强激光场与轫致辐射γ射线或相对论离子碰撞产生非微扰正负电子对的对比研究
Comparative study of nonperturbative electron-positron pair production by intense laser fields colliding with either bremsstrahlung $γ$-rays or relativistic ions
浏览论文内容
中文总结 AI 辅助
该研究对比了强激光场与轫致辐射γ射线、相对论离子碰撞产生非微扰正负电子对的过程，发现合适参数下二者总速率物理性质相近，可利用前者实验模拟后者。
中文摘要 AI 辅助
众所周知，在强场环境中可产生正负电子对，这类环境分为两种情况：(i) 强激光场与高能γ光子构成的环境（非线性Breit-Wheeler过程）；(ii) 强激光场与原子核库仑场构成的环境（非线性Bethe-Heitler过程）。这两种过程在激光场进入非微扰区域的相互作用范围内都极具研究价值。目前多个实验合作组正致力于首次探测非微扰Breit-Wheeler过程，相关实验利用强激光脉冲和基于轫致辐射的γ射线源。相比之下，非线性非微扰Bethe-Heitler过程的实验观测仍需等待未来实现，因为其技术实现目前更具挑战性。不过，我们的对比研究表明，当适当选择轫致辐射驱动的非微扰Breit-Wheeler过程的参数时，过程(i)和(ii)的总速率物理性质会变得非常相似。从这个意义上说，即将开展的非线性Breit-Wheeler过程实验也可用于密切“模拟”目前难以观测的非线性Bethe-Heitler过程。
英文摘要
It is well known that electron-positron pairs can be created in the strong-field environments formed by (i) a high-intensity laser field and a high-energy $γ$-photon (nonlinear Breit-Wheeler process) or (ii) a high-intensity laser field and a nuclear Coulomb field (nonlinear Bethe-Heitler process). Both of these processes are particularly interesting in the interaction regime where the laser field enters nonperturbatively. Various experimental collaborations are currently aiming at detecting for the first time the nonperturbative Breit-Wheeler process, by exploiting high-intensity laser pulses and $γ$-ray sources based on bremsstrahlung. In contrast, an experimental observation of the nonlinear, nonperturbative Bethe-Heitler process still lies further ahead in the future because its technical realization appears at present more challenging. Our comparative study shows, however, that the physical properties of the total rates for the processes (i) and (ii) can become remarkably similar when the parameters for the bremsstrahlung-driven nonperturbative Breit-Wheeler process are properly chosen. In this sense, the upcoming experiments on the nonlinear Breit-Wheeler process could also be used to closely ``simulate'' the currently hard to observe nonlinear Bethe-Heitler process.
