An attempt to evaluate the values of cross sections for the 68Zn (p,2p)67Cu reaction using model calculations

Excitation functions for the 68Zn (p,2p)67Cu reaction have been calculated (from threshold up to 120 MeV) using a hybrid model based of nuclear reaction in the form of computer codes Overlaid Alice and Alice 85/300. In this model the nucleon-nucleus interaction is treated a proceeding through a preequilibrium phase followed by nuclear evaporation. Using this model we hoped that below a proton energy of 100 MeV in the (p,2p) reaction both protons can be emitted in the preequilibrium stage. The calculated excitation functions for the 68Zn (p,2p)67Cu reaction have been compared with their literature values (Ep = 20 - 400 MeV). Unfortunately both codes completely fail to explain the discrepancies between the experiment and the calculations. The disagreement seems to indicate that the calculation does not account for the contribution of direct processes. (author). 13 refs, 1 fig., 1 tab