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p-p INTERACTIONS AT 2 Bev. I. SINGLE-PION PRODUCTION

Journal Article · · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
OSTI ID:4792585
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An analysis of 3600 two-pronged events, obtained in p-p interactions at 2 Bev in the BNL 20-in. hydrogen bubble chamber, was made. Cross sections were measured for elastic scattering, for the two modes of single-pion production, p + p yields p + n + pi /sup +/, p + p yields p + p + pi /sup 0/ and for strange particle production. The branching ratio for the two one pion production reactions is sigma (pn pi /+sup 0/) = 4.17 plus or minus 0.25 Momentum distributions and Q values indicate that singlepion production proceeds almost entirely through the of the extended isobar model and also a one-pion exchange model for production. The branching ratio and momentum distributions can be explained by including a small effect from the I = 1/2 resonant state in addition to the dominant I =3/2 resonance. The c.m. angular distribution of the nucleons in single-pion production shows very marked backward-forward peaking indicating a one-pion exchange mechanism. Absolute differential cross sections as a function of laboratory kinetic energy were calculated from Selleri's equation for the pn pi reaction. There is sgreement with the data for low four-momentum transfers ers the theoretical are larger than the experimental cross sections. (auth)
Research Organization:
Yale Univ., New Haven; Brookhaven National Lab., Upton, N.Y.
NSA Number:
NSA-16-015570
OSTI ID:
4792585
Report Number(s):
BNL-5725; 0031-899X
Journal Information:
Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 125; ISSN PHRVA
Country of Publication:
United States
Language:
English

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Related Subjects

ANGULAR DISTRIBUTION
BRANCHING RATIO
BUBBLE CHAMBERS
CROSS SECTIONS
DECAY
DIFFERENTIAL EQUATIONS
DISTRIBUTION
ENERGY
ENERGY RANGE
GEV RANGE
HYDROGEN
INTERACTIONS
ISOBARIC MODEL
MEASURED VALUES
MOMENTUM
NEUTRONS
NUMERICALS
OPE MODEL
PARTICLE MODELS
PARTICLE TRACKS
PHYSICS
PIONS
PIONS-NEUTRAL
PIONS-PLUS
PRODUCTION
PROTONS
Q-VALUE
REACTION KINETICS
RESONANCE
SCATTERING
STRANGE PARTICLES