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Positron-electron pairs emitted from metallic and oxide surfaces

机译:从金属和氧化物表面发射的正电子对

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If a positron impacts onto a surface, it may lead to the emission of a positron-electron pair. We have commissioned a laboratory-based positron source and performed a systematic study on a variety of solid surfaces. In a symmetric emission geometry we can explore the fact that positrons and electrons are distinguishable particles. Following fundamental symmetry arguments we have to expect that the available energy is shared unequally among positrons and electrons. Experimentally we observe such a behavior for all materials studied. We find a universal feature for all materials in the sense that, on average, the positron carries a larger fraction of the available energy. A scattering model accounts qualitatively for the observed energy sharing in positron-electron pair emission. A comparison of the intensity levels from the different materials reveals a monotonic relation between the singles and pair coincidence count rates.
机译:如果正电子撞击到表面,则可能导致正电子-电子对的发射。我们已经委托了一个基于实验室的正电子源,并对各种固体表面进行了系统的研究。在对称发射几何中,我们可以探索正电子和电子是可区分的粒子这一事实。遵循基本对称性的论点,我们必须期望可利用的能量在正电子和电子之间平均分配。实验上,我们观察到了所有研究材料的这种行为。我们发现所有材料都有一个通用特征,即平均而言,正电子携带的可利用能量占较大比例。散射模型定性地解释了在正电子-电子对发射中观察到的能量共享。不同材料强度水平的比较揭示了单打和配对重合计数率之间的单调关系。

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