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Author Bugg, D. V. ♦ Oxley, A. J. ♦ Zoll, J. A. ♦ Rushbrooke, J. G. ♦ Barnes, V. E. ♦ Kinson, J. B. ♦ Dodd, W. P. ♦ Doran, G. A. ♦ Riddiford, L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ANGULAR DISTRIBUTION ♦ BUBBLE CHAMBERS ♦ COUNTERS ♦ CROSS SECTIONS ♦ DIFFRACTION ♦ EFFICIENCY ♦ ENERGY RANGE ♦ HYDROGEN ♦ INTERACTIONS ♦ LIQUIDS ♦ MEV RANGE ♦ MOMENTUM ♦ NEUTRONS ♦ NUCLEAR REACTIONS ♦ OPE MODEL ♦ PARTICLE MODELS ♦ PERIPHERAL COLLISIONS ♦ PIONS ♦ POLARIZATION ♦ PRODUCTION ♦ PROTONS ♦ REACTION KINETICS ♦ RESONANCE ♦ SCATTERING ♦ SPIN ♦ SYNCHROTRONS ♦ TREIMAN-YANG TEST
Abstract Proton-proton scattering was studied at 970 Mev using a 1-Bev synchrotron and a 9-in.-diam. liquid-hydrogen bubble chamber; 3945 events were analyzed and cross sections determined for the various reactions. The elastic scattering cross section of 24.8 plus or minus 0.9 mb is significantly higher than the result of Dowell et al. using counters. The two experiments agree on the shape of the angular distribution, but not on its normalization; possible reasons for this are discussed. The elastic scattering angular distribution is peaked strongly forward, but does not agree quantitatively with pure diffraction. Polarization effects observed in the elastic scattering agree with previous and more accurate counter experiments. Inelastic scattering is strongly influenced by the (3/2,3/2,) pi /sup +/ resonance and the peripheral mechanism. Theoretical predictions based on the single-pion exchange model are compared in detail with the experimental results and good quantitative agreement is obtained for small momentum transfers, particularly, for the reaction p + p yields n + p + pi / sup +/. Even for small momentum transfers, asymmetries in the Treiman-Yang test and departure from the expected (1 + 3 cos/sup 2/ theta ) pi /sup +/- P angular distribution indicate that other mechanisms may be important. The cross section for double-pion production at 970 Mev is less than 0.2 mb. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1964-02-24
Journal Physical Review
Volume Number 133


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