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Photoproduction of. pi. /sup 0/ from hydrogen near the second pion nucleon resonance

Technical Report ·
OSTI ID:6682878
; ; ;
Pion photoproduction from nucleons has proved a useful tool in the study of the pion-nucleon interaction because of the dominance of the strong final-state interaction between emitted pion and recoil nucleon. There has remained, however, a noticeable lack of data at high momentum transfer in the region of the second pion-nucleon resonance. In particular, the zero angle measurement provides an important test of the hypothesis that the direct photo-electric term is responsible for the difference in position of this resonance in ..pi../sup 0/ and ..pi../sup + -/ photoproduction. The present experiment was designed to study this region using the Stanford Mark III linear accelerator. The results of the experiment establish that the discrepancy in resonance positions is not due to the photo-electric term, and also establish the possibility of a high momentum transfer enhancement of ..pi../sup 0/ photoproduction caused by crossed nucleon and nucleon isobar exchanges. The paper is divided into into five parts. In Section II, the experimental equipment and techniques are described. Section III contains an account of the data reduction, and the results are then interpreted in Section IV. Finally, in Section V, general conclusions are drawn.
Research Organization:
Stanford Univ., CA (USA). High-Energy Physics Lab.
OSTI ID:
6682878
Report Number(s):
AD-463449
Country of Publication:
United States
Language:
English

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Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON RESONANCES
BARYONS
BASIC INTERACTIONS
BEAMS
BOSONS
DATA
ELECTROMAGNETIC INTERACTIONS
ELECTRON BEAMS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
FINAL-STATE INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
KINETICS
LEPTON BEAMS
LINEAR ACCELERATORS
MESONS
N RESONANCES
NUCLEONS
NUMERICAL DATA
PARTICLE BEAMS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON-BARYON INTERACTIONS
PHOTON-HADRON INTERACTIONS
PHOTON-NUCLEON INTERACTIONS
PHOTON-PROTON INTERACTIONS
PHOTOPRODUCTION
PIONS
PSEUDOSCALAR MESONS
REACTION KINETICS
RESONANCE PARTICLES