Abstract
For the 68Zn + 112Sn reaction the Coulomb parameter Z1Z2 is equal to 1500 that is close to the threshold value for the appearance of quasifission process. It was found that mass-energy distributions of the reaction fragments differ significantly from those obtained in the 36Ar + 144Sm reaction leading to the formation of the same composite system of 180Hg at similar excitation energies of about 50 MeV. In the case of the reaction with 68Zn ions, the mass distribution of fissionlike fragments has a wide two-humped shape with maximum yields at 70 and 110 u for the light and heavy fragments, respectively, instead of 80 and 100 u observed in the fission of 180Hg formed in the 36Ar + 144Sm reaction. The difference is explained by an unexpectedly large contribution (more than 70%) of quasifission in the case of the 68Zn + 112Sn reaction.
Highlights
Investigation of nuclei far from the valley of stability is one of modern nuclear physics’s primary goals
From the analysis of a large set of experimental mass-angular distributions of fissionlike fragments formed in the reactions with heavy ions [8], it was found that for the composite systems with ZCN = 80 the threshold value for the QF appearance is Z1 Z2 = 1450 ± 100
Z1 Z2 is the Coulomb factor, xm is the mean fissility parameter, α0 is the entrancechannel mass asymmetry, Elab and Ec.m. are the interaction energies in the laboratory and the center-of-mass (c.m.) systems, Ec.m./EBass is the relation to the Bass barrier of the reaction, E
Summary
Investigation of nuclei far from the valley of stability is one of modern nuclear physics’s primary goals. From the analysis of a large set of experimental mass-angular distributions of fissionlike fragments formed in the reactions with heavy ions [8], it was found that for the composite systems with ZCN = 80 the threshold value for the QF appearance is Z1 Z2 = 1450 ± 100.
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