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Coplanarity of two-proton emissions in 400 MeV/nucleon Ne + NaF, Pb reactions

Conference ·
OSTI ID:5918824
Two-proton coincidence spectra have been measured in a wide kinematical range for /sup 20/Ne + NaF and /sup 20/Ne + Pb collisions at 400 MeV/nucleon. Coplanar-type correlations show different feature between Ne + NaF and Ne + Pb target reactions. A strong in-plane correlation, which correspond to quasi-elastic scatterings (QES) of nucleons, was observed in wide angular range (15 to 90/sup 0/) in NaF target collisions. Angular distributions of QES were reproduced reasonably well by a single nucleon-nucleon scattering model. Enhancement of the QES at momentum transfer around t = 2 - 3m/sub ..pi../, which is predicted as an indication of pionic instability, was not observed. In Ne + Pb collisions, an azimuthally asymmetric emission of particles with respect to the beam axis were implied by the anti-coplanar correlation. A new type of coplanar correlation between the emission angle and the momentum suggests a back-to-back emission of projectile and target nucleons. 8 references, 8 figures.
Research Organization:
Lawrence Berkeley Lab., CA (USA); Tokyo Univ., Tanashi (Japan). Inst. for Nuclear Study
DOE Contract Number:
AC03-76SF00098
OSTI ID:
5918824
Report Number(s):
LBL-18777; CONF-8410210-6; ON: DE85006590
Country of Publication:
United States
Language:
English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR CORRELATION
BARYONS
CHARGED-PARTICLE REACTIONS
COINCIDENCE METHODS
CORRELATION FUNCTIONS
CORRELATIONS
COUNTING TECHNIQUES
DATA
DIRECT REACTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
FLUORINE
FUNCTIONS
HADRONS
HALOGENS
HEAVY ION REACTIONS
INFORMATION
LEAD
METALS
MEV RANGE
MEV RANGE 100-1000
NEON 20 REACTIONS
NONMETALS
NUCLEAR REACTIONS
NUCLEONS
NUMERICAL DATA
PROTONS
QUASI-ELASTIC SCATTERING
QUASI-FREE REACTIONS
SCATTERING
SODIUM 23 TARGET
TARGETS