Authors & Affiliations
Roshchenko V.A., Piksaikin V.M., Korolev G.G., Balakshev Yu.F.
Russian Federation State Scientific Centre — A.I. Leipunsky Institute of Physics and Power Engineering, Obninsk, Russia
Experimental results for the cumulative yields of delayed neutron precursors (87Br, 88Br, 89Br, 91Br, 93Kr, 94Rb, 95Rb, 137I, 138I, 139I and 140I) were obtained for the neutron-induced fission of 237Np and 238U. For the first time a detailed energy dependence of cumulative yields of delayed neutron precursors was obtained for a wide range (0.5–5 MeV) of fissioning system excitation energies. The results obtained were compared with analogous data available in the literature.
cumulative yields, delayed neutron precursors, fission of237Np, 238U, energy dependence, fissioning system excitation energies
Article Text (in English, PDF, Tranlated by IAEA)
1. Wahl A. C., et al. Nuclear Charge Distribution in Low Energy Fission // Phys. Rev., 1962, V.126, P. 1112-1127.
2. Gudkov A.N., Koldobski A.B. et al. Yields of Delayed Neutron Precursors in the Fission of Actinides // Radiochimica Acta, 1992, V.57, P. 69-75.
3. Piksaikin V.M. et al. 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, V.41, No. 1-4, P. 203 – 222.
4. Piksaikin, V.M., et al., Characteristics of the energy dependence of the total delayed neutron yields in fission of 235U and 237Np nuclei by fast neutrons, Yad. Fiz., 1999, v.62, No. 6, pp. 1–9 [in Russian].
5. Piksaikin V.M. et al. Experimental Studies of the Absolute Total Delayed Neutron Yields from Neutron Induced Fission of 238U in the Energy Range 1-5 MeV // Progress in Nuclear Energy, 2002, V.41, No. 1-4, P. 135-144.
6. Rudstam G., Aleklett K., Sihver L. Delayed-neutron branching ratios of precursors in the fission product region // Atomic Data and Nuclear Data Tables, 1993, V.53, No.1, P.1.
7.Fast Neutron Physics, edited by J. Marion and J. Fowler, v.1, Experimental Technique, Gosatomizdat, Moscow, 1963 [in Russian].
8. Cross Section Evaluation Working Group, ENDF/B-VI Summary Documentation, Report BNL-NCS-17541 (ENDF-201) (1991), edited by P.F. Rose, National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY, USA.
9. C. Nordborg, M. Salvatores Status of the JEF Evaluated Data Library, Nuclear Data for Science and Technology, edited by J. K. Dickens (American Nuclear Society, LaGrange, IL, 1994).
10. T. Nakagawa, et al. Japanese Evaluated Nuclear Data Library, Version 3, Revision 2 // J. Nucl. Sci. Technol. 1995, V.32, P. 1259.
11. Keepin G. R., Wimett T. F., and Zeigler R. K. Delayed Neutrons from Fissionable Isotopes of Uranium, Plutonium and Thorium // Physical Review, 1957, V. 107, No. 4, P. 1044.
12. Besant C.B. et al. // J.Br.Nucl.Energy Soc., 1977, V.16, P. 161.
13. Brady M.C. and England T.R. Delayed Neutron Data and Group Parameters for 43 Fissioning Systems // Nucl. Sci. Eng., 1989, V.103, P. 129-149.
14. Blachot J., Chung C., and Storrer F. JEF-2 Delaeyd Neutron Yields for 39 Fissioning Systems, // Ann.Nucl.Energy, 1997, V.24, No.6, P. 489-504.
15. D’Angelo A., Rowlands J.L. Conclusions Concerning the Delayed Neutron Data for the Major Actinides // Progress in Nuclear Energy, 2002, V.41, No.1-4, P. 391-412.
Problems of Atomic Science and Technology. Series: Nuclear Constants", issue 1-2, 2006