This paper presents the development and validation of China’s first benchmark measurement system for neutron leakage time-of-flight(TOF)spectra using a ^(252)Cf spontaneous fission source and spherical polyethylene s...This paper presents the development and validation of China’s first benchmark measurement system for neutron leakage time-of-flight(TOF)spectra using a ^(252)Cf spontaneous fission source and spherical polyethylene sample.EJ-309 and CLYC scintillation detectors were used for neutron detection,and a shadow cone was employed for background suppression.Notably,the SiC detector was,for the first time on this platform,applied as the start-time signal generator in TOF spectrum measurement.The TOF spectrum covering the energy range of 0.15−8.00 MeV was measured,and the results were systematically compared with evaluated data from four major nuclear libraries:ENDF/B-Ⅷ.1,JEFF-3.3,JENDL-5,and CENDL-3.2.The comparison revealed strong agreement across the full spectrum,with calculated to experimental(C/E)deviations remaining within 5%in the high-energy region and within 13%at low energies.These results verify the system’s stability and suitability for integral experiments.The established benchmark platform provides a strong technical foundation for future neutron nuclear data validation,particularly in shielding applications and the improvement of fission-spectrum nuclear databases.展开更多
基金Supported by the Continuous-Support Basic Scientific Research Project (BJ010261223282)。
文摘This paper presents the development and validation of China’s first benchmark measurement system for neutron leakage time-of-flight(TOF)spectra using a ^(252)Cf spontaneous fission source and spherical polyethylene sample.EJ-309 and CLYC scintillation detectors were used for neutron detection,and a shadow cone was employed for background suppression.Notably,the SiC detector was,for the first time on this platform,applied as the start-time signal generator in TOF spectrum measurement.The TOF spectrum covering the energy range of 0.15−8.00 MeV was measured,and the results were systematically compared with evaluated data from four major nuclear libraries:ENDF/B-Ⅷ.1,JEFF-3.3,JENDL-5,and CENDL-3.2.The comparison revealed strong agreement across the full spectrum,with calculated to experimental(C/E)deviations remaining within 5%in the high-energy region and within 13%at low energies.These results verify the system’s stability and suitability for integral experiments.The established benchmark platform provides a strong technical foundation for future neutron nuclear data validation,particularly in shielding applications and the improvement of fission-spectrum nuclear databases.
