SCISSION NEUTRON EMISSION AND PROMPT FISSION NEUTRON SPECTRUM

ISSUES

Authors & Affiliations

Kornilov N. V., Kagalenko A.B.
State Scientific Centre - A.I. Leipunsky Institute for Physics and Power Engineering, Obninsk, Russia

Abstract

The mass, energy and angular integrated spectra of prompt fission neutrons for ²³⁵U induced fission in the energy range from thermal to 5 MeV were analyzed. It allows assume that about 0.362±0.025 neutrons per fission are emitted due to another mechanism then neutron emission from excited fragments after full acceleration. The spectrum of scission neutrons consists of two components with average energy 0.98 MeV and 2.74 MeV. The share of scission neutrons and their spectrum shape estimated in this work does not contradict to results of differential experiments analyzed in previous papers.

Keywords
spectra of prompt fission neutrons, U-235, neutron emission model, spectrum of scission neutrons, energy distribution

Article Text (PDF, Translated by IAEA)

References

1. Kornilov, N.V., Kagalenko, A.B., Hambsch, F.-J. Preprint FEI-2763, Obninsk, Procceedings of ISINN-7, Dubna, p.241, (1999), Nuclear Physics A686, p.187, 2001.

2. Kornilov, N.V., Kagalenko, A.B., Hambsch, F.-J. Physics of Atomic Nuclei, 64(8), 1372, 2001.

3. Budtz-Jorgensen, C, Knitter, H.-H. Nuclear Physics A490, 307, 1988.

4. Bowman, H.R., Milton, J.C.D. et al. Physical Review 126, 2120, 1962.

5. Riehs, P. Acta Phys. Austriaca 53, 271, 1981.

6. Piksaikin, V.M. et al. Journal of Nuclear Physics 25(4), 723, 1977.

7. Seregina, E.A., Djatchenko, P.P. Journal of Nuclear Physics, 42, 6(12), (1985),1337; 43, 5, (1986), 1092.

8. Seregina, EA. Measurements and Analysis of Angular-Energy Distribution for ²⁵²Cf(SF) neutrons, PhD Thesis, 1985, Obninsk.

9. Skarsvag, K, Bergheim, K. Nuclear Physics 45, 72, 1963.

10. Samant, M.S., Anand, R.P., et al. Physical Review 51(6), 3127, 1995.

11. Watt, BE. Physical Review 52, 1037, 1952.

12. Madland, D.G., Nix, J.R Nuclear Science and Engineering 81, 213, 1982.

13. Marten, H., Seeliger, D. Proceeding of the Advisory Group Meet. On Nuclear Standard Ref Data, Geel, Belgium, 1984, IAEA-TECHDOC-335, Vienna, 255, 1985.

14. Gerasimennko, B.F., Rubchenia, V. A. Atomic Energy 59, 335, 1985.

15. Le Couter, K.J., Lang, D.W. Nuclear Physics 13, 32, 1959.

16. Kornilov, N.V., Kagalenko, A.B., Hambsch, F.-J. Journal of Nuclear Physics, 62(2), 173, 1999.

17. Madland, D., LaBauve, R. J., Nix, J.R. In: Lemmel, H.D. (Ed), Proceedings of Consultant Meeting., Mito City, Japan, 1988; INDC(NDS)-220, Vienna, p.259, 1989.

18. Nuclear Standards for Nuclear Measurements. In: Conde, H. (Ed.), NEANDC-311U, INDC(SEC)-101, OECD, 1992.

19. Kimura, I., Nishio, K, Nakagome, Y. J. Nuclear Science and Technology 35, 631, 1998.

20. Milton, J.C.D., Frezer, J.S. Symposium on the Physics and Chemistry of Fission, IAEA, 2, 39, 1965.

21. Nishio, K, Nakagome, Y. et al. Nuclear Physics A632, 540, 1998.

22. Starostov, B.I. Neutron Physics (6-th All Union Conference for Neutron Physics, Kiev, USSR, 1983), 2, 285, 290, 294, (1984), EXFOR 40871, 40872, 40873.

23. Lajtai, A. et. al. IAEA-TECDOC-335, 312, 1985, EXFOR 30704.

24. Yufeng, W. et al. Chinese Journal for Nuclear Physics 11, 47, 1989, EXFOR 32587.

25. Abramson, D. Neutron Physics (2-nd All Union Conference for Neutron Physics, Kiev, USSR, 1973), 3, 47, (1974), EXFOR 20997.

26. Kornilov, N.V., Kagalenko, A.B., et al. Proceedings of ISINN-6, Dubna, p.242, 1998.

27. Johanson, P.I., Holmquist, B. Nuclear Science and Engineering, 62, 695, 1977.

28. Trufanov, A.M., Lovchikova, G.N. et. al. Physics of Atomic Nuclei 57, 572, 1994.

29. Staples, P., Egan, J.J. et al. Nuclear Physics A591, 41, 1995.

30. Boykov, GS. et al. Journal of Nuclear Physics, 53, 628, 1991, EXFOR 41110, 41094.

UDC 539.173.84

Problems of Atomic Science and Technology. Series: Nuclear Constants", issue 2, 2001

BROND-3.1

ISSUES

SCISSION NEUTRON EMISSION AND PROMPT FISSION NEUTRON SPECTRUM