Bound and resonance states of positronic copper atoms
Bound and resonance states of positronic copper atoms
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DOI：
10.1088/1361-6455/aa8b3b
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
T. Yamashita;M. Umair;Y. Kino
中科院分区：
文献类型：
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作者：
T. Yamashita;M. Umair;Y. Kino
本文报道了正电子铜原子（e+Cu）的束缚态和S波共振态的理论计算。正电子是带正电荷的粒子，正电子原子与正电子之间存在吸引关联，采用高斯展开方法直接描述这种关联以及正电子原子与原子核之间的强排斥作用。正电子和电子之间的相关性比类似的Cu−系统中电子之间的相关性重要得多，尽管e+Cu中正电子偶素（Ps）的形成在基态结构中没有明确表达。共振态的计算与复杂的标度方法和确定以上的铜原子的第一激发态。低于Ps（n = 2）+ Cu+的共振态被归类为偶极系列，与一个简单的分析定律一致。比较了e+Cu与e+K的共振能和共振宽度，发现e+Cu偶极系的共振位置与e + K的共振位置相差相等，而e+K的共振位置与e+ Cu的共振位置相差不大。
We report a theoretical calculation for the bound and S-wave resonance states of the positronic copper atom (e+Cu). A positron is a positively charged particle; therefore, a positronic atom has an attractive correlation between the positron and electron. A Gaussian expansion method is adopted to directly describe this correlation as well as the strong repulsive interaction with the nucleus. The correlation between the positron and electron is much more important than that between electrons in an analogous system of Cu−, although the formation of a positronium (Ps) in e+Cu is not expressed in the ground state structure explicitly. Resonance states are calculated with a complex scaling method and identified above the first excited state of the copper atom. Resonance states below Ps (n = 2) + Cu+ classified to a dipole series show agreement with a simple analytical law. Comparison of the resonance energies and widths of e+Cu with those of e+K, of which the potential energy of the host atom resembles that of e+Cu, reveals that the positions of the resonance for the e+Cu dipole series deviate equally from those of e+K.