Research Of Fission Fragments' Average Total Kinetic Energy Distribution Based On Di-nuclear Model

At present,the controllable nuclear energy is basically from the nuclear fission en-ergy.The energy released by the nuclear fission is composed of the kinetic energy and excitation energy of the light and heavy fragment,the kinetic energy of the fission neu-tron,the energy of ?-ray and ?-ray,the kinetic energy of the light and heavy fragment is the main part that is about 85%of the energy.The total kinetic energy distribution of fission fragment has a double peak shape,when A = 132 and A = 120,the total kinetic energy has a peak,and the fission symmetry point has a obviously concave;The total kinetic energy distribution is closely related to the fission process,mass distribution.charge distribution,neutron number and so on.However,at home and abroad,there is still no suitable theory to describe the physical quantities at the same time.Therefore,the study of the average total kinetic energy distribution of fragment has practical ap-plication value and academic significance.In this paper,the spontaneous bifurcation of 252 Cf is a research object,and a Di-nuclear theoretical model is constructed to try to quantitatively describe the aver-age kinetic energy distribution of fission fragments.Without considering the specific fission process,the model think that:(1)at the point of scission.initial fragments pairs exist through the form of ellipsoid,coaxial,point-to-point,and the kinetic energy of the fragments mainly comes from the two Coulomb repulsive effect,the two initial fragments in the scission point moment have a large deformation that described by the quadrupole deformation parameter ?2,but it does not consider the fragments charge distribution of the diffuseness(the charge density distribution is constant).On the basis of the above model,the expression of the average total kinetic energy distribution of the fragments is obtained by strict theoretical derivation.Comparing and analyzing the experimental value of the average total kinetic energy of the four pairs of fragments:symmetrical fission point,the maximum of fragments kinetic energy,the maximum of mass distribution and very asymmetric point,it can verify the rationality of the ap-proximate expression of the theoretical formula.Meanwhile,through further analysis experimental data of the average total kinetic energy distribution,the expression of the deformation parameters of the initial fragments have a relationship to the number of charge,mass number and isospin asymmetry,and the average total kinetic energy is similar to the experimental value in the overall shape.(2)Based on the(1),considering the diffuseness of the initial fragments further,it assumes that the two initial fragments are overlapped at the scission point,At the same time,the model think that the overlap should have nuclear-nuclear interaction effect.After considering the nuclear-nuclear interaction effect,the calculated results show that consider about the physical mech-anism more meticulously,but there is no obvious improvement to the results,which shows that the nuclear interaction has little effect on the fragment of average kinetic energy distribution,and also explain that other factors(such as shell effect)affects the average total kinetic energy distribution.