Interference effects in (π,πN) reactions

Abstract

Contributions of quasifree and nonquasifree reaction processes to (m,~N) reactions have been investigated across the (3,3) resonance region. %'e demonstrate that the quantum mechanical interference between these two types of reaction processes significantly affects the calculated m.and n.+induced cross sections, as well as their ratio. In the case of incident m, the contributions from the interference term even exceed those from the pure nonquasifree term. This investigation of the (m, m. N) reaction thus indicates that the interpretations given to the parameter introduced into various published semiclassical models, in which interference effects were ignored, are incorrect.

Eta-mesic nuclei: Past, present, future

“…For example, researchers were once puzzled by the observed "abnormal" cross-section ratios σ[ 12 C(π + , πN)]/σ[ 12 C(π − , πN)] in the ∆(1232) region. The observed ratios were later well explained when the interference between quasifree and nonquasifree reaction amplitudes was taken into account by Ohkubo and Liu [63].…”