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(n, 2n) Reaction Cross Section Measurement with A Beam DT Neutron Source

The method has been established to measure (n,2n) reaction cross section with the coincidence detection technique using a newly developed pencil beam DT neutron source at FNS of JAERI. A cylindrical manganese, the (n,2n) cross section of which was measured precisely with the foil activation method, was used to check the experimental method. It was confirmed from the experimental results that the present new method was basically functioning to measure only two neutrons emitted through (n,2n) reaction. Considering the not so strong angular dependence for Mn, by adoption of the TOF measurement the cross sections especially for medium heavy elements can be accurately determined. Consequently, by the present method, it is expected that complete (n,2n) reaction cross section measurements for stable-isotope producing elements by (n,2n) reaction would become possible with the coincidence detection and TOF methods.