arXiv:1504.03169·v1·Nuclear Experiment
Reduced quasifission competition in fusion reactions forming neutron-rich heavy elements
K. Hammerton · Z. Kohley · D. J. Hinde · M. Dasgupta · A. Wakhle · E. Williams · V. E. Oberacker · A. S. Umar · I. P. Carter · K. J. Cook · J. Greene · D. Y. Jeung
Abstract
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 be determined in a model-independent way. Previous experimental and theoretical studies had produced conflicting conclusions. The experimental MADs reveal an increase in contact time and mass evolution of the quasifission fragments with increasing (N/Z)CN, which is indicative of an increase in the fusion probability. The experimental results are in agreement with microscopic time-dependent Hartree-Fock calculations of the quasifission process. The experimental and theoretical results favor the use of the most neutron-rich projectiles and targets for the production of heavy and superheavy nuclei.
Comments: Accepted to PRC as a Rapid Communication