氢、氘和氚在氦同位素上的低能弹性散射
Low energy elastic scattering of hydrogen, deuterium and tritium on helium isotopes
AI总结：
研究氢、氘和氚在氦同位素上的低能弹性散射，探讨同位素间共振态对散射截面的影响，揭示低能和高能区域截面行为差异。
摘要：
受原子氚源用于中微子质量实验和氘和氚的多普勒自由双光子1S-2S光谱学需求的驱动，我们计算了氢同位素（H、D和T）在氦同位素（³He和⁴He）上的能量依赖弹性散射截面，在温度范围1~mK到300~K内。发现氚-氦散射截面在低能区由于接近阈值的共振s波束缚态而显著增强，类似于三重态T-T系统中预测的共振态。尽管低能区由于s波增强导致截面范围广泛，但高能区散射趋于共同值，此时散射本质上趋于几何性质。
英文摘要：
Motivated by the needs of atomic tritium sources for neutrino mass experiments and Doppler-free two-photon 1S-2S spectroscopy in atomic deuterium and tritium, we present calculations of energy-dependent elastic scattering cross sections of hydrogen isotopes (H, D and T) on helium isotopes ($^3$He and $^4$He) in the temperature range 1~mK to 300~K. The tritium-on-helium cross sections are found to be enhanced over their hydrogen-on-helium counterparts by a near-threshold resonant \textit{s}-wave bound state at low energy, similar to one that has been predicted in the triplet T-T system. While the energy-dependent cross sections span a wide range at low energy due to this \textit{s}-wave enhancement, they tend toward a common value at high energy where the scattering becomes effectively geometric in nature.
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