Recoil studies of the reaction 12C(p,pn)11C from threshold to 85 MeV

In order to survey the features of the simple 12C(p,pn)11C reaction from threshold to 85 MeV, data were obtained for average projected ranges of 11C along and perpendicular to the beam direction. The data from threshold to 45 MeV provide evidence for a large momentum transfer mechanism of the compound nucleus type. In the 45–85 MeV energy region the data were analyzed in terms of a vector model consistent with the cascade–evaporation mechanism. More detailed information regarding differential ranges and angular distributions are needed if the recoil parameters are to provide conclusive results.