2,156 research outputs found
Isospin dependence of mass-distribution shape of fission fragments of Hg isotopes
Using an improved scission-point model, the mass distributions are calculated for induced fission of even Hg isotopes with mass numbers A=174 to 196. With increasing A of a fissioning AHg nucleus the mass distribution evolves from symmetric for 174Hg, to asymmetric for isotopes close to 180Hg, and back to more symmetric for 192,194,196Hg. In the fissioning Hg isotopes their excitation energy weakly influences the shape of the mass distribution. In 180,184Hg, the mass distributions of fission fragments remain asymmetric even at high excitation energies
Treatment of competition between complete fusion and quasifission in collisions of heavy nuclei
A model of competition between complete fusion and quasifission channels in
fusion of two massive nuclei is extended to include the influence of
dissipative effects on the dynamics of nuclear fusion. By using the
multidimensional Kramers-type stationary solution of the Fokker-Planck
equation, the fusion rate through the inner fusion barrier in mass asymmetry is
studied. Fusion probabilities in symmetric 90Zr+90Zr, 100Mo+100Mo, 110Pd+110Pd,
136Xe+136Xe, almost symmetric 86Kr+136Xe and 110Pd+136Xe reactions are
calculated. An estimation of the fusion probabilities is given for asymmetrical
62Ni+208Pb, 70Zn+208Pb, 82Se+208Pb, and 48Ca+244Pu reactions used for the
synthesis of new superheavy elements.Comment: 29 pages, LaTeX, including 7 postscript figures, to appear in Nucl.
Phys.
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