside the nucleus has been determined.

• Research Organization: Institute for Nuclear Study, University of Tokyo, Midori-cho, Tanashi-shi, Tokyo 188, Japan and Nuclear Science Division, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• OSTI ID: 5546921
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 31:6; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL COMPOUNDS
ANGULAR DISTRIBUTION
BARYON REACTIONS
CARBON
CHARGED PARTICLES
CHARGED-PARTICLE REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COINCIDENCE SPECTROMETRY
CROSS SECTIONS
DEUTERONS
DIFFERENTIAL CROSS SECTIONS
DIRECT REACTIONS
DISTRIBUTION
ELEMENTS
ENERGY RANGE
FLUORIDES
FLUORINE COMPOUNDS
FRAGMENTATION
HADRON REACTIONS
HALIDES
HALOGEN COMPOUNDS
LEAD
MASS
METALS
MEV RANGE
MEV RANGE 100-1000
NONMETALS
NUCLEAR REACTIONS
NUCLEON REACTIONS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
PROTON REACTIONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SILVER
SODIUM COMPOUNDS
SODIUM FLUORIDES
TRANSITION ELEMENTS