Inclusive Pion Double Charge Exchange on Light Nuclei above 0.5 GeV

摘要

Inclusive double charge exchange (DCX) reaction A(w , ir+ )X on 6 Li and 1SO was for the first time measured at incident kinetic energy To = 1.1 GeV (< 9 > ~ 5°) for outgoing particle momentum region where additional pion production is kinematically forbidden. The experiment was performed at secondary tt~ beam of the ITEP proton synchrotron using the 3m magnet spec-trometer. The measured double differential cross section at 1.1 GeV together with our previous results at 0.6 and 0.75 GeV [1] and with the lower energy data [2] and [3] shows rather slow decrease with energy. This result is in contra-diction with the fast fall of small angle DCX cross section calculated [4] in the standard mechanism of two sequential single charge exchanges of pion on two like nucleons. Therefore, other approaches to DCX (for example, short range NN correlations, meson exchange currents, inelastic Glauber corrections etc.) are needed to explain the observed energy dependence.