【摘要】 通过将探测器的数目由1个增加到4个、用水平发散角为20′的Soller准直器取代30′的单缝准直器,对中国原子能科学研究院重水研究堆旁的二轴中子粉末衍射谱仪进行了改进。铁粉的衍射实验结果表明:改进后的谱仪在同等中子计数强度条件下,计数速率提高了2.3倍,因而缩短了测量时间,同时也提高了谱仪的分辨率。更多还原

【Abstract】 The detector system of the two-axis neutron powder diffractometer at the Heavy Water Research Reactor of China Institute of Atomic Energy was improved by increasing the number of detectors from one to four and by installing the third Soller collimators with horizontal divergence of 20′. The measurements of Fe powder diffraction patterns show that the counting rate of the diffractometer is increased by a factor of 2.3 and the resolution is also improved at the lower and mediate scattering angle region.更多还原