Three-Body Partial-Wave Analysis for the Final-State Scattering of (π−,NN) fromC12andO16

A nonrelativistic three-body treatment in the Born approximation is used for the final-state nucleon-nucleon scattering in the field of the residual nucleus, following the absorption of a bound pion in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$. It is shown that the $\mathrm{NN}$ energy distributions represent a very sensitive probe of the nuclear two-body force and of the stronger optical potential which serves to descibe multiple-scattering effects.