The energy dependence of the temporal parameters of delayed neutrons from the neutron-induced fission of 235U in the energy range from 0.4 to 8 MeV

In the present paper the results are discussed on the relative abundances of DN and the half-lives of their precursors from the neutron induced fission of U-235 in the energy range 0.4-8 MeV which have been measured on a modified experimental set-up of the Institute for Physics and Power Engineering (IPPE). The obtained data are compared with the appropriate experimental data by other authors and the data obtained by the summation method and the data presented in the evaluated data libraries JEFF, JENDL, and ENDF/B. The comparison was made in the terms of the average half-life of delayed neutron precursors < T-1/2(E-n)>. The obtained data < T-1/2(En) > were used also for the estimation of the energy dependence of the total DN yield nu d(En) from the neutroninduced fission of 235U on the basis of the correlation properties of delayed neutrons. The obtained total DN yield is compared with available in the open literature data of different origin. The observed features of the obtained nu d(En) data most likely indicates that the energy dependence nu d(En) is largely governed by the chance structure of the U-235 fission cross-section and to a lesser extent by the odd-even and other effects. The data on the relative abundances and the half-lives of delayed neutron precursors as well as the total delayed neutron yield for U-235 are important for both the safe operation of power reactors and validation of the energy dependence of fission product yields.