Measurement of Compton scattering on bound electrons by the coincidence method

Published on Nov 1, 2006in Radiation Physics and Chemistry2.858
· DOI :10.1016/J.RADPHYSCHEM.2005.07.026
Selim Pašić6
Estimated H-index: 6
(University of Zagreb),
Ksenofont Ilakovac6
Estimated H-index: 6
(University of Zagreb)
Sources
Abstract
A review of results of the new method for measuring the Compton scattering on bound electrons in germanium, introduced by the presented authors, is given. It is based on the application of two detectors that operate in the coincidence mode. One detector is used as the scatterer and the other as the detector of scattered radiation. Two conditions, simultaneity of pulses from the two detectors and constant energy sum, result in very clean spectra in broad energy regions. Normalization of the Compton spectra to the Ge K X-ray escape peaks, which are measured simultaneously with the Compton spectrum, gives reliable double-differential Compton-scattering cross sections on an absolute scale. Several versions of the impulse approximation are compared to the cross sections obtained by the present method for incident photon energies in the range from 60 to 105 keV. The non-relativistic impulse approximation gives the best agreement to the experimental data. We point out the suitability of the new method for an investigation of the incoherent scattering function at small photon momentum transfer.
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#1Selim Pašić (University of Zagreb)H-Index: 6
#2Milivoj Uroić (University of Zagreb)H-Index: 5
Last. Ksenofont Ilakovac (University of Zagreb)H-Index: 6
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Abstract Double-differential Compton cross sections at two incident photon energies of 68.9 and 70.8 keV (mercury Kα X-rays) at the scattering angle of about 172° were measured in germanium using the coincidence technique with a detector as the scatterer. The cross sections were determined by normalization of the Compton spectra to the peaks due to the escape of characteristic Kα and Kβ X-rays from the target detector. This new approach of determination of absolute-scale Compton cross sections c...
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#1Selim Pašić (University of Zagreb)H-Index: 6
#2Ksenofont Ilakovac (University of Zagreb)H-Index: 6
Abstract The differential cross section d 2 σ/ d E d Ω was measured at an incident photon energy of 105.3 keV in germanium on absolute scale. The measurements were made using two high purity Ge detectors that operated in a coincidence mode. One detector served as the target and detector of ejected electrons, and another as the detector of Compton-scattered photons. It was found that fast (multiple) cascades have little influence on the data of the 105.3 keV crossover transition. An improved dete...
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#1Selim Pašić (University of Zagreb)H-Index: 6
#2Ksenofont Ilakovac (University of Zagreb)H-Index: 6
The double-differential cross section d2σ/dΩdE for Compton backscattering in germanium was measured at the photon energy of 86.5 keV. The experiment
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#1P.P. Kane (IITs: Indian Institutes of Technology)H-Index: 4
Abstract Studies of inelastic scattering of X-rays and γ-rays of energies higher than 30 keV performed with the help of NaI(Tl) and semi-conductor detectors of moderate and good resolution, respectively, are considered in the first part of this review. Theoretical treatments based on the non-relativistic ( e 2 /2 mc 2 ) A 2 interaction term, the impulse approximation, the incoherent scattering function approximation, the (− e / mc ) P·A interaction term, and the relativistic second order S matri...
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Abstract X-ray scattering by individual atomic electrons is known as Compton scattering if the simplifying approximation is invoked that the target electrons are initially free and rest, in which case the differential and integral scattering cross sections can be computed using the compact analytical expressions given by Klein and Nishina in 1929. In real atoms the electrons are neither free nor at rest, resulting in departures from the Klein-Nishina expressions. These departures have been estim...
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The differential cross section for Compton scattering d2σ/dΩdE in germanium (Z=32) was measured using the sensitive volume of a Ge detector as the s
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#1Selim PašićH-Index: 6
#2Ksenofont IlakovacH-Index: 6
The differential cross section, d^2sigma/d omega dE, for Compton scattering in germanium was measured by observing detector-to-detector scattering using the coincidence method. The experiment was performed at incident energies of 55.791 and 54.612 keV and scattering angle of J = 180°. The method applied is compared with the corresponding measurements in the singles mode, i.e. using the source-scatterer-detector assembly. We found that the coincidence method yields better results, especially in t...
#1T. Surić (University of Pittsburgh)H-Index: 6
#2P.M. Bergstrom (University of Pittsburgh)H-Index: 5
Last. R. H. Pratt (University of Pittsburgh)H-Index: 34
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We have developed an exact second-order S-matrix code for the relativistic numerical calculation of cross sections for Compton scattering of photons by bound electrons within the independent-particle approximation. We find good agreement with less exact treatments in regions where such theories are valid, recovering the impulse approximation and the soft-photon infrared divergence. We do not find agreement with an earlier calculation of Whittingham. We compare with recent scattering experiments ...
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#1M. SchumacherH-Index: 1
#2F. SmendH-Index: 1
Last. I BorchertH-Index: 1
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Using the form factor approximation and nonrelativistic Coulomb wavefunctions, cross section profiles for Compton scattering of gamma rays are calculated for all subshells of the atom. Spherical coordinate are used in order to facilitate a straightforward application of self-consistent wavefunctions. Relativistic energy and momentum relations are applied. Numerical data are presented, for Egamma =279 keV and the K-, L- and M-subshells of copper and lead. Comparisons are made with cross section p...
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Abstract The photons scattered by the Compton effect can be used to characterize the physical properties of a given sample due to the influence that the electron density exerts on the number of scattered photons. However, scattering measurements involve experimental and physical factors that must be carefully analyzed to predict uncertainty in the detection of Compton photons. This paper presents a method for the optimization of the geometrical parameters of an experimental arrangement for Compt...
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#1E. G. Drukarev (MPG: Max Planck Society)H-Index: 1
#2A. I. Mikhailov (MPG: Max Planck Society)H-Index: 1
Last. Ivan A. Mikhailov (UCF: University of Central Florida)H-Index: 15
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We calculate the photon energy distribution and the total cross section for the Compton scattering on the K electrons for the case when the photon wave length is much smaller than the size of the K shell. We show that at the energies of the order of the binding energy I of the K electron most part of the spectrum is governed by the low-energy behavior. The total cross section has a local maximum at the energies (1.5-2)I, reaching the values of the order 1 barn. At higher photon energies the spec...
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