Abstract

The longitudinal velocity ν | of the composite system formed in intermediate-energy heavy-ion reactions is frequently obtained from the mean forward recoil range, FW, of evaporation residues, a procedure that neglects the effect of evaporation. The validity of this approach is examined with the help of the cascade-evaporation code ISABEL-EVA. The results for 45–90 MeV/nucleon 12C on copper and silver indicate that ν | is overestimated by at most (6 ± 3)%. The magnitude of this is related to the experimentally observable ratio of forward and backward ranges.

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