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本文描述了为测量固体中的电子动量分布及费米面而设计的装置,这一装置也可用于正电子素化学及其它正电子方面的研究。采用垂直长缝结构。样品至主缝中心的距离为3米,系统典型的几何角分辨率为0.33mrad。正电子源用~(22)Na,强度约30mCi。对能量0.511MeV的湮灭光子用NaI(T1)闪烁探头,其长度为300mm。核测量采用快-慢符合方案。实验操作采用简易自动控制方式。
This article describes a device designed to measure the electron momentum distribution and the Fermi surface in solids. This device can also be used for positron chemistry and other positron research. Vertical slit structure. The distance between the sample and the center of the main seam is 3 meters, and the typical geometrical angular resolution of the system is 0.33 mrad. Positron source with ~ (22) Na, the intensity of about 30mCi. Annihilation photons with an energy of 0.511 MeV were scanned with a NaI (T1) scintillation probe 300 mm in length. Nuclear measurement using fast - slow in line with the program. Experimental operation using simple automatic control method.