An extended time-dependent Hartree-Fock theory which incorporates the effects of nucleon-nucleon collisions into the mean field is presented and applied to head-on collisions of ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$${+}^{16}$O at low incident energies. Particularly investigated is the influence of nucleon-nucleon collisions on the low angular momentum limit for fusion which is predicted by time-dependent Hartree-Fock calculations. It is found that the threshold energy for the low angular momentum limit is dramatically increased because of nucleon-nucleon collision effects.

• Received 29 December 1986

DOI:https://doi.org/10.1103/PhysRevC.36.187