隧穿e^+ e^-光生过程中的势垒控制
Barrier control in tunneling e^+ e^- photoproduction
摘要：
在一个新的实验装置中研究了强低频激光场和弱高频激光场同向传播并与相对论原子核正面碰撞的超导电子-正电子对产生。在原子核静止系中强场处于亚临界，弱场频率低于并接近电子对产生阈值的极限下，解析地计算了正负电子对产生率。通过改变弱场的频率，可以大大降低隧穿势垒。因此，隧道对生产被证明是可观察到的与目前可用的技术。
英文摘要：
Tunneling electron-positron pair production is studied in a new setup in which a strong low-frequency and a weak high-frequency laser field propagate in the same direction and collide head-on with a relativistic nucleus. The electron-positron pair production rate is calculated analytically in the limit in which in the nucleus rest frame the strong field is undercritical and the frequency of the weak field is below and close to the pair production threshold. By changing the frequency of the weak field one can reduce the tunneling barrier substantially. As a result tunneling pair production is shown to be observable with presently available technology.
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