(n,2n) reaction cross section measurement with a beam DT neutron source. Measurement method

The method has been established to measure (n,2n) reaction cross section with the coincidence detection technique using a newly developed beam-type DT neutron source at FNS, 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 neutron emitted through (n,2n) reaction. Also, for manganese not so strong angular dependence was observed though the statistical accuracy was not sufficient. Consequently, it is expected that complete measurement for stable-isotope producing element by (n,2n) reaction would become possible by several measurements. (author)