SANS Polarization Analysis with Nuclear-Spin-Polarized 3He
SANS Polarization Analysis with Nuclear-Spin-Polarized 3He
复制标题
使用核自旋极化 3He 进行 SANS 极化分析
DOI：
10.1107/s0021889800099817
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发表时间：
2000
影响因子：
6.1
通讯作者：
J. Lynn
中科院分区：
文献类型：
--
作者：
T. Gentile;G. Jones;A. Thompson;J. Barker;C. Glinka;B. Hammouda;J. Lynn
将基于核自旋极化~ 3 He气体透射的中子自旋滤波器应用于中子小角散射（SANS）的极化分析。这样的自旋过滤器，这是基于大自旋依赖的中子吸收的3 He，使SANS偏振分析可能，因为它们的大角度接受。在本实验中，一个3 He为基础的分析仪被用来分离核散射成其相干和自旋非相干分量。极化3 He分析仪由两种不同的光泵浦方法制备，并安装在NIST中子研究中心（NCNR）的NG 3 SANS仪器上。在玻璃纸胶带和硅胶上进行测量，其散射几乎完全不相干和相干，分别在组合样品上进行测量。对于组合样品，使用偏振分析成功地证明了相干部分与非相干部分的分离。
A neutron spin filter based on transmission through nuclear-spin-polarized 3He gas has been applied to polarization analysis of small angle neutron scattering (SANS). Such spin filters, which are based on the large spin dependence of the absorption of neutrons by 3He, make SANS polarization analysis possible because of their large angular acceptance. In the present experiment, a 3He-based analyzer was employed to separate nuclear scattering into its coherent and spin-incoherent components. Polarized 3He analyzers were prepared by two different optical pumping methods and installed on the NG3 SANS instrument at the NIST Center for Neutron Research (NCNR). Measurements were taken on cellophane tape and silica gel, for which the scattering is almost completely incoherent and coherent, respectively, and on a combined sample. For the combined sample, separation of the coherent part from the incoherent part was successfully demonstrated using polarization analysis.