Authors & Affiliations
Piksaikin V.M., Egorov A.S., Gremyachkin D.E., Mitrofanov K.V.
A.I. Leypunsky Institute for Physics and Power Engineering, Obninsk, Russia
Piksaikin V.M. – Leading Researcher, Cand. Sci. (Phys.-Math.), A.I. Leypunsky Institute for Physics and Power Engineering.
Egorov A.S. – Researcher, A.I. Leypunsky Institute for Physics and Power Engineering.
Mitrofanov K.V. – Head of Laboratory, A.I. Leypunsky Institute for Physics and Power Engineering.
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.
delayed neutrons, relative abundance, half-lives, nuclear fission, thermal and fast neutrons
1. Spriggs G.D., Campbell J.M., Piksaikin V.M. An 8-Group Delayed Neutron Model Based on a Consistent Set of Half-Lives. Progress in Nuclear Energy, 2002, vol. 41, no. 1-4, pp. 223–251.
2. Spriggs G.D., Campbell J.M. Summary of measured delayed neutron parameters. Progress in Nuclear Energy, 2002, vol. 41, no. 1–4, pp. 145–201.
3. Piksaikin V.M., Kazakov L.E., Isaev S.G., Tarasko M.Z., Roshchenko V.A., Tertytchnyi R.G., Spriggs G.D., Campbell J.M. Energy dependence of relative abundances and periods of delayed neutrons from neutron-induced fission of 235U, 238U, 239Pu in 6- and 8-group model representation. Progress in Nuclear Energy, 2002, vol. 41, no. 1–4, pp. 203–222.