Barish, Barry C. and Kurz, Richard J. and Perez-Mendez, Victor and Solomon, Julius (1964) Inelastic π--p Interactions in the Energy Region of 310 to 454 MeV. Physical Review, 135 (2B). B416-B431. ISSN 0031-899X http://resolver.caltech.edu/CaltechAUTHORS:BARpr64b
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Differential cross sections for positive pions, protons, and neutrons resulting from inelastic π--p collisions have been measured from 310- to 454-MeV incident-pion kinetic energy. The data were obtained with electronic counter systems, which measured the energy distribution of the final-state particle of interest at a series of fixed angles. The results have been interpreted in terms of the final states π+π-n, π0π0n, and π-π0p. The total cross sections for these three modes as a function of incident pion energy are in qualitative agreement with the predictions by Schnitzer. A preference is shown for his set of π-π scattering lengths; a0=0.65, a1=0.07, and a2=-0.14μ-1. The observed neutron distributions correspond to a strong preference for low c.m.-system neutron energies in both the π+π-n and π0π0n final states. The effect is not present in the observed proton distributions from the π-π0p reaction, which suggests that it is due to a I=0, π-π interaction. The π+ data show the formation of the (3,3) isobar combination of the π--n system in the π+π-n final state. Analysis in terms of an isobar model indicates the predominance of I=1/2 incident state.
|Additional Information:||©1964 The American Physical Society. Received 11 March 1964. We would like to acknowledge the help, support, and encouragement received from Professor A.C. Helmholz and Professor J.B. Moyer throughout the course of this work. The participation of Dr. Paul G. McManigal in the early phases and the assistance of Howard Goldberg in setting up the experiments and taking data are greatly appreciated. Finally we would like to thank James Vale and the members of the cyclotron crew for their help and cooperation during these experiments.|
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