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Angular distribution of charge exchange and inelastic neutrons in π--p interactions at 313 and 371 MeV

Lind, Don L. and Barish, Barry C. and Kurz, Richard J. and Ogden, Philip M. and Perez-Mendez, Victor (1965) Angular distribution of charge exchange and inelastic neutrons in π--p interactions at 313 and 371 MeV. Physical Review, 138 (6B). B1509-B1517. ISSN 0031-899X. http://resolver.caltech.edu/CaltechAUTHORS:LINprb65

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Abstract

Neutron angular distributions from the charge-exchange (π0n) and inelastic modes (π0π0n,π+π-n) of the π--p interaction have been investigated at 313 and 371 MeV incident-pion kinetic energy. The data were obtained with an electronic counter system. Elastic and inelastic neutrons were separated in the all-neutral final states by time of flight. At both energies the charge-exchange differential cross section at the forward neutron angles differs from that determined by Caris et al. from measurements of the π0-decay gamma distributions, but generally agrees with the phase-shift-analysis calculations of Roper. The distribution of inelastic neutrons from both modes shows a strong preference for low center-of-mass neutron energies. The distribution of these neutrons does not correspond to that expected from the I=0, π-π interaction (ABC effect) suggested to account for the anomaly in p-d collisions observed by Abashian et al. Finally, all available charge-exchange differential-cross-section data from this and other experiments were combined by at least-squares fit to a Legendre expansion of the form dσ/dΩ*(cosθπ0*)=Σl=0NalPl(cosθπ0*) with the following results (in mb/sr): Tπ- a0 a1 a2 a3 313 1.21±0.03 1.88±0.06 1.61±0.06 0.45±0.06 371 0.89±0.02 1.57±0.04 1.13±0.04 0.38±0.03.


Item Type:Article
Additional Information:©1965 The American Physical Society. Received 11 February 1965. We would like to acknowledge the help, support, and encouragement received from Professor Burton J. Moyer throughout the course of this experiment. We are indebted to Dr. Julius Solomon for his assistance in the beam-optics calculations and to Dr. L. David Roper for his helpful discussions and cooperation in transmitting the results of his phase-shift analysis. We are grateful to Dr. T. D. Spearman for pointing out the limit on charge-exchange differential cross sections at 180 deg. Finally we would like to thank James T. Vale and the members of the cyclotron crew for their help and cooperation during this experiment.
Record Number:CaltechAUTHORS:LINprb65
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:LINprb65
Alternative URL:http://dx.doi.org/10.1103/PhysRev.138.B1509
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4982
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 Sep 2006
Last Modified:26 Dec 2012 09:03

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