Abstract

Prompt emission of nucleons is observed in time-dependent Hartree-Fock calculations of $^{16}\mathrm{O}$+$^{93}\mathrm{Nb}$ collisions. These nucleons are emitted in the forward direction in about 2\ifmmode\times\else\texttimes\fi{}10$^{\ensuremath{-}22}\mathrm{s}$ after the contact of the ions, with a mean velocity somewhat less than the beam velocity. At $E(\mathrm{lab})=204$ MeV, the estimated total nucleon cross section is \ensuremath{\sim}230 mb. For central collisions a lower energy threshold of 130 MeV is established. Force dependence of the results is studied in detail.

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