Pion absorption by He3 at the Δ-resonance energy

S. Mukhopadhyay, S. Levenson, R. E. Segel, G. Garino, D. Geesaman, J. P. Schiffer, G. Stephans, B. Zeidman, E. Ungricht, H. Jackson, R. Kowalczyk, D. Ashery, E. Piasetsky, M. Moinester, I. Navon, L. C. Smith, R. C. Minehart, G. S. Das, R. R. Whitney, R. Mckeown, B. Anderson, R. Madey, and J. Watson
Phys. Rev. C 43, 957 – Published 1 March 1991
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Abstract

Pion absorption by He3 was studied at Tπ=165 MeV in a kinematically complete experiment. The cross section for absorption on a (pn) pair of nucleons, σpn(π+), was found to be 17.0±2.6 mb; that for absorption on a (pp) pair, σpp(π), 0.91±0.20 mb. The angular distribution in the πNN center-of-mass system for σpn(π+) resembles that for the π++dp+p reaction while the angular distribution for σpp(π) is strongly backward peaked. Evidence that a significant fraction of the absorptions involves all three target nucleons is seen in the angular correlation between the two detected nucleons as well as in the momentum distribution of the unobserved nucleon. For π+ and π absorption, the three-body cross sections were found to be 9.6±2.1 and 4.2±01.2 mb, respectively. Neither initial- nor final-state interactions appear to be major contributors to the observed three-body absorption, though initial-state interactions may be contributing to the enhancement of the three-body π+ absorption at the Δ resonance.

  • Received 29 October 1990

DOI:https://doi.org/10.1103/PhysRevC.43.957

©1991 American Physical Society

Authors & Affiliations

S. Mukhopadhyay, S. Levenson, R. E. Segel, and G. Garino

  • Northwestern University, Evanston, Illinois 60201

D. Geesaman, J. P. Schiffer, G. Stephans, B. Zeidman, E. Ungricht, H. Jackson, and R. Kowalczyk

  • Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

D. Ashery, E. Piasetsky, M. Moinester, and I. Navon

  • Department of Physics, Tel-Aviv University, Ramat Aviv, Israel 69978

L. C. Smith, R. C. Minehart, G. S. Das, and R. R. Whitney

  • Department of Physics, University of Virginia, Charlottesville, Virginia 22901

R. Mckeown

  • Department of Physics, California Institute of Technology, Pasadena, California 91125

B. Anderson, R. Madey, and J. Watson

  • Kent State University, Kent, Ohio 44242

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Vol. 43, Iss. 3 — March 1991

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