Effects of nuclear correlations on low-energy pion charge-exchange scattering

E. R. Siciliano, M. D. Cooper, Mikkel B. Johnson, and M. J. Leitch
Phys. Rev. C 34, 267 – Published 1 July 1986
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Abstract

An isospin-invariant optical-potential framework is used to make a coordinated analysis of low-energy pion elastic and single- and double-charge-exchange scattering to isobaric analog states. The form of the potential studied here is motivated by the work of Stricker, McManus, and Carr, who emphasized the importance of isoscalar absorption-dispersive and correlation effects for low-energy pion elastic scattering. In this paper we examine the influence of the corresponding isovector and isotensor nuclear correlations on low-energy charge exchange. Comparison of our results to 50 MeV data supports the existence of the isovector correlation terms, but shows a need for an additional isotensor effect. A distorted-wave Born approximation analysis confirms that distortions are weak (the mean density of interaction is roughly 50% of the central value), but demonstrates that distortions of the pion waves by the nuclear medium cannot be neglected in describing charge exchange.

  • Received 3 February 1986

DOI:https://doi.org/10.1103/PhysRevC.34.267

©1986 American Physical Society

Authors & Affiliations

E. R. Siciliano

  • Department of Physics and Astronomy, University of Georgia, Athens, Georgia 30602 and Los Alamos National Laboratory, Los Alamos, New Mexico 87545

M. D. Cooper, Mikkel B. Johnson, and M. J. Leitch

  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545

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Vol. 34, Iss. 1 — July 1986

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