论文标题
带有h样离子的K壳电子的正上音的两光子歼灭
Two-photon Annihilation of Positrons with K-shell Electrons of H-like ions
论文作者
论文摘要
在完全相对论的QED框架内计算了具有电子结合的电子的正电子的两光子歼灭。与细胞核的相互作用是非扰动处理的，因此可以用重离子的强内壳进行歼灭进行计算。当最终表达式从最终表达式中准确消除了当发射光子之一接近低频限制时出现的红外发散。比较了多种碰撞能量和核电荷数量，比较了两光子和一光子歼灭过程的总横截面。事实证明，两光子歼灭通道在低和中Z离子的单光子通道上占主导地位，而对于高Z离子，情况会逆转。
The two-photon annihilation of a positron with an electron bound in the 1s state of a H-like ion is calculated within the fully relativistic QED framework. The interaction with the nucleus is treated nonperturbatively, thus allowing the calculations to be carried out for the annihilation with strongly-bound inner shells of heavy ions. Infrared divergences, appearing when one of the emitted photons approaches the low-frequency limit, are accurately eliminated from final expressions. The total cross section of the two-photon and one-photon annihilation processes are compared for a wide range of collision energies and nuclear charge numbers. It is demonstrated that the two-photon annihilation channel dominates over the one-photon channel for the low and medium-Z ions, whereas for the high-Z ions the situation reverses.
