Incoherent scattering of gamma rays by K-shell electrons. [145, 320, and 662 keV]

Journal Article · Fri Jul 01 00:00:00 EDT 1977 · Phys. Rev., A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.16.221· OSTI ID:7218477

Spitale, G C; Bloom, S D

Differential cross sections for incoherent scattering by K-shell electrons have been measured, using coincidence techniques, for incident photons having energies of 662, 320, and 145 keV. Observations were made of the spectral distributions of scattered photons emerging at scattering angles ranging from 20/sup 0/ to approximately 140/sup 0/. 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 spectrum generally displays a scattered quasi-Compton peak which is usually much narrower than would be expected from the bound-state electron motion. Rather than monotonically increasing with atomic number, the peak width typically reaches a broad maximum between Z = 50 and Z = 67 and then decreases with increasing atomic number. The peak, also typically, reaches a broad maximum width for scattering angles between 45/sup 0/ and 60/sup 0/. No Compton defect is observed to within +- 20 keV. Underlying the quasi-Compton peak is a continuum which 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 incident photons. This infrared divergence (IRD) is expected on general grounds and has been predicted. The observed IRD continuum is very nearly isotropic.

• Research Organization: Lawrence Livermore Laboratory, Livermore, California 94550
• OSTI ID: 7218477
• Journal Information: Phys. Rev., A; (United States), Vol. 16:1
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
GAMMA RADIATION
PHOTON-ATOM COLLISIONS
GOLD
HOLMIUM
IRON
TIN
ATOMIC NUMBER
BOUND STATE
COINCIDENCE METHODS
DIFFERENTIAL CROSS SECTIONS
GAMMA SPECTRA
INCOHERENT SCATTERING
K SHELL
KEV RANGE 100-1000
ATOM COLLISIONS
COLLISIONS
COUNTING TECHNIQUES
CROSS SECTIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
IONIZING RADIATIONS
KEV RANGE
METALS
PHOTON COLLISIONS
RADIATIONS
RARE EARTHS
SCATTERING
SPECTRA
TRANSITION ELEMENTS
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena