Measurements of mass-angle distributions (MADs) for Cr + W reactions,providing a wide range in the neutron-to-proton ratio of the compound system,(N/Z)CN, have allowed for the dependence of quasifission on the (N/Z)CN to bedetermined in a model-independent way. Previous experimental and theoreticalstudies had produced conflicting conclusions. The experimental MADs reveal anincrease in contact time and mass evolution of the quasifission fragments withincreasing (N/Z)CN, which is indicative of an increase in the fusionprobability. The experimental results are in agreement with microscopictime-dependent Hartree-Fock calculations of the quasifission process. Theexperimental and theoretical results favor the use of the most neutron-richprojectiles and targets for the production of heavy and superheavy nuclei.
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