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Abstract：
In this paper,the photoproduction of the relativistic para-positronium and muonium,similar to the Primakoff effect,is calculated using the perturbation expansion of the quantized composite field theory and relativistic B-S wave functions.A new term multiplied to the form factor is obtained,which makes the amplitudes different from what one obtains from the point-model calculation usually used in this kind of processes.It suggests that the same effect mentioned above may occur in the ordinary primakoff effect too.
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References
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. ON NUCLEAR SINGLE-PARTICLE POTENTIALS（Ⅲ）SINGLEPARTICLE ENERGIES DETERMINED BY THE NONHERMITIAN POTENTIAL Uαβ=Mαβ（εβ）. Chinese Physics C,
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