DELBRUCK SCATTERING OF 17-Mev PHOTONS (in German)
Differential cross sections were measured for the small angle scattering of gamma rays by iron, silver, tantalum, lead, and uranium with 17-Mev photons from Li/sup 7/(p, gamma )Be/sup 8/ at mean four momentum transfers q of 0 5 mc and 1.3 mc and with 7-Mev photons from F/sup 19/(p, alpha gamma )O/sup 16/ at mean four momentum transfer of 0.5 mc. Under these experimental conditions only Compton, Rayleigh, and possibly Delbruck scattering are of importance. Extrapolation of known theoretical results to higher energies shows, that Rayleigh and Compton scattering from bound electrons should depend only on q for small angles, small q, and fixed Z. Using this it follows, that at 17 Mev and q approximately 0.5 mc an additional scattering process must be present, which increases with growing Z and which is negligible in the measurements at 17 Mev with q approximately 1.3 mc and at 7 Mev with q approximately 0.5 mc. The results are in qualitative agreement with the approximate theory for Delbruck scattering of Bethe and Rohrlich, however experimental cross sections at 17 Mev and q approximately 0.5 mc are about a factor of 1.6 lower than those predicted by this theory. This discrepancy is not unexpected, since exact calculations of Delbruck scattering amplitude from Kessler and Zernik at 2.62 Mev and 6.14 Mev show even greater deviations in the same sense. (auth)
- Research Organization:
- Universitat, Freiburg i.B.
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-011745
- OSTI ID:
- 4723467
- Journal Information:
- Z. Physik, Journal Name: Z. Physik Vol. Vol: 170
- Country of Publication:
- Country unknown/Code not available
- Language:
- German
Similar Records
IMAGINARY PART OF THE DELBRUCK SCATTERING AMPLITUDE
Interference between Rayleigh, Delbruck, and nuclear resonance scattering processes
Evidence for destructive interference between Rayleigh and Delbruck scattering for 6. 8--11. 4-MeV photons
Journal Article
·
Sat Oct 15 00:00:00 EDT 1960
· Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D
·
OSTI ID:4111111
Interference between Rayleigh, Delbruck, and nuclear resonance scattering processes
Journal Article
·
Sat Oct 01 00:00:00 EDT 1983
· Phys. Rev. C; (United States)
·
OSTI ID:5593798
Evidence for destructive interference between Rayleigh and Delbruck scattering for 6. 8--11. 4-MeV photons
Journal Article
·
Fri Sep 01 00:00:00 EDT 1978
· Phys. Rev., C; (United States)
·
OSTI ID:6663756