Low-energy l-mixing collisions of excited positronium with protons and antiprotons
Low-energy l-mixing collisions of excited positronium with protons and antiprotons
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激发正电子素与质子和反质子的低能混合碰撞
DOI：
10.1088/1361-6455/aa743c
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
M. Charlton
中科院分区：
文献类型：
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作者：
I. Fabrikant;A. Kadyrov;I. Bray;M. Charlton
研究了激发态电子偶素（Ps）原子与质子碰撞中的l-混合过程，Ps原子的主量子数n在4到8之间。我们首先表明，阈值理论的结果非常符合收敛的紧耦合计算。然后，我们将量子截面与半经典和经典理论的结果进行比较。在半经典理论中，Ps原子被量子力学地处理，而相对Ps-p运动被经典地描述。对于l-混合过程，量子和半经典结果之间有很好的一致性，而经典理论严重低估了l-混合截面。这些结论对于解释经典轨迹蒙特卡罗模拟和在实验设计中使用它们的数据是重要的。
We investigate l-mixing processes in collisions of excited positronium (Ps) atoms with protons in the range of the principal quantum number n of the Ps atom between 4 and 8. We show first that results of the threshold theory agree very well with convergent close-coupling calculations. We then compare quantum cross sections with results of semiclassical and classical theories. In the semiclassical theory, the Ps atom is treated quantum-mechanically, whereas the relative Ps-p motion is described classically. For l-mixing processes there is a good agreement between quantum and semiclassical results, whereas classical theory strongly underestimates the l-mixing cross sections. The conclusions are important for the interpretation of Classical Trajectory Monte Carlo simulations and the use of their data in the design of experiments.