Abstract

Charge variances for 154Sm+154Sm collisions are reproduced fairly well up to an energy loss of approximately 80 MeV in a Monte-Carlo simulation of the dynamical nucleon-exchange model in heavy-ion collisions. For 144Sm+144Sm good agreement with the experimental data on the charge variances is obtained up to the same energy loss once corrections due to neutron shell closure effects are included. The mass variances are, however, very much underestimated. It is speculated that such seemingly anomalous behaviour may have its origin in the coexistence with nucleon exchange of the random rupture of the neck established in the dinuclear complex.

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