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 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 influence of angular momentum in the context of isospin effects on the emission of different light particles for heavy fissioning isotopic sources of 189,202,212Po and for isobaric sources of 202Fr, 202Po and 202Tl is studied within the framework of the Smoluchowski equation.
对一个同量异位素链2 0 2 Fr,2 0 2 Po ,2 0 2 Tl和一个同位素链189,2 0 2 ,2 12 Po ,用裂变扩散模型考察了角动量对裂变前粒子发射同位旋效应的影响 .
The formula well reproduces the general trends of experimental data for a wide range of fissioning nuclides from Ac to Cf with excitation energies from spontaneous fission to 45 MeV alpha particles induced fission.
Fission-track ages for these samples range from 9．6±0．8 to 89．2±2．3 Ma with mean track lengths varying from 7．9±3．7 to 11．6±1．9 μm. The apatite fission track ages from various geographical regions suggest difference in styles of cooling during the Mesozoic－Cenozoic.
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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?.