Effects of the pion-nucleon interaction range on pion-nucleus double-charge-exchange reactions

The ( pi ⁺, pi ^-) reactions leading to the double isobaric analogue state (DIAS) have been studied at pion energies 50 to 300 MeV, with ¹⁴C as an example. The emphasis of the study has been on the effects of the pion-nucleon interaction range on the calculated double-charge-exchange (DCX) cross sections. The authors found that both the propagation of the intermediate pi ⁰ and the nucleon-nucleon correlation at short distances are strongly affected by the non-locality of the pi N interaction. Consequently, DCX reactions may be used to distinguish between different pi N interaction models.