Delbrueck contribution in the elastic scattering of 1.115-MeV photons

Journal Article · Tue Mar 01 04:00:00 EST 2005 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.71.032724· OSTI ID:20650427

Kunwar, Bhakta; Bhadra, Arunava; Sen Gupta, Swapan K; Carney, J P.J.; Pratt, R H ^[1]

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1. University Science Instrumentation Center, North Bengal University, Darjeeling 734430 (India)

Differential cross sections for the elastic scattering of 1.115-MeV photons from tungsten (Z=74) and lead (Z=82) have been measured at angles ranging from 30 deg. to 135 deg., using a high purity coaxial germanium detector. The experimental results are compared with S-matrix theoretical calculations of Rayleigh scattering cross sections, which also include contributions arising from the nuclear Thomson amplitudes and the Delbrueck amplitude in lowest order Born approximation. The present experimental data at 1.115 MeV indicates that Delbrueck amplitudes calculated with lowest-order Born approximation, when combined with S-matrix Rayleigh scattering amplitudes, are sufficient, as has previously been observed at 1.332 MeV for a number of high-Z elements, and at 1.121 MeV and 1.173 MeV for Z=92. This result for Z=74 and Z=82 at 1.115 MeV provides further confirmation that the Delbrueck amplitudes calculated with lowest-order Born approximation are sufficient for energies at and below 1.332 MeV, in contrast to the situation at 2.754 MeV where Coulomb corrections to the Delbrueck amplitudes are significant for high-Z elements.

• OSTI ID: 20650427
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 71; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
AMPLITUDES
BORN APPROXIMATION
COULOMB CORRECTION
DIFFERENTIAL CROSS SECTIONS
ELASTIC SCATTERING
GE SEMICONDUCTOR DETECTORS
MEV RANGE
PHOTON-ATOM COLLISIONS
PHOTONS
RAYLEIGH SCATTERING
S MATRIX
TUNGSTEN