基于能量-速度关联技术的裂变产物质量分布测量方法研究

采用能量E-速度v关联技术测量裂变产物碎片的动能和飞行速度能精确测定裂变产物核的质量。本工作主要研究能量-速度关联技术的可行性并解决相关关键技术。实验测量系统由飞行时间测量单元、能量探测器和真空靶室系统组成。实验中用1对微通道板探测器测量粒子飞行时间来确定粒子速度,金硅面垒探测器测量粒子能量。对于~(241) Am放射源5.48 MeVα粒子,飞行时间测量系统时间分辨(FWHM)为186ps,金硅面垒探测器能量分辨(FWHM)为44keV。实验完成了~(252) Cf自发裂变源产物质量分布试测量。初步实验结果显示,裂变产物质量分布在110amu(amu为原子质量单位)的位置时,其质量分辨为1.6amu。

E-v Method for Fission Products Mass Distribution Measurement

The E-v method of measuring the kinetic energy (E) and velocity (v) of outgoing fission fragments was utilized with the goal of fission products mass distribution measurements.This work focuses on testing the feasibility and solving some key technologies of E-v method for mass distribution measurement.The experiment system consists of detector components for time-of-flight,energy measurements and flight path vacuum tube.A pair of micro-channel plates for particle time-of-flight measurement were used to determine the particle velocity.A golden silicon surface barrier detector is for energy.The time-of-flight system time resolution (FWHM) is 186 ps and the energy resolution (FWHM) is 44 keV for 5.48 MeV α particle of 241 Am.Fission products mass distribution of 252Cf spontaneous fission was measured.A preliminary result of 252Cf spontaneous fission mass distribution resolution is 1.6 amu (atom mass unit) at the mass of about 110 amu.