Energy dependence of pion double charge exchange

The energy dependence of forward angle pion double charge exchange is calculated in the energy range of 0‐250 MeV. The most striking feature is a peak around 40 MeV which is in excellent agreement with the data when distorted waves obtained from a realistic optical model are used. Two possible short-range corrections to the reaction mechanism are addressed. @S0556-2813~98!07410-X#