Measurement of MA Fission Cross section at YAYOI

摘要

Fission cross section ratios of minor actinide nuclides (Am-241, Am-243) relative to U-35 in the fast neutron energy region ahve been measured using a back-to-back (BTB) fission chamber at YAYOI fast neutron source reactor. A small BTB fission chamber was developed to measure the fission cross section ratios in the center of the core at YAYOI reactor. Dependence of the fission cross section ratios on neutron spectra was investigated by changing the position of the detector in the reactor core.