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Compton scattering of 1. 12-MeV gamma rays by K-shell electrons of heavy elements

Journal Article · · Phys. Rev., A; (United States)
;
A study has been made of the Compton scattering of 1.12-MeV gamma rays by K-shell electrons of tin, tantalum, gold, lead, and thorium. K x rays of target atoms were detected in coincidence with the scattered gamma rays. A careful investigation of false coincidences has been carried out. The ratio dsigma/sub K//dsigma/sub F/ of the K-shell electron cross section to the Compton cross section for a free electron at rest was determined at serveral angles between 25degree and 120degree. The cross-section ratio in the case of gold and thorium is less than 1 at 25degree, larger than 1 in the neighborhood of 90degree, and close to 1 at 120degree. The experimental results are compared with theoretical calculations based on the incoherent-scattering-function approximation and a relativistic version of the impulse approximation. There is a need for a comprehensive relativistic calculation incorporating the effects of electron binding in intermediate states.
Research Organization:
Department of Physics, Indian Institute of Technology, Powai, Bombay 400 076, India
OSTI ID:
7115849
Journal Information:
Phys. Rev., A; (United States), Journal Name: Phys. Rev., A; (United States) Vol. 15:5; ISSN PLRAA
Country of Publication:
United States
Language:
English

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Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
74 ATOMIC AND MOLECULAR PHYSICS
ACTINIDES
BASIC INTERACTIONS
COMPTON EFFECT
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RANGE
GAMMA RADIATION
GOLD
INTERACTIONS
IONIZING RADIATIONS
K SHELL
LEAD
METALS
MEV RANGE
MEV RANGE 01-10
RADIATIONS
REFRACTORY METALS
SCATTERING
TANTALUM
THORIUM
TIN
TRANSITION ELEMENTS