【摘要】 测量电子反中微子静止质量的最灵敏的方法是测量氚的β谱。采用大面积源能在保持β谱仪高分辨率的情况下,显著提高谱仪的亮度。利用传输矩阵方法和轨迹跟踪方法,分别在二级近似和高级近似下研究了大面积源的静电补偿和几何修正。计算了面源和面源上等位线的理想形状,讨论了它们的圆柱面近似和圆弧近似。以中国原子能科学研究院中微子质量测量β谱仪的磁场参数的依据。给出了一个宽9.6cm高10.0cm的大面积源算例,采用大面积源能使谱仪的亮度提高两个量级以上,而分辨却只加大一倍多点。理论计算结果与实验结果符合 的很好。更多还原

【Abstract】 Measuring the end-point-region of the tritium p-spectrum is the most sensitive method to search the rest mass of electron anti-neutrino. The application’!of a widely extended p source can notably improve the luminosity of the p spectrometer under conditions of high-resolution. The electrostatic compensation and geometric corrections of the widely extended source are investigated in second -order and high-order approximations with transfer matrix and ray-tracing methods respectively. The ideal configurations of the widely extended source and the equipotential lines on the source surface are calculated, and their cylindrical surface approximation and circular arc approximation are also discussed. An example of the widely extended source of 9.6 cm in width and 10.0cm in height is given on the basis of the magnetic field parameters of the P spectrometer used to search the rest, mass of neutrino at Institute of Atomic Energy, Beijing. By applying the widely extended source,the luminocity of the P spectroer can increase by a factor of more than two orders of magnitude, while the resolution increases by a factor of only abou,t two. The results of theoretical calculation and experiments are in good agreement with each other.更多还原