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MULTIPLE PION PRODUCTION AT 2.0 Bev

Thesis/Dissertation ·
OSTI ID:4090343

A study of pion-proton interactions in a liquid H bubble chamber is reported. A 2.1 Bev/c negative pion beam incident upon a 14 in. dia. chamber caused interactions, from which those with 4 charged secondaries were selected and measured. Fits were attempted to the following final states: 3 pi plus or minus P, 3 pi + P + pi /sup o/, and 4 pi + n. By normalizing to a total cross section of 35.7 mb, the partial cross sections for the above listed final states are found to be 1.67 plus or minus 0.08, 1.17 plus or minus 0.06, and 0.37 plus or minus 0.02 mb. The 3 pi + P reaction was found to be dominated by the production of the 3/2-3/2 pion nucleon isobar. The cross section for this process is 0.53 plus or minus 0.05 mb. Evidence for the eta and omega mesons was found in the 3 pi + P + pi /sup o/ final state. Their cross sections are 0.037 plus or minus 0.015 and 0.26 plus or minus 0.035 mb, respectively. A Dalitz plot for eta decays is presented. Evidence is given for a double peak in the neutral 2-pion mass spectrum for 3 pi + P events. The peaks coincide with those attributed to the rho meson in other experiments. An attempt is made to calculate the pion-pion cross section by isolating events with low momentum transfer to the isobar. (Dissertation Abstr.)

Research Organization:
Originating Research Org. not identified
NSA Number:
NSA-18-009204
OSTI ID:
4090343
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

BEAMS
BUBBLE CHAMBERS
CHARGED PARTICLES
CROSS SECTIONS
DALITZ PLOT
DECAY
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ETA RESONANCES
GEV RANGE
HYDROGEN
INTERACTIONS
ISOSPIN
LIQUIDS
MASS
MEASURED VALUES
MOMENTUM
NEUTRONS
NUMERICALS
OMEGA RESONANCES
PARTICLE MODELS
PHYSICS
PIONS
PIONS-MINUS
PRODUCTION
PROTONS
RESONANCE
SPECTRA