Electroproduction of charged pions from light nuclei to discrete final states

Thesis/Dissertation · Sat Jan 01 04:00:00 EST 1983

OSTI ID:5479708

Sabutis, J L

Electroproduction of charged pi mesons from light nuclei to discrete final states is studied in the distorted wave impulse approximation. The Blomqvist and Laget pion photoproduction operator is extended to the case of electroproduction by including virtual photons. Gauge invariance is included in the theory by making the Feynman diagrams for the process individually gauge invariant. Conservation of the electromagnetic current and isolation of the electron's kinematical aspects are done through the introduction of modified polarization vectors. The contribution to the cross section from the virtual photon's transverse components of polarization is constrained by using the original Blomqvist and Laget Magnetic coupling to the ..delta../sub 33/. The virtual photon's longitudinal component is allowed to couple to the ..delta../sub 33/ through a Longitudinal term. The single nucleon virtual photoproduction cross sections, with the inclusion of the Longitudinal term, agree with the data. The integrated cross section for p(e,..pi../sup +/)n experiments are calculated and the analytical formula for the virtual photon spectrum of Wright and Tiator is confirmed in detail. Contribution of the longitudinal component of virtual photon to the cross section proves to be small for single arm experiments at electron inelasticities greater than 0.1 and near the electron end point. Pion distortions are included through an optical potential. The single arm electroproduction cross sections of positive pions for the targets /sup 10/B and /sup 12/C are calculated. For the /sup 10/B case, good agreement with data is found. For the /sup 12/C cross sections, no conclusion is reached because the quality of the present data is poor.

• Research Organization: Pittsburgh Univ., PA (USA)
• OSTI ID: 5479708
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BORON 10 TARGET
BOSONS
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIAGRAMS
DISTORTED WAVE THEORY
ELECTRON REACTIONS
ELEMENTARY PARTICLES
FEYNMAN DIAGRAM
FINAL-STATE INTERACTIONS
HADRONS
HYDROGEN 1 TARGET
IMPULSE APPROXIMATION
INFORMATION
INTERACTIONS
LEPTON REACTIONS
MESONS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE PRODUCTION
PIONS
PIONS PLUS
PSEUDOSCALAR MESONS
TARGETS
THEORETICAL DATA