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arXiv 0705.1907physics.atom-ph
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隧道区库仑场和laser场产生的电子-正电子对

Electron-positron pair creation by Coulomb and laser fields in the tunneling regime

M. Yu. Kuchiev, D. J. Robinson

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15 pages, 4 figures
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摘要：

本文研究了在核库仑场和强激光场作用下的电子-正电子对的产生。首次解析地得到了该对的能谱和角分布。每个轻子的能谱都有一个尖锐的最大值，其位置远高于激光场任何偏振的阈值。轻子的角分布取决于偏振：对于线偏振，两个轻子主要沿着激光束方向运动;对于圆偏振，轻子以激光束为中心的薄壁圆锥体发射。发现的光谱和角分布的强度和频率的字段，和频率无关的总对创建率符合先前已知的结果。提出了一种新的计算方法--邻位近似法，它利用了电子对产生发生在原子核附近的事实。

英文摘要：

Electron-positron pair creation due to combined nuclear Coulomb and strong laser fields is investigated for the tunneling regime. The energy spectra and angular distributions of the pair are found analytically for the first time. The energy spectrum for each lepton exhibits a sharp maximum located well above the threshold for any polarization of the laser field. The angular distributions of leptons depend on the polarization: for the linear polarization both leptons move predominantly along the laser beam direction; for the circular polarization leptons are emitted in a thin-walled cone centered on the laser beam. The spectral and angular distributions found are governed by the intensity and frequency of the field, and the frequency independent total pair creation rates comply with the previously known results. A new method of calculation - the vicinal approximation - which uses the fact that the pair production takes place in the close vicinity of the nucleus, is suggested.

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