2019•PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY SERIES NUCLEAR AND REACTOR CONSTANTSRequires access
TIME DEPENDENCE OF DELAYED NEUTRONS AND 6-, 8-GROUP REPRESENTATION FOR THE THERMAL AND FAST FISSION OF 235U, 238U AND 239Pu
V.M. Piksaikin, A.S. Egorov, D.E. Gremyachkin, K.V. Mitrofanov
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Abstract
In the present work the digital data on decay curves of delayed neutron intensity, measured for the fission of 235U, 238U and 239Pu by thermal and fast neutrons, is presented. The estimation of time parameters of delayed neutrons in 6 and 8 groups representation have been made on the base of individual experimental series using iterative least squares technique. It have been shown, that uncertainties of the parameters estimation in the 8 group representation, obtained on the basis of the experimental data are comparable with the uncertainties of the 6-group representation. The experimental data measured in the wide range of the time after the end of irradiation - (0,1-700 s) are of significant interest for intercomparison and validation of the different mathematical methods and programs, used for the processing of the decay curves of delayed neutron intensity, and also for analysis of the experimental data in the process of formulating of the evaluated data on relative abundances and half-lives of the delayed neutron precursors for the wide range of the fissioning nuclides.