Accurate determination of Compton backscattering in germanium at 86.5 keV on an absolute scale

Scientific paper - Original scientific paper

• Author: Selim Pašić
• Author: Ksenofont Ilakovac
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

The double-differential cross section d2σ/dΩdE for Compton backscattering in germanium was measured at the photon energy of 86.5 keV. The experimental setup with two high-purity germanium detectors operating in the coincidence mode was applied. A multiline radioactive source of ^155_63Eu was used as the source of photons. The Compton spectrum with a very small background was obtained. A fast cascade was found to little influence the data due to the 86.5 keV crossover transition. The contribution of a group of processes, which is described as double cross talk between the two detectors, was also studied and results of calculations show their weak intensity. The calculations of other processes were made as in our earlier papers. The values of d2σ/dΩdE were determined to an accuracy of better than 4% on an absolute scale in a broad energy region. The calculated values using the impulse approximation with hydrogenlike wave functions do not reproduce well the cross sections in some energy regions.

• Keywords (english): Compton backscattering in germanium; photon energy of 86.5 keV; two HP germanium detectors operating in the coincidence mode; values of d^2 sigma/d Omega dE
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review A
• Numbering: vol. 61, no. 3, pp. 32722-6
• p-ISSN: 1050-2947
• DOI: https://doi.org/10.1103/PhysRevA.61.032722
• URN:NBN: urn:nbn:hr:217:063396
• Publication: 2000
• Document URL: http://dx.doi.org/10.1103/PhysRevA.61.032722
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2000) by the American Physical Society.
• Created on: 2019-10-10 18:58:08