Journal
PHYSICAL REVIEW C
Volume 77, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.77.024606
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Fission fragment mass-angle correlations and mass ratio distributions have been measured for the reactions O-16+Os-186, Mg-24+Hf-178, S-34+Er-168, and Ti-48+Sm-154, forming the Po-202 composite nucleus, at near barrier energies. Systematic analysis based on the expected dependence of the variance of the mass distribution on the angular momentum and temperature of the compound nucleus indicate that the two lighter systems evolve through true compound nucleus fission. Evidence of quasifission was observed for the two most mass-symmetric reactions, through strong mass-angle correlations for the Ti-48+Sm-154 reaction and a broadened mass ratio distribution for the S-34+Er-168 reaction. Furthermore, the increase in mass width at near barrier energies shows the influence of the alignment of statically deformed target nuclei.
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