90o伴随粒子法D-D中子产额测量修正因子计算

Calculation on the associated particle method for 90° to measure the neutron yield correction factors of D-D neutron generator

开展了90o伴随粒子法D-D中子产额测量中的修正因子理论计算方法研究,基于MATLAB软件平台,开发了用于修正因子计算的计算机程序。计算给出了厚靶条件下,入射氘能量在20–700 ke V范围,90o伴随粒子法D-D中子产额测量各向异性修正因子Rthick、中子和质子产额比(Yd,n/Yd,p)thick及总修正因子RY,并与早先的研究结果进行了对比,分析了计算结果的不确定度,总修正因子计算数据的不确定度约为2%。

Background： In recent years, the neutron generator based on D-D reaction is widely investigated due to some potential applications and the advantage of the more security without the use of radioactive tritium target and long target lifetime with D ion self-injection effect in target. The accurate measurement of fast neutron yield of the D-D neutron generator is a key problem to be solved. For D-D neutron generator, the associated particle method is possibly one of the most accurate ways for the neutron source strength calibration. Purpose： In order to measure the neutron yield of D-D neutron generator using the associated particle method, the anisotropy correction factor and the yield ratio of neutron and proton need to be calculated. Methods： A method for calculating the anisotropy correction factor and the yield ratio and a computer program based on MATLAB software platform were developed. Results： In this work, the anisotropy correction factors, the yield ratio of neutron and proton and the total correction factors were presented for the thick-target and for 90° associated particle measurement in the deuterons energy region of 20-700 keV. Conclusion： The uncertainty of the total correction factors （Ry） comes mainly from the cross section data. The uncertainty of RY is estimated to be about 2%.