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arXiv 1604.01488physics.atom-ph
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精确的跃迁几率测量--原子多体理论的直接检验

An exacting transition probability measurement - a direct test of atomic many-body theories

T. Dutta, D. De Munshi, D. Yum, R. Rebhi, M. Mukherjee

摘要:

提出了一种新的协议,用于测量分支分数的氢原子只有统计有限的不确定性,并证明了衰减的P $_{3/2}$水平的钡离子,精度低于$0.5\%$。像钡离子这样的重类氢原子是基础物理学的试验台,例如原子宇称破坏,它们也是理解恒星核合成的关键。为了通过测量钡离子的原子宇称破缺来得出标准模型之外的可能物理学的明确结论,有必要以比$1\%$更好的精度测量低位激发态的偶极跃迁几率。此外,提高我们的理解的$\it{barium-puzzle}$在钡星需要分支分数数据的核合成的适当建模。我们的测量是第一个提供对钡离子的量子多体计算的直接测试,精度低于1%,更重要的是没有已知的系统不确定性。这里提出的独特的测量协议可以很容易地扩展到任何衰变与两个以上的通道,因此铺平了道路,测量其他氢原子的分支分数没有显着的系统不确定性。

英文摘要:

A new protocol for measuring the branching fraction of hydrogenic atoms with only statistically limited uncertainty is proposed and demonstrated for the decay of the P$_{3/2}$ level of the barium ion, with precision below $0.5\%$. Heavy hydrogenic atoms like the barium ion are test beds for fundamental physics such as atomic parity violation and they also hold the key to understanding nucleo-synthesis in stars. To draw definitive conclusion about possible physics beyond the standard model by measuring atomic parity violation in the barium ion it is necessary to measure the dipole transition probabilities of low-lying excited states with precision better than $1\%$. Furthermore, enhancing our understanding of the $\it{barium-puzzle}$ in barium stars requires branching fraction data for proper modelling of nucleo-synthesis. Our measurements are the first to provide a direct test of quantum many-body calculations on the barium ion with precision below one percent and more importantly with no known systematic uncertainties. The unique measurement protocol proposed here can be easily extended to any decay with more than two channels and hence paves the way for measuring the branching fractions of other hydrogenic atoms with no significant systematic uncertainties.

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