二氧化硅气凝胶中μ介子发射的测量
Measurement of muonium emission from silica aerogel
摘要：
观察到μ 鎓（$μ^{+}e^{-}$）原子从二氧化硅气凝胶发射到真空中。从密度在29 mg cm $^{-3}$至178 mg cm $^{-3}$范围内的二氧化硅气凝胶样品建立了μ素发射的特性。与距离的气凝胶表面，这是敏感的速度分布的μ衰变时间的光谱，遵循一般功能预期从扩散过程中，而一个简单的室温热扩散模型的小偏差被确定。扩散过程的参数推导出所观察到的产量。
英文摘要：
Emission of muonium ($μ^{+}e^{-}$) atoms from silica aerogel into vacuum was observed. Characteristics of muonium emission were established from silica aerogel samples with densities in the range from 29 mg cm$^{-3}$ to 178 mg cm$^{-3}$. Spectra of muonium decay times correlated with distances from the aerogel surfaces, which are sensitive to the speed distributions, follow general features expected from a diffusion process, while small deviations from a simple room-temperature thermal diffusion model are identified. The parameters of the diffusion process are deduced from the observed yields.
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