Incoherent scattering of gamma rays by K-shell electrons. [Differential cross sections, 145 to 662 KeV]

Technical Report · Wed May 12 00:00:00 EDT 1976

DOI:https://doi.org/10.2172/7350769· OSTI ID:7350769

Spitale, G C; Bloom, S D

Differential cross sections for incoherent scattering by K-shell electrons were measured, using coincidence techniques, for incident photons having energies of 662 keV, 320 keV, and 145 keV. The spectral distributions of the scattered photons emerging at scattering angles from 20/sup 0/ to about 140/sup 0/ are reported. Target materials were iron, tin, holmium, and gold at 320 keV; tin and gold at 662 keV; and iron and tin at 145 keV. A typical energy spectrum consists of a scattered peak that is much narrower than would be expected from the bound state electron motion. The peak also, typically, reaches a broad maximum width for scattering angles between 45/sup 0/ and 60/sup 0/. Rather than monotonically increasing with atomic number the peak width reaches a broad maximum, generally, between Z = 50 and Z = 67, and then decreases with increasing atomic number. No Compton defect appears in any of the peaks to within +- 20 keV. A discussion of the expected magnitude of the Compton defect is included. The peak is superimposed on a continuum that diverges at the low end of the scattered photon spectrum for the following cases: gold, holmium, and tin targets for 320-keV incident photons; gold and possibly tin targets for 662-keV photons incident. This infrared divergence is expected on theoretical grounds and has been predicted. It is very nearly isotropic.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7350769
• Report Number(s): UCRL-52082; TRN: 76-022465
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
GOLD
PHOTON COLLISIONS
HOLMIUM
IRON
INCOHERENT SCATTERING
TIN
DIFFERENTIAL CROSS SECTIONS
ELECTRONIC STRUCTURE
ELECTRONS
ENERGY SPECTRA
K SHELL
KEV RANGE 100-1000
PHOTONS
COLLISIONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
FERMIONS
KEV RANGE
LEPTONS
MASSLESS PARTICLES
METALS
RARE EARTHS
SCATTERING
SPECTRA
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena