论文标题
具有分析推导的三轴数据的中子极化校正
Neutron polarisation correction to triple-axis data with analytical derivations
论文作者
论文摘要
偏振中子散射是研究凝结物质磁性的首选方法。偏振中子通常的通量非常低，复杂的实验构型进一步降低了计数速率。因此，需要中子极化校正。在这里，我们通过分析得出校正的部分微分散射横截面的公式。分析方法是为纵向极化分析而设计的，并且校正通常适用于具有三轴光谱仪的时间独立的极化中子。然后，我们将校正应用于$ $ _3 $ _3 $ fe $ _5 $ o $ $ _ {12} $的最新结果。尽管实验确定中子自旋极化者和拖鞋的效率低下参数存在困难，但该校正似乎可以正常工作。
Polarised neutron scattering is the method of choice to study magnetism in condensed matter. Polarised neutrons are typically very low in flux, and complex experimental configurations further reduce the count rate. Neutron polarisation corrections would therefore be needed. Here we analytically derive formulae of the corrected partial differential scattering cross-sections. The analytical method is designed for the longitudinal polarisation analysis, and the correction generally holds for time-independent polarised neutrons with a triple-axis spectrometer. We then apply the correction to recent results of our $P_x$ experiment on Y$_3$Fe$_5$O$_{12}$. Although there is a difficulty with the experimental determination of inefficiency parameters of neutron spin polarisers and flippers, the correction appears to work properly.
