强磁场中e~＋e~－→3γ过程的研究  

A Study of the e￣+e￣-→3γ Process in the Super-strong Magnetic Fields

作　　者：平加伦[1] 

机构地区：[1]南京大学天文系

出　　处：《天体物理学报》1994年第2期137-143,共7页

摘　　要：强磁场中的电磁辐射过程与自由空间的过程有着很大的差别。本工作就是对强磁场中的ｅ＾＋ｅˉ→３γ过程严格的量子电动力学处理，得到了一般情形下的截面与湮灭率的表达式。对静止湮灭作了数值计算，并与ｅ＾＋ｅˉ→γ和ｅ＾＋ｅˉ→２γ过程作了比较。比较结果表明三光子过程在弱磁场（～１０＾８Ｔ，中子星表面磁场强度）中，对低能光子（硬Ｘ射线）的发射有着不可忽略的贡献。The electromagnetic radiation process in the super─strong magnetic fields is much different from the process in the free space. The present work is to study the process e￣+e￣─→3γin super─strong magnetic field by using quantum electrodynamics (QED). The formulas of cross section and annihilation rate are obtained in the general case. A numerical calculation have been done for the rest annihilation, and the results are compared with the results of e￣+￣e→ and e￣+e￣─→2γ. The results show that the three photon annihilation process has a considerable contribution to the low─energy photon emission in the not too high magnetic field.

关 键 词：中子星 恒星磁场 Γ射线暴 强磁场 

分 类 号：P145.6[天文地球—天体物理]