Kinematically complete measurement of the (π±,π±p) reaction on C12 at 220 MeV

J. A. Faucett, B. E. Wood, D. K. McDaniels, P. A. M. Gram, M. E. Hamm, M. A. Oothoudt, C. A. Goulding, L. W. Swenson, K. S. Krane, A. W. Stetz, H. S. Plendl, J. Norton, H. Funsten, and D. Joyce
Phys. Rev. C 30, 1622 – Published 1 November 1984
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Abstract

The C12(π±,π±p) reactions were studied at Tπ=220 MeV. The final particles were detected both separately and in coincidence and their momenta were measured. Calculation of the excitation energy of the residual nucleus allowed clear separation of events where an outer proton was removed. The data provide detailed evidence confirming the quasielastic picture of pion knockout reactions. Evidence for this derives from the agreement between the peak energies found in the coincidence spectra and those found in inclusive spectra, from analysis of angular distributions, and from the location of peaks found in missing mass spectra. The coincidence cross section is found to account for about half of the (π+,π+) reaction, and about half of this in turn corresponds to quasifree knockout of the outer shell protons. Secondary processes in the (π,πp) reaction are found to play a much more important role than in the (π+,π+p) reaction.

  • Received 21 February 1984

DOI:https://doi.org/10.1103/PhysRevC.30.1622

©1984 American Physical Society

Authors & Affiliations

J. A. Faucett*, B. E. Wood, and D. K. McDaniels

  • University of Oregon, Eugene, Oregon 97403

P. A. M. Gram, M. E. Hamm, and M. A. Oothoudt

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

C. A. Goulding

  • University of Texas at Austin, Austin, Texas 78712

L. W. Swenson, K. S. Krane, and A. W. Stetz

  • Oregon State University, Corvallis, Oregon 97331

H. S. Plendl and J. Norton

  • Florida State University, Tallahassee, Florida 32306

H. Funsten and D. Joyce

  • College of William and Mary, Williamsburg, Virginia 23185

  • *Present address: New Mexico State University, Las Cruces, NM 88003.
  • Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.
  • Present address: Technical Programming Services, P.O. Box 5247, Pleasanton, CA 94566.

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Issue

Vol. 30, Iss. 5 — November 1984

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