[en] The collective behavior of up to 6 target electrons emitted in a single collision of 5.9 MeV/u U⁶⁵⁺ with Ne was investigated using high-resolution recoil-ion momentum spectroscopy (RIMS). With increasing number of ejected electrons the recoil-ions are increasingly scattered into the backward direction, providing evidence that the electrons are emitted into the forward hemisphere. Their mean longitudinal sum-energy varies from about 5 eV for single ionization up to 1.1 keV for Ne⁶⁺. Experimental recoil-ion momentum distributions are in excellent agreement with results of classical many-particle calculations. (orig.)