Nuclear Data for Science and Technology pp 471-473 | Cite as
A New Method for Measurement of (n,2n) Cross Section
Abstract
A new method, where the intervals of detected times of neutrons are measured, has been developed for measuring the fast neutron induced (n,2n) cross section. By the method, (n,2n) events are easily distinguished on a measured time interval spectrum since two neutrons from one (n,2n) reaction produce one unique time interval. This method can be applicable to every nuclide. Demonstration experiments on various conditions were performed by developing a He-3 counter banked detector system (HCBD) with the characteristics of high efficiency and appropriate neutron capture-time. The time interval spectra expected by this method were observed in the experiments. The efficiency and the neutron capture-time of the HCBD were measured using a Cf-252 source and agreed very well with those calculated using Multi-KENO. A fluence monitor suitable for the HCBD was also developed.
Keywords
(n,2n) cross section measurement technique interval of detected time He-3 counterPreview
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