Calculation of the energy dependence of fission fragments yields and kinetic energy distributions for neutron-induced ²³⁵U fission

【摘要】 Fission fragments yields and average total kinetic energy are fundamental nuclear data for nuclear energy applications and the study of nuclear devices.Certain fission products,such as ⁹⁵Zr,⁹⁹Mo,¹⁴⁰Ba,¹⁴⁴Ce,and¹⁴⁷Nd,serve as burnup monitors,assessing the number of fissions induced by neutrons on ²³⁵U.However,current experimental data for these fission products worldwide are inconsistent,introducing significant uncertainty into related scientific research.In this study,we employed the Potential-driving Model to calculate the independent yields of²³⁵U and evaluate its advantages in such calculations.Additionally,we investigated the energy dependence of independent yields to select important products.Furthermore,we calculated the cumulative yields of ⁹⁵Zr,⁹⁹Mo,¹⁴⁰Ba,¹⁴⁴Ce,and ¹⁴⁷Nd,and compared them with existing literature data to explore the energy dependence of fission products for ²³⁵U.Given the lack of fission product yield data above 14.8 MeV,we extended our calculated incident neutron energy to 20 MeV,aiming to support future scientific research.The Geant4 physical model does not consider the influence of incident neutron energy on the average total kinetic energy of fission fragments;thus,we introduced the excitation function of the total kinetic energy of fission fragments recommended by Madland et al.,which effectively describes the experimental data of the average total kinetic energy of fragments formed in ²³⁵U fission.In this paper,we comprehensively discuss the energy dependence of fission product yields and average total kinetic energy.更多还原

【Abstract】 Fission fragments yields and average total kinetic energy are fundamental nuclear data for nuclear energy applications and the study of nuclear devices.Certain fission products,such as ⁹⁵Zr,⁹⁹Mo,¹⁴⁰Ba,¹⁴⁴Ce,and¹⁴⁷Nd,serve as burnup monitors,assessing the number of fissions induced by neutrons on ²³⁵U.However,current experimental data for these fission products worldwide are inconsistent,introducing significant uncertainty into related scientific research.In this study,we employed the Potential-driving Model to calculate the independent yields of²³⁵U and evaluate its advantages in such calculations.Additionally,we investigated the energy dependence of independent yields to select important products.Furthermore,we calculated the cumulative yields of ⁹⁵Zr,⁹⁹Mo,¹⁴⁰Ba,¹⁴⁴Ce,and ¹⁴⁷Nd,and compared them with existing literature data to explore the energy dependence of fission products for ²³⁵U.Given the lack of fission product yield data above 14.8 MeV,we extended our calculated incident neutron energy to 20 MeV,aiming to support future scientific research.The Geant4 physical model does not consider the influence of incident neutron energy on the average total kinetic energy of fission fragments;thus,we introduced the excitation function of the total kinetic energy of fission fragments recommended by Madland et al.,which effectively describes the experimental data of the average total kinetic energy of fragments formed in ²³⁵U fission.In this paper,we comprehensively discuss the energy dependence of fission product yields and average total kinetic energy.更多还原