Matching Condition in γ-γ Annihilation Absorption
LIU Dang-Bo, CHEN Lei, LING Jia-Jie, YOU Jun-Han
Institute for Space and Astrophysics, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240
Matching Condition in γ-γ Annihilation Absorption
LIU Dang-Bo;CHEN Lei;LING Jia-Jie; YOU Jun-Han
Institute for Space and Astrophysics, Department of Physics, Shanghai Jiao Tong University, Shanghai 200240
关键词 ：
95.30.Jx ,
95.85.Pw ,
98.70.Rz
Abstract ： Two-photon annihilation (γ-γ reaction) is an important absorption mechanism in γ-ray physics and γ-ray astronomy. Using the markedly simplified direction-averaged cross section of annihilation σ(ω, ω’) for a normal isotropic ambient radiation field around the γ-ray source, we obtain a matching condition for the energies of two interacting photons, which ensures the attainment of the maximum annihilation probability. This is a new result that is helpful to obtain a better understanding for the absorption behaviour in the γ-γ annihilation process, and this predicts some possible line-like absorption structures in the emergent γ-ray continuous spectra. Some inferences of the matching condition are also presented.
Key words ：
95.30.Jx
95.85.Pw
98.70.Rz
出版日期: 2005-06-01
引用本文:
LIU Dang-Bo;CHEN Lei;LING Jia-Jie; YOU Jun-Han. Matching Condition in γ-γ Annihilation Absorption[J]. 中国物理快报, 2005, 22(6): 1556-1559.
链接本文:
https://cpl.iphy.ac.cn/CN/
或
https://cpl.iphy.ac.cn/CN/Y2005/V22/I6/1556
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