Quantum suppression of antihydrogen formation in positronium-antiproton scattering.

Quantum suppression of antihydrogen formation in positronium-antiproton scattering.
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DOI:
10.1038/s41467-017-01721-y
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发表时间:
2017-11-16
影响因子:
16.6
通讯作者:
Fabrikant II
Fabrikant II
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Kadyrov AS;Bray I;Charlton M;Fabrikant II

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反质子与低能正电子素原子的相互作用是一个基本的三体问题,其重要意义在于它对反氢的形成具有实用性。特别重要的是理解涉及激发的电子偶素状态的过程。直到最近,这些研究都是使用经典技术进行的。然而,它们变得不适用于低能量域。在这里,我们报告的结果,全面的量子计算,其中包括初始激发正电子偶素态的主量子数高达NI = 5。与早期工作的预期相反,对于ni> 3,反氢形成的横截面仅略有增加。我们解释这在量子抑制的反应在更高的角动量。此外,弹性散射的横截面大约高出两个数量级,我们将其归因于正电子素态的简并性。我们概述了我们的结果的一些实验结果。正电子素散射的有趣行为在反物质研究中有其作用。在这里,作者预测的量子抑制的截面的反氢形成的正电子素散射与反质子,包括激发态和使用收敛的紧耦合计算。
The interaction of antiprotons with low-energy positronium atoms is a fundamental three-body problem whose significance is its utility for formation of antihydrogen. Particular importance resides in understanding processes involving excited positronium states. Until recently such studies were performed using classical techniques. However, they become inapplicable in the low-energy domain. Here we report the results of comprehensive quantum calculations, which include initial excited positronium states with principal quantum numbers up to n i = 5. Contrary to expectation from earlier work, there are only muted increases in the cross-sections for antihydrogen formation for n i > 3. We interpret this in terms of quantum suppression of the reaction at higher angular momenta. Furthermore, the cross-sections for elastic scattering are around two orders of magnitude higher, which we attribute to the degeneracy of the positronium states. We outline some experimental consequences of our results. The intriguing behaviour of positronium scattering has its role in antimatter studies. Here the authors have predicted the quantum suppression of the cross-section for antihydrogen formation in positronium scattering with antiprotons, by including the excited states and using convergent close-coupling calculations.
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