A first measurement is reported on coincident fast protons and neutrons evaporated by fragments detected in the incident beam direction. For all targets, the proton coincidence ratio is shown to increase with fragment velocity loss. This increase is correlated to the decrease of the fragment yield, with the coincidence ratio doubling when the yield decreases by a factor of 10. The coincidence ratio is found to also be proportional to the fragment mass loss for fragments with the beam velocity. A two-step mechanism is sketched out to describe these results.