Abstract
The “resonant-enhancement” effect observed in deuteron breakup by intermediate-energy pions is treated in the impulse approximation. It is shown that a broad enhancement in the energy region 60–80 MeV in the cumulative neutron spectrum consists of sharp peaks at fixed neutron angles. This corresponds to the domination of quite definite three-particle configurations with given momenta of all particles. As a consequence there are sharp peaks in the nucleon-nucleon effective mass spectrum which imitate dibaryon resonances. The position of the peak in the momentum spectrum for these configurations slowly tends to a constant limit dependent on the particle masses after an initial rise in energy. Different applications of the effects considered are discussed.
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