中微子探测器液氦和氖VUV发射谱、自吸收和散射的计算
Calculations of liquid helium and neon VUV emission spectra, self-absorption and scattering for a neutrino detector
摘要：
为了评估最近提出的探测太阳和超新星释放的低能中微子的方案的可行性，称为清洁，低温低能天体物理学与稀有气体，它依赖于稀有气体低温液体的透明度，由中微子产生的真空紫外辐射，我们分析了真空紫外发射，自吸收，和散射的液体氦和氖，清洁的主要候选人。由于在相关激发态的平衡距离处处于基态的惰性气体原子的强排斥，发射光谱实质上从吸收光谱偏移，并且原则上吸收预期非常小，从而允许构建大型检测器。然而，我们的分析表明，自吸收和瑞利散射的大小相比，建议的检测器。我们的理论发射光谱发现与实验观察一致，虽然存在一些偏差，由于二元相互作用近似，我们的从头计算瑞利散射长度被发现与其他计算的基础上外推的实验折射率。吸收过程可能导致再发射，这会保留光子的数量，但延迟它们从液体中逃逸，或者导致非辐射猝灭。
英文摘要：
To evaluate the feasibility of the recently proposed detection scheme of low energy neutrinos released from the Sun and supernovae called CLEAN, Cryogenic Low Energy Astrophysics with Noble Gases, which relies on the transparency of noble-gas cryogenic liquids to VUV radiation produced by neutrinos, we analyze theoretically VUV emission, self-absorption, and scattering of liquid helium and neon, primary candidates for CLEAN. Owing to strong repulsion of noble-gas atoms in the ground states at the equilibrium distance of the relevant excited state, the emission spectrum is substantially shifted from the absorption spectrum, and in principle the absorption is expected very small, allowing building large detectors. Our analysis, however, shows that the self-absorption and Rayleigh scattering are comparable to the size of the proposed detector. Our theoretical emission spectra are found in agreement with experimental observations although some deviation exists due to binary-interaction approximation, and our ab initio Rayleigh scattering lengths are found in agreement with other calculations based on the extrapolation of experimental refraction indices. The absorption process can result in either re-emission, which conserves the number of photons but delays their escape from the liquid, or in non-radiative quenching.
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