Multiproton final states in positive pion absorption below the Δ(1232) resonance

R. A. Giannelli, B. G. Ritchie, J. M. Applegate, E. Beck, J. Beck, A. O. Vanderpool, C. L. Morris, M. Rahwool-Sullivan, M. K. Jones, R. D. Ransome, M. Yadav, D. L. Watson, K. O. Oganesjan, E. A. Pasyuk, F. F. Guber, and A. I. Reshetin
Phys. Rev. C 61, 054615 – Published 20 April 2000
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Abstract

Inclusive cross sections for positive pion absorption leading to final states including two or more protons have been measured with a large solid angle detector for incident pion energies from 30 to 135 MeV for targets with A=2208. The mass dependences for the inclusive (π+,2p), (π+,3p), and total absorption cross sections for multiproton final states were found to be proportional to An with n0.5. These cross sections also were observed to have an energy dependence at energies below 150 MeV reflective of the importance of the Δ(1232) resonance, similar to that observed for πdpp. The inclusive cross sections for (π+,4p) were found to be less than 10 mb for all targets at all energies. Estimates were also obtained for cross sections for pion absorption leading to 2p1n and 3p1n final states. Quasideuteron absorption contributions increase slowly with A, and the energy dependence of those contributions mirrors that for πdpp. The data obtained here for multiproton final states indicate that a significant fraction of absorption events, increasing with A, most likely arises from final states containing fewer than two protons.

  • Received 9 July 1998

DOI:https://doi.org/10.1103/PhysRevC.61.054615

©2000 American Physical Society

Authors & Affiliations

R. A. Giannelli, B. G. Ritchie, J. M. Applegate, E. Beck*, J. Beck, and A. O. Vanderpool

  • Arizona State University, Tempe, Arizona 85287-1504

C. L. Morris and M. Rahwool-Sullivan

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

M. K. Jones, R. D. Ransome, and M. Yadav

  • Rutgers University, Piscataway, New Jersey 08855

D. L. Watson

  • University of York, York YO10 5DAD, United Kingdom

K. O. Oganesjan§ and E. A. Pasyuk

  • Joint Institute for Nuclear Research, Dubna, Moscow Region 141980, Russia

F. F. Guber and A. I. Reshetin

  • Institute for Nuclear Research of the Russian Academy of Science, Moscow 117312, Russia

  • *Present address: Phillips Laboratory, Kirkland AFB, Albuquerque, NM 87117-5776.
  • Present address: Department of Physics, University of Washington, Seattle, WA 98195-4290.
  • Present address: Department of Physics, College of William and Mary, Williamsburg, VA 23187-8795.
  • §Deceased.
  • Present address: Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504.

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Vol. 61, Iss. 5 — May 2000

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