Measurement of Neutron Induced Fission Cross Section Ratios for 235U, 238U and 232Th from 1 to 100 MeV
The method of the “shape” measurement was realized using an impulse spallation source of the synchrocyclotron at Leningrad Nuclear Physics Institute. The fission cross section ratios 238U/235U and 232Th/235U were measured as a function of neutron energy from 1 to 100 MeV. A multiplate methane gas ionization chamber located at a 50 m flight path was used to scan by time the fission count rates for all the three samples simultaneously. The data were compared with those obtained using linear accelerator.
Keywordsfission cross section fast neutrons uranium thorium
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