Positronium Production and Scattering below Its Breakup Threshold.
Positronium Production and Scattering below Its Breakup Threshold.
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正电子的产生和散射低于其分解阈值。
DOI：
10.1103/physrevlett.115.223201
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发表时间：
2015
影响因子：
8.6
通讯作者：
Brawley SJ
中科院分区：
文献类型：
--
作者：
Brawley SJ
关于电子和正电子素以相同速度散射之间相似性的最新发现[Brawleyet等人，Science 330，789（2010）]已经引导我们在比先前获得的束能量低五倍的束能量下实现了可检测的正电子素原子通量，使得能够首次在能量范围内测量总截面。在与Ar和Xe的碰撞中，发现正电子偶素的总截面在探测的最低能量处最小，接近电子抛射体的Ramsauer-Townsend最小值。在入射能量约为5 eV的正电子素散射的情况下，已观察到额外的结构。
Recent findings on the similarity between electron and positronium scattering at the same velocity [Brawleyet al., Science 330, 789 (2010)] have guided us towards the realization of a detectable flux of positronium atoms at beam energies five times lower than previously obtained, enabling total cross sections to be measured in the energy rangefor the first time. In collision with Ar and Xe, the total cross sections of positronium are found to be smallest at the lowest energy probed, approaching those of the Ramsauer-Townsend minima for electron projectiles. Additional structure has been observed in the case of positronium scattering at incident energies around 5 eV.