Nonresonant photocreation of electron-positron pair on a nucleus in the field of a pulsed light wave |
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Authors: | A A Lebed’ S P Roshchupkin |
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Institution: | 1.Institute of Applied Physics,National Academy of Science of Ukraine,Sumy,Ukraine |
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Abstract: | The nonresonant Coulomb photocreation of electron-positron pair on a nucleus in the field of a pulsed light wave is theoretically
investigated. The approximation is examined when pulsewidth is considerably greater than the characteristic time of wave oscillations.
The interaction of an electron and a positron with a Coulomb potential of a nucleus is considered in the first order of perturbation
theory (the Born approximation). An analytic expression for the nonresonant differential cross section was obtained for the
range of moderately strong fields in the case relativistic and nonrelativistic energies. It is shown, that the nonresonant
cross section of Coulomb photocreation of nonrelativistic pair in the field of a pulsed light wave is two times larger than
the cross section of Coulomb photocreation in the absence of an external field. |
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