Investigations of positronium formation and destruction using 3gamma/2gammaannihilation-ratio measurements.
Investigations of positronium formation and destruction using 3gamma/2gammaannihilation-ratio measurements.
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使用 3gamma/2gamma 湮灭比测量研究正电子素的形成和破坏。
DOI：
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发表时间：
2004
影响因子：
8.6
通讯作者：
E. Surdutovich
中科院分区：
文献类型：
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作者：
W. Kauppila;E. Miller;H. Mohamed;K. Pipinos;T. Stein;E. Surdutovich
研究了4~40 eV正电子与Ne、Ar、Kr、CO_2和O_2碰撞产生的正电子素(Ps)，方法是测量两条伽马射线信号的比值，这两条伽马射线的符合是由(A)三次正电子湮没和(B)铝散射单元表面的对位-正电子衰变和破坏引起的两次正电子湮灭。这些比率提供了证据，涉及与铝表面的邻位-Ps相互作用的动能依赖性，在该表面的Ps形成势，以及对于CO2和O2，Ps是与内轨道电子形成的事实。
Positronium (Ps) produced by 4 to 40 eV positrons colliding with Ne, Ar, Kr, CO2, and O2 is investigated by measuring the ratio of signals of two gamma rays in coincidence resulting from (a) three gamma annihilation of ortho-Ps and (b) two annihilation gamma rays due to para-Ps decay and destruction of ortho-Ps at an aluminum scattering cell surface. These ratios provide evidence that relates to the kinetic energy dependence of ortho-Ps interactions with an aluminum surface, the Ps formation potential at this surface, and the fact that Ps is being formed with inner orbital electrons for CO2 and O2.