Effect of an external magnetic field on the determination of E1M1 two-photon decay rates in Be-like ions

Effect of an external magnetic field on the determination of E1M1 two-photon decay rates in Be-like ions
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外部磁场对 Be 类离子 E1M1 双光子衰变率测定的影响

DOI:
10.1103/physreva.88.022513
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发表时间:
2013-07
期刊:
影响因子:
2.9
通讯作者:
Zou Yaming
Zou Yaming
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Grumer, Jon;Li Wenxian;Bernhardt Dietrich;Li Jiguang;Schippers Stefan;Brage Tomas;Jonsson Per;Hutton Roger;Zou Yaming

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本文报道了Z = 5 ~ 92的铍等电子序列离子在磁场诱导下的2s 2 p P-3(0)-> 2s(2)S-1(0)E1跃迁的从头算理论结果。本文提出,利用储存环中的共振复合,可以从类铍离子P-3(0)态的寿命中提取出E1 M1双光子跃迁2s 2 pP-3(0)-> 2s(2)S-1(0)的速率.这种实验方法涉及扰动外部磁场。这个领域的影响需要进行评估,以适当地提取从测量的衰减曲线的双光子率。磁场诱导的过渡率进行了仔细评估,它表明,与一个典型的存储环的场强,它是占主导地位的或相同的顺序为E1 M1率低和中Z离子。几个场强和离子的结果,我们也给出了一个简单的Z依赖的速率公式。我们估计,我们的模型的不确定性是在5%以内的低和中Z离子和更高电荷的离子略大。此外,我们评估了包括两个微扰态,P-3(1)和P-1(1)的重要性,它表明,排除P-1(1)微扰的影响高估率高达26%的中Z离子。(减)
In this work we report on ab initio theoretical results for the magnetic-field-induced 2s 2p P-3(0) -> 2s(2) S-1(0) E1 transition for ions in the beryllium isoelectronic sequence between Z = 5 and 92. It has been proposed that the rate of the E1M1 two-photon transition 2s 2p P-3(0) -> 2s(2) S-1(0) can be extracted from the lifetime of the P-3(0) state in Be-like ions with zero nuclear spin by employing resonant recombination in a storage ring. This experimental approach involves a perturbing external magnetic field. The effect of this field needs to be evaluated in order to properly extract the two-photon rate from the measured decay curves. The magnetic-field-induced transition rates are carefully evaluated, and it is shown that, with a typical storage-ring field strength, it is dominant or of the same order as the E1M1 rate for low-and mid-Z ions. Results for several field strengths and ions are presented, and we also give a simple Z-dependent formula for the rate. We estimate the uncertainties of our model to be within 5% for low-and mid-Z ions and slightly larger for more highly charged ions. Furthermore we evaluate the importance of including both perturber states, P-3(1) and P-1(1), and it is shown that excluding the influence of the P-1(1) perturber overestimates the rate by up to 26% for the mid-Z ions. (Less)
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