Based on the time-dependent coincidence method, a preliminary experiment has been performed on uranium metal castings with similar quality （about 8-10 kg） and shape （hemispherical shell） in different enrichments u...Based on the time-dependent coincidence method, a preliminary experiment has been performed on uranium metal castings with similar quality （about 8-10 kg） and shape （hemispherical shell） in different enrichments using neutron from Cf fast fission chamber and timing DT accelerator. Groups of related parameters can be obtained by analyzing the features of time-dependent coincidence counts between source-detector and two detectors to charac- terize the fission signal. These parameters have high sensitivity to the enrichment, the sensitivity coefficient （defined as （AR/Am）/f-t） can reach 19.3% per kg of 235U. We can distinguish uranium castings with different enrichments to hold nuclear weapon verification.展开更多
In his paper,we obtain a general theorem concerning the existence of solutions to an m-point boundary value problem for the second-order differential equation with impulses.Moreover,the result can also be applied to s...In his paper,we obtain a general theorem concerning the existence of solutions to an m-point boundary value problem for the second-order differential equation with impulses.Moreover,the result can also be applied to study the usual m-point boundary value problem at resonance without impulses.展开更多
文摘Based on the time-dependent coincidence method, a preliminary experiment has been performed on uranium metal castings with similar quality （about 8-10 kg） and shape （hemispherical shell） in different enrichments using neutron from Cf fast fission chamber and timing DT accelerator. Groups of related parameters can be obtained by analyzing the features of time-dependent coincidence counts between source-detector and two detectors to charac- terize the fission signal. These parameters have high sensitivity to the enrichment, the sensitivity coefficient （defined as （AR/Am）/f-t） can reach 19.3% per kg of 235U. We can distinguish uranium castings with different enrichments to hold nuclear weapon verification.
基金Sponsored by the National Natural Science Foundation of China (No.10971238)
文摘In his paper,we obtain a general theorem concerning the existence of solutions to an m-point boundary value problem for the second-order differential equation with impulses.Moreover,the result can also be applied to study the usual m-point boundary value problem at resonance without impulses.
