PHOTON ASYMMETRY IN THE BREMSSTRAHLUNG OF TRANSVERSELY POLARIZED ELECTRONS
There is a left-right asymmetry in the bremsstrahlung emitted by transversely polarized electrons analogous to the left-right asymmetry in Mott scattering. The magnitude of this effect has been calculated from the second Born approximation, where it appears in the cross terms between the matrix elements of order Ze/sup 3/ and these of order Z/sup 2/e/sup 5/. Principal contributions come from the Feynman diagram in which the photon is emitted between the Coulomb interactions with the nucleus, while the largest terms from the diagrams with the photon emitted before or after both Coulomb interactions are of relative order v/c compared to the principal terms. The contributions of all three diagrams to relative order (v/c)/sup 2/ are included in the final result. As is the case in Mott scattering, the asymmetry in bremsstrahlung depends only on intermediate states which lie on the energy shell. The reason for this has not been investigated here. It does not seem feasible to integrate the cross section over electron momenta analytically. In order to reduce geometric complexity, the calculation is performed in detail for forward electron momentum. The matrix elements for this case are listed explicitly so that other polarizationdependent effects may be conveniently calculated. An outline of the evaluation of the integrals which appear, and a discussion of the divergences associated with the no-cutoff limit of the Coulomb field, as they apply to bremsstrahlung, are included. (auth)
- Research Organization:
- Univ. of Pittsburgh
- NSA Number:
- NSA-17-006978
- OSTI ID:
- 4745193
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Vol. Vol: 129; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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