用极化$^{3}He$原子束探测短程自旋相关相互作用
Probing the Short Range Spin Dependent Interactions by Polarized $^{3}He$ Atom Beams
摘要：
提出了利用极化$^{3}He$原子束研究短程自旋相关力的实验方案。高强度、高偏振度、小束径的$^{3}He$原子束已成功地产生并应用于表面科学研究。通过采用$μ$ -金属和超导体的组合屏蔽和双束路的背景降低设计，单位长度的自旋旋转角的精度可以提高$\sim10^{4}$倍。通过这种精度，结合使用高密度和低磁化率的样品源质量，并在必要时反转一个光束路径，在三种不同类型的自旋相关相互作用的灵敏度可能会提高多达$\sim10^{2}$到$\sim10^{8}$在毫米范围内的当前实验。
英文摘要：
Experiments using polarized $^{3}He$ atom beams to search for short range spin dependent forces are proposed. High intensity, high polarization, small beam size $^{3}He$ atom beams have been successfully produced and used in surface science researches. By incorporating background reduction designs as combination shielding by $μ$-metal and superconductor and double beam pathes, the precision of spin rotation angle per unit length could be improved by a factor of $\sim10^{4}$. By this precision, in combination with using a high density and low magnetic susceptibility sample source mass,and reversing one beam path if necessary, sensitivities on three different types of spin dependent interactions could be possibly improved by as much as $\sim10^{2}$ to $\sim10^{8}$ over the current experiments at the millimeter range.
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