The effective moment of inertia, charge density distributions of the fissioning nucleus ~(170)Yb and ~(254)Fm at saddle point are calculated by using the continuous medium model with variable densities.
The isospin effect of particle emission for fissioning isobaric sources 110 Tc, 110Pd, 110In and for isotopic sources of 110,117,124 In were investigated within the framework of the Smoluchowski equation.
The results arc compared with the experimental data. This shows that under the present approximation the "anomalously" small K_0~2 of fissioning nuclei in the uranium region at low excitation energy (Ecxc≤15 MeV) can be explained by introduction of the pairing effects in nuclei. Furthermore, the absence of the "anomalous" phenomena for fissioning nuclei near the lead region may be qualitatively interpreted by means of the dependence of pairing effects on angular momentum.
The dynamical calculation of quasi fission reaction induced by 10.6MeV/u 84 Kr on 27 Al is performed using one body dissipation model. The calculation suggests a fission time larger than 200×10 -22 sec. It is found that the threshold for emergence of quasi fission in the reactoin system is 8 MeV/u.
In addition to the main process of binary fission, three branches of collinear three-body disintegration, which are associated with various mechanisms of the excitation of a deformed fissioning nucleus, are observed.
The analysis performed reveals that the coordinate-independent reduction coefficient ks is not compatible with the simultaneous description of the main fission characteristics for fissioning systems heavier than 224Th.
It is emphasized that angular anisotropy and various angular correlations of fission products are possible only if the fissioning nucleus remains nonthermalized during all the stages of fission from the saddle point to scission.
In contrast to prompt neutrons, scission neutrons are expected to mostly depend on the characteristics of the fissioning nucleus and, in particular, on its neutron number N.
The analysis is done for five compound nuclear systems representing heavy fissioning nuclei, medium fissioning nuclei, and a light fissioning one with the angular momentum varied in a wide range from l = 0 to 70?.