(π,p) reactions at low excitation energy

G. S. Blanpied, C. S. Mishra, G. S. Adams, B. M. Preedom, and C. S. Whisnant, J. -P. Egger, C. L. Morris, H. Breuer, N. S. Chant, B. G. Ritchie, B. H. Wildenthal, B. Höistad, and B. A. Brown
Phys. Rev. C 35, 1567 – Published 1 April 1987
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Abstract

Results of the first experimental search for the excitation of discrete final states following exclusive (π,p) reactions are reported. The measurements include differential cross section at thetalab=25° for (π±,p) reactions on Mg24, Al27, Ca40, and Ni58 at Tπ=120 MeV and (π,p) on C12 at Tπ=145 MeV. The (π,p) reactions yield peaks with dσ/dΩ≤1 μb/sr compared to 722 μb/sr for peaks from (π+,p) reactions. The shape of the continuum in an excitation energy range of 1040 MeV was found to be independent of pion charge and target. The ratios of (π+,p)/(π,p) averaged over excitation energy and the ratios of the same reaction on different nuclei are presented. The magnitude of the proton yield in the low excitation continuum is more than 20 times larger for π+ than for π, which supports a two-nucleon absorption model including pion charge exchange.

  • Received 22 December 1986

DOI:https://doi.org/10.1103/PhysRevC.35.1567

©1987 American Physical Society

Authors & Affiliations

G. S. Blanpied, C. S. Mishra, G. S. Adams, B. M. Preedom, and and C. S. Whisnant

  • Department of Physics, University of South Carolina, Columbia, South Carolina 29208

J. -P. Egger

  • Institute de Physique, Université de Neuchtel, CH-2000 Neuchtel, Switzerland

C. L. Morris

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

H. Breuer, N. S. Chant, and B. G. Ritchie

  • Department of Physics, University of Maryland, College Park, Maryland 20742

B. H. Wildenthal

  • Department of Physics and Atmospheric Science, Drexel University, Philadelphia, Pennsylvania 19104

B. Höistad

  • Gustaf Werner Institute, University of Uppsala, S-75121 Uppsala, Sweden

B. A. Brown

  • Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824

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Issue

Vol. 35, Iss. 4 — April 1987

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