Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei
Effect of a strong laser field on electron-positron photoproduction by relativistic nuclei
复制标题
DOI：
10.1103/physreva.81.062122
复制
发表时间：
2009-11
影响因子：
2.9
通讯作者：
A. Piazza;E. Lotstedt;A. Milstein;C. Keitel
中科院分区：
文献类型：
--
作者：
A. Piazza;E. Lotstedt;A. Milstein;C. Keitel
研究了强激光场对相对论核Bethe-Heitler光生过程的影响。激光场的传播方向与入射的高能光子的传播方向相同，因此在计算中完全考虑了激光场的传播。两种情况下被认为是详细的。在第一种情况下，入射光子在原子核静止坐标系中的能量远大于电子的静止能量。激光场的存在可能会显着抑制在不久的激光参数值的光生速率。在第二种情况下，入射光子在原子核静止坐标系中的能量小于并接近电子-正电子对产生阈值。激光场的存在允许成对产生过程，并且所获得的电子-正电子速率比仅存在激光和核场时大得多。在这两种情况下，我们已经观察到了强烈的依赖性的相互偏振的激光场和高能光子的速率，最有利的配置是与激光场和高能光子的线偏振在同一方向。原则上，所讨论的效果可以用目前可用的质子加速器和激光技术测量。«少
We study the influence of a strong laser field on the Bethe-Heitler photoproduction process by a relativistic nucleus. The laser field propagates in the same direction as the incoming high-energy photon, and it is taken into account exactly in the calculations. Two cases are considered in detail. In the first case, the energy of the incoming photon in the nucleus rest frame is much larger than the electron's rest energy. The presence of the laser field may significantly suppress the photoproduction rate at soon-available values of laser parameters. In the second case, the energy of the incoming photon in the rest frame of the nucleus is less than and close to the electron-positron pair-production threshold. The presence of the laser field allows for the pair-production process, and the obtained electron-positron rate is much larger than in the presence of only the laser and the nuclear field. In both cases, we have observed a strong dependence of the rate on the mutual polarization of the laser field and on the high-energy photon, and the most favorable configuration is with laser field and high-energy photon linearly polarized in the same direction. The effects discussed are, in principle, measurable with presently available protonmore » accelerators and laser technology.« less