Description of Low-Energy Pion Double Charge Exchange Reactions
A new sequential model for low energy pion double charge exchange on nuclei is presented. We consider pion double charge exchange to be the second-order perturbation process in the s- and p- wave pion nucleon interaction Hamiltonian considering exactly the intermediate nuclear states. To our knowledge, this is the first sequential model showing that intermediate nucleus spectra could be the source of resonant-like structures in the double charge exchange amplitudes. A possible connection with the experimentally observed sharp peaks in the energy dependence of the double charge exchange cross section at T π ≈ 50 MeV is discussed.
KeywordsDifferential Cross Section Sequential Model Intermediate Nucleus Quasiparticle Random Phase Approximation Double Charge Exchange
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