Relative yield of delayed neutrons and half-life of their precursor nuclei with fissioning of 239Pu by 14.2–17.9 MeV neutrons |
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Authors: | V A Roshchenko V M Piksaikin L E Kazakov G G Korolev |
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Affiliation: | (1) State Science Center of the Russian Federation — A. I. Leipunskii Physics and Power-Engineering Institute, Russia |
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Abstract: | The energy dependence of the relative yield of delayed neutrons and of half-lives of their precursor nuclei with fissioning
239Pu by 14.2–17.9 MeV neutrons is measured. The data obtained are analyzed in terms of the average half-life 〈T〉 of the precursor
nuclei of the delayed neutrons. It is shown that the observed growth of 〈T〉 with increasing primary neutron energy in the
energy range studied is due predominately to opening of the channels for the emission fission of nuclei. Comparing the data
on the average half-life of the precursor nuclei of delayed neutrons obtained in the present work with those obtained by other
authors showed that the anomalously high values of 〈T〉 are due to methodological features of the experiment which are related
with the properties of the reaction T(d, n)4He used as a neutron source on electrostatic charged-particle accelerators. The data obtained are of great value for developing
instrumentational nondestructive means for determining the nuclide composition of nuclear fuel based on the detection of delayed
neutrons.
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Translated from Atomnaya énergiya, Vol. 101, No. 6, pp. 441–444, December, 2006. |
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