Mechanism of He3(π-,pn) reaction

Phys. Rev. C 31, 2163 – Published 1 June 1985
T.-S. H. Lee


The π- absorption by He3 is investigated in a model study based on the nucleon pole mechanism πNN→NN→NN. We find that the amplitude of the three-body rescattering mechanism can have a strong interference effect with the amplitude of the direct two-body absorption process even in the region where the two-body process dominates. The main experimental signature of this important coherent effect is a sharp peak near the high energy end of the proton spectrum measured in a coincident experiment. Our results suggest that in order to extract the isospin dependence of pion absorption by a pair of nucleons from the recent He3(π±,NN) data, the three-nucleon rescattering amplitude must be calculated accurately and included coherently in the analysis.


  • Received 28 February 1985
  • Published in the issue dated June 1985

© 1985 The American Physical Society

Authors & Affiliations

T.-S. H. Lee

  • Argonne National Laboratory, Argonne, Illinois 60439

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