This work is aim at studying the dependence of fission yields on incident neutron energy, so as to produce evaluated yield sets of the energy dependence. Experimental data at different neutron energies for gas fission...This work is aim at studying the dependence of fission yields on incident neutron energy, so as to produce evaluated yield sets of the energy dependence. Experimental data at different neutron energies for gas fission products 85m,87,88Kr and 138Xe resulting from the 238U(n, f) reaction are processed using codes AVERAGE for weighed average and ZOTT for simultaneous evaluation. Energy dependence of the cumulative fission product yields on the incident neutron is presented. The evaluated curve of product yield is compared with the results calculated by the TALYS-0.64 code. The present evaluation is consistent with other main libraries in error permission. The fit curve of 87,88Kr can be recommended to predict the unmeasured fission yields. Comparisons of the evaluated energy dependence curves with theoretical calculated results show that the predictions using purely theoretical model for the fission process are not sufficiently accurate and reliable for the calculations of the cumulative fission yields for the 238U(n,f).展开更多
a single crystal chemical vapor deposition （scCVD） diamond detector has been successfully employed for neutron measurements in the EAST （Experimental Advanced Superconducting Tokamak） plasmas. The seCVD diamond de...a single crystal chemical vapor deposition （scCVD） diamond detector has been successfully employed for neutron measurements in the EAST （Experimental Advanced Superconducting Tokamak） plasmas. The seCVD diamond detector coated with a 5 μm 6LiF （95% 6Li enriched） layer was placed inside a polyethylene moderator to enhance the detection efficiency. The time-dependent neutron emission from deuteron plasmas during neutral beam injection （NBI） heating was obtained. The measured results are compared with that of fission chamber detectors, which always act as standard neutron flux monitors. The scCVD diamond detector exhibits good reliability, stability and the capability to withstand harsh radiation environments despite its low detection efficiency due to the small active volume.展开更多
基金Supported by the Research Fund for the Doctoral Program of Higher Education of China (No.200610001023)the Major State Basic Research Development Program of China (Nos. 2007CB209903 and 2008CB717803)the National Fund for Fostering Talents of Basic Science of China (No.J0630311)
文摘This work is aim at studying the dependence of fission yields on incident neutron energy, so as to produce evaluated yield sets of the energy dependence. Experimental data at different neutron energies for gas fission products 85m,87,88Kr and 138Xe resulting from the 238U(n, f) reaction are processed using codes AVERAGE for weighed average and ZOTT for simultaneous evaluation. Energy dependence of the cumulative fission product yields on the incident neutron is presented. The evaluated curve of product yield is compared with the results calculated by the TALYS-0.64 code. The present evaluation is consistent with other main libraries in error permission. The fit curve of 87,88Kr can be recommended to predict the unmeasured fission yields. Comparisons of the evaluated energy dependence curves with theoretical calculated results show that the predictions using purely theoretical model for the fission process are not sufficiently accurate and reliable for the calculations of the cumulative fission yields for the 238U(n,f).
基金supported by the National Magnetic Confinement Fusion Science Program of China(Nos.2013GB106004 and 2012GB101003)National Natural Science Foundation of China(No.91226102)
文摘a single crystal chemical vapor deposition （scCVD） diamond detector has been successfully employed for neutron measurements in the EAST （Experimental Advanced Superconducting Tokamak） plasmas. The seCVD diamond detector coated with a 5 μm 6LiF （95% 6Li enriched） layer was placed inside a polyethylene moderator to enhance the detection efficiency. The time-dependent neutron emission from deuteron plasmas during neutral beam injection （NBI） heating was obtained. The measured results are compared with that of fission chamber detectors, which always act as standard neutron flux monitors. The scCVD diamond detector exhibits good reliability, stability and the capability to withstand harsh radiation environments despite its low detection efficiency due to the small active volume.
