Elsevier

Nuclear Physics A

Volume 322, Issues 2–3, 18–25 June 1979, Pages 493-511
Nuclear Physics A

The case for studying the (π, πN) reaction in coincidence under optimum conditions

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Abstract

The formalism for pion quasi-elastic scattering is reviewed with reference to the validity of certain common assumptions. It is argued that the difficulties associated with factorization are greatly reduced for knock-out from a specific nuclear state, in comparison with (for example) the first-order optical potential. Optimum conditions for a coincidence measurement are discussed. Explicit calculations for the case of the (π+, π+p) reaction suggest that, while off-shell effects are very small, the Pauli exclusion principle has large qualitative effects throughout the (3,3) resonance region. It is of considerable interest to verify this experimentally.

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    Present address: SRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK.

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