Abstract
The energy dependence of forward double charge exchange (DCX) reaction is studied for the doubly closed shell nuclei 16O and 40Ca. A common characteristic of the two DCX reactions is a resonance-like peak around 50 MeV pion lab energy. While some authors have interpreted this peak as the evidence of a dibaryon resonance state, we show that it arises naturally in a two-step process in the conventional pion—nucleon system with proper handling of nuclear structure. The effects of nuclear structure are demonstrated through a comparison among different nuclear structure models: the symmetry model SU(4) ⊗ SU(3), the single particle shell model and the «realistic” shell model.
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