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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 |
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| Cite this article: |
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LIU Dang-Bo, CHEN Lei, LING Jia-Jie et al 2005 Chin. Phys. Lett. 22 1556-1559 |
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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.
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| Keywords:
95.30.Jx
95.85.Pw
98.70.Rz
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Published: 01 June 2005
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