Speaker
Description
The neutron total cross section data of 9Be plays an important role in nuclear structure model of light nuclei and nuclear power installations. A measurement of the neutron total cross section of 9Be in the 1eV-30MeV energy region has been carried out using time-of-flight method and transmission method by the neutron total cross-sectional spectrometer (NTOX) based on the multi-layer fast fission chamber at the China Spallation Neutron Source (CSNS)- Back-n white neutron source (Back-n). The fission count-energy distribution of 235U and 238U with no sample and with Be samples in three thicknesses was measured in the double-bunch operation modes during beam power of 100 kW. The bayes method is used to eliminate the influence of the double-bunch problem on neutron measurement in the high energy region. The unfolding results of neutron total cross section conform to ENDF/B-VIII.0 evaluation library data within the range of experimental uncertainty for most energy points in the 10keV-30MeV energy region. The neutron total cross section of 9Be measured by this experiment is also consistent with ENDF/B-VIII.0 evaluation library data in 1eV-10keV energy region. The results of this experiment can provide technical support for further data analysis and related nuclear data evaluation.