laser囚禁$^{6}$ He原子$β$衰变中Li离子的电荷态分布
Charge-state distribution of Li ions from the $β$ decay of laser-trapped $^{6}$He atoms
摘要：
背景：核$β$衰变后原子末态的精确测定在许多实验中起着重要的作用。特别是，核$β$衰变后离子的电荷态分布对于以改进的精度确定$β-ν$角相关是重要的。目的：我们的测量旨在提供测试理论计算的基准。方法：利用处于亚稳态$(1s2s,~{^3S_1})$和处于磁光阱限制的$(1s2p,~{^3P_2})$态的$^6{\rm He}$原子测量了电场中$^6{\rm He}$的$β$衰变后产生的Li $^{n+}$离子的运动学。推导了电子的脱落几率，包括它们与离子能量的关系。结果如下：我们发现显着的差异，在不同的电荷状态的锂离子的分数相对于最近的计算，并讨论了一个合理的解释。我们还指出，没有解释相同的计算和以前的测量的锂离子能量依赖性的电荷分布从电子基态的衰变之间的巨大差异。
英文摘要：
Background: The accurate determination of atomic final states following nuclear $β$ decay plays an important role in many experiments. In particular, the charge state distributions of ions following nuclear $β$ decay are important for determinations of the $β-ν$ angular correlation with improved precision. Purpose: Our measurement aims at providing benchmarks to test theoretical calculations. Method: The kinematics of Li$^{n+}$ ions produced following the $β$ decay of $^6{\rm He}$ within an electric field were measured using $^6{\rm He}$ atoms in the metastable $(1s2s,~{^3S_1})$ and in the $(1s2p,~{^3P_2})$ states confined by a magneto-optical trap. The electron shake-off probabilities were deduced including their dependence on ion energy. Results: We find significant discrepancies on the fractions of Li ions in the different charge states with respect to a recent calculation and discuss a plausible explanation. We also point out that there is no explanation for a large discrepancy between the same calculation and a previous measurement of the Li-ion energy dependence of the charge distribution from decays of the electronic ground state.
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