  The parallel momentum distribution (PMD) of the residual nuclei of the
14O(p,pn)13O and 14O(p,2p)13N reactions at 100 and 200 MeV/nucleon in inverse
kinematics is investigated with the framework of the distorted wave impulse
approximation. The PMD shows an asymmetric shape characterized by a steep
fall-off on the high momentum side and a long-ranged tail on the low momentum
side. The former is found to be due to the phase volume effect reflecting the
energy and momentum conservation, and the latter is to the momentum shift of
the outgoing two nucleons inside an attractive potential caused by the residual
nucleus. Dependence of these effects on the nucleon separation energy of the
projectile and the incident energy is also discussed.
