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Abstract
Analysis of existing database on the relative abundances of delayed neutrons and half-lives of their precursors measured for neutron induced fission of heavy nuclei in the energy range above 14 MeV shows that such data are not available for many nuclides, which are important for nuclear fuel cycle. In the present work for the first time the time dependence of delayed neutron activity for the neutron-induced fission of 237 Np in the energy range above 14 MeV was obtained using T(d,n)4 He.
Highlights
In recent years efforts for improving the delayed neutron database were directed mainly to analysis of delayed neutron characteristics for neutron induced fission of 235U, 238U, 239Pu using thermal and fast neutrons [1]
The time dependence of the neutron activity from neutron induced fission of 237Np in the energy range from 14.2 to 18 MeV was obtained in the present work considering both the blocking effect and the effect of concomitant sources shown on Fig. 3
Measurements of the temporal dependence of neutron activity for the case of neutron induced fission of 237Np in energy range from 14.2 to 18 MeV have been made for the first time
Summary
In recent years efforts for improving the delayed neutron database were directed mainly to analysis of delayed neutron characteristics for neutron induced fission of 235U, 238U, 239Pu using thermal and fast neutrons [1]. Nuclides and energy range used in this work were determined first of all by the needs of power engineering. At the same time energy ranges of primary neutrons exist for which the physical characteristics of delayed neutrons are poorly known. First of all, this is an issue for that energy range above 14 MeV. This is an issue for that energy range above 14 MeV This energy range is interesting for practical applications related to the development of non-destructive methods used for the analysis of fissile materials which are based on delayed neutron measurement
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