Experiments on the Nuclear Interactions of Pions and Electrons

Abstract

SUMMARYThis is the final technical report. Yearly Progress Reports were submitted throughtout the duration of the project. Along with our publications, these reports provide a detailed record of our accomplishments. This report largely consists of a summary of the technical activities carried out during last 2-1/2 years of the project. Our work during these years centered primarily around experiments using the CLAS detector at the Thomas Jefferson Laboratory (JLab), for which R. Minehart was a co-spokesman.The following is a summary of the projects supported by our DOE grant:1. Electro-production of excited states of the nucleon through the analysis of exclusive single pion production reactions induced by polarized electrons incident on both polarized and unpolarized nucleon targets. The experimental measurements were made at JLab.2. Measurement of proton and deuteron spin structure functions in and above the nucleon resonance region at low and moderate Q 2 , using inclusive e p and e d scattering. The measurements were made at JLab.3. A precise measurement of the branching ratio for pion beta decay was carried out along with other members of the PIBETA collaboration. The measurements were made at the PSI Laboratory in Switzerland. The technical aspects of the detector constructed for this project was published in Nuclear Instruments and Methods. The scientific results were published in articles in the Physical Review Letters.