Pion-induced pion production in nuclei

F. Bonutti, P. Camerini, E. Fragiacomo, N. Grion, R. Rui, J. T. Brack, L. Felawka, E. F. Gibson, G. Hofman, M. Kermani, E. L. Mathie, S. McFarland, R. Meier, D. Ottewell, K. Raywood, M. E. Sevior, G. R. Smith, and R. Tacik (The CHAOS Collaboration)
Phys. Rev. C 55, 2998 – Published 1 June 1997
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Abstract

The process of pion-induced pion production in nuclei has been studied with the A(π+,π+π) and A(π+,π+πp) reactions for four nuclei 2H, 12C, 40Ca, and 208Pb at an incident pion energy of Tπ+=283 MeV. The π+π and π+πp particles in the final state were detected in coincidence with the CHAOS spectrometer at TRIUMF. By looking at kinematic quantities such as missing momentum and missing energy, we have been able to draw some model-independent conclusions about the dynamics of the πππ process in nuclei, which do not vary significantly with target mass. We find that the incident pion interacts mainly with one surface nucleon via the leading πNππN channel. The pion pair releases no appreciable energy to the residual nucleus, which remains substantially bound throughout the reaction. These findings underline the quasifree nature of the pion production reaction in nuclei.

  • Received 19 December 1996

DOI:https://doi.org/10.1103/PhysRevC.55.2998

©1997 American Physical Society

Authors & Affiliations

F. Bonutti1,2, P. Camerini1,2, E. Fragiacomo1,2, N. Grion1, R. Rui1,2, J. T. Brack3,8, L. Felawka2, E. F. Gibson6, G. Hofman3,4, M. Kermani3,4, E. L. Mathie5, S. McFarland3,4, R. Meier3, D. Ottewell3, K. Raywood3, M. E. Sevior7, G. R. Smith3, and R. Tacik5

  • 1Istituto Nazionale di Fisica Nucleare, 34127 Trieste, Italy
  • 2Dipartimento di Fisica dell’Universita’ di Trieste, 34127 Trieste, Italy
  • 3TRIUMF, Vancouver, British Columbia, Canada V6T 2A3
  • 4Physics Department, University of British Columbia, Vancouver, British Columbia, Canada V6T 2A6
  • 5University of Regina, Regina, Saskatchewan, Canada S4S 0A2
  • 6California State University, Sacramento, California 95819
  • 7School of Physics, University of Melbourne, Parkville, Victoria, 3052, Australia
  • 8University of Colorado, Boulder, Colorado 80309

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Vol. 55, Iss. 6 — June 1997

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