90°伴随粒子法D-D中子产额测量修正因子计算

开展了90°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 keV范围,90°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％.

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

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％.