Chin. Phys. Lett.  2005, Vol. 22 Issue (6): 1556-1559    DOI:
Original Articles |
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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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.
Keywords: 95.30.Jx      95.85.Pw      98.70.Rz     
Published: 01 June 2005
PACS:  95.30.Jx (Radiative transfer; scattering)  
  95.85.Pw (γ-ray)  
  98.70.Rz (γ-ray sources; γ-ray bursts)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2005/V22/I6/01556
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