Quasielastic knockout of light fragments from 12 C and 16 O nuclei by intermediate-energy pions

Quasielastic deuteron and triton knockout from 12 C and 16 O nuclei has been studied infull kinematics using a 0.72-GeV/ c pion beam. The momentum distributions of the intranuclear quasideuteron motion, excitation-energy spectra of the residual nuclei, and the effective numbers N d eff of quasideuterons are determined. The parameters of the quasideuteron intranuclear motion are in reasonable agreement with the results obtained in other beams. The N d eff in the nuclei from 6 Li to 16 O measured in full kinematics are virtually independent of the atomic number in contrast to the analogous values in the inclusive deuteron-knockout reaction induced by protons. The phenomenon of triton knockout from these nuclei is observed, which makes possible estimation of the cross section of backward pion-triton elastic scattering in yet unexplored regions of energy and momentum transfer.