Theory of electron induced reactions. Progress report, May 1, 1980-April 30, 1981. [Ohio Univ]
(I) The problem of finite-size effects in virtual photon spectra was studied from several directions. It was found that a model-independent correction to the spectrum could be defined for energies up to 200 MeV. It is shown, however, that drastically different current distributions for an M1 transition all share the same transition radius and produce the same correction to the M1 virtual spectrum. This insensitivity to details of the transition is evidently due to a predominance of low-momentum-transfer components, which selects only comparatively low moments of the corresponding form factors. Simultaneous correction for finite size and Coulomb forces (finite charge) was studied, and an alarming interaction between the two corrections was found. (II) Coulomb distortion effects in pair production were also calculated. The distortion factor, which is the ratio of the total pair production cross section with Coulomb distortion to the plane-wave (Bethe-Heitler) result, is shown as a function of photon energy for Z = 92. (III) Some work was also done on pion electroproduction. The model showed good agreement with available experimental data. 8 figures. (RWR)
- Research Organization:
- Ohio Univ., Athens (USA)
- DOE Contract Number:
- AC02-79ER10397
- OSTI ID:
- 6673241
- Report Number(s):
- DOE/ER/10397-2; TRN: 81-004417
- Country of Publication:
- United States
- Language:
- English
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653003* - Nuclear Theory- Nuclear Reactions & Scattering