Experimental determination of absolute-scale compton cross sections using the K X-ray escape and a comparison with three versions of the impulse approximation

Published on Aug 1, 2005in Radiation Physics and Chemistry2.858
· DOI :10.1016/J.RADPHYSCHEM.2005.04.001
Selim Pašić6
Estimated H-index: 6
(University of Zagreb),
Milivoj Uroić5
Estimated H-index: 5
(University of Zagreb)
+ 4 AuthorsKsenofont Ilakovac6
Estimated H-index: 6
(University of Zagreb)
Sources
Abstract
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 can also be applied in widely used single-mode measurements (source–scatterer–detector assembly). Our analysis shows that the new method is especially convenient and accurate at lower incident photon energies above the K-edge in the target atoms. The experimental results are compared with the non-relativistic impulse approximation, the frequently used simplified version of the relativistic impulse approximation and the non-relativistic impulse approximation used with the relativistic expression for the atomic electron momentum in the direction of the photon momentum transfer. Contrary to our expectation, the non-relativistic impulse approximation clearly gives the best agreement with the experimental data in the region of the Compton peak.
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References22
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Abstract Compton scattering on electrons in materials in the vicinity of low-energy photon-emitting atoms and in the vicinity of the detector sensitive volume causes a continuous distribution below the full-energy peak (the “shoulder”). To study effects of the near-source Compton scattering, a collimator was used in front of a planar germanium detector to reduce the near-detector scattering. The measurements show that even a small mass in vicinity of emitting atoms, such as that of a standard ca...
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#1A.M.R. Kumar (Panjab University, Chandigarh)H-Index: 5
#2J.S. Shahi (Panjab University, Chandigarh)H-Index: 11
Last. Nirmal Singh (Panjab University, Chandigarh)H-Index: 24
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Abstract Inelastic scattering differential cross-sections for the 22.1 keV photons have been measured in Be, C, Mg, Al, S, Ti, Fe, Cu, Zn, As, Se, Y, Zr, Ag, In, Sn, Te, Gd, Dy, Ho and Tm elements at an angle of 133°. The measurements were performed under vacuum using an annular source of 109 Cd radioisotope as photon source and a planar HPGe detector. The measured inelastic scattering cross-sections are compared with those calculated using the Klein–Nishina cross-section for Compton scattering ...
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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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#1N. Govinda Nayak (MU: Mangalore University)H-Index: 8
#2Gerald Pinto (MU: Mangalore University)H-Index: 3
Last. K. Siddappa (MU: Mangalore University)H-Index: 16
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Abstract Whole atom differential incoherent scattering cross sections for 59.54 keV γ -rays were measured for a number of elements in the region 29⩽ Z⩽ 82 at scattering angles 90, 60, 45 and 30° employing a reflection geometry set up and a graded shielding arrangement. A 6 cm 3 HPGe detector was used to detect the scattered γ -rays. All the 49 cross sections reported in this paper constitute the first experimental measurement and serve to fill the existing gaps in the cross-section data. The com...
Source
The spectrum of bremsstrahlung due to photoelectrons ejected by incident photons of energy 59.5 keV was measured on an absolute scale. A coincidence experimental setup with two high-purity germanium detectors was used. One detector served as the target as well as the detector of ejected electrons and another (second) detector served as the detector of bremsstrahlung radiation. The applied experimental method gives a very clean bremsstrahlung spectrum which can be reliably determined on an absolu...
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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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#1Ibrahim S. Elyaseery (Universiti Sains Malaysia)H-Index: 4
#2A. Shukri (Universiti Sains Malaysia)H-Index: 10
Last. D.A. Bradley (UM: University of Malaya)H-Index: 41
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Abstract Incoherent scattering cross-sections for 11 moderate to high atomic number elements have been experimentally determined using 59.54 keV gamma rays emitted by the radionuclide 241 Am. Measurements were performed using a standard back-scattering geometry set up to obtain scattering angles of 145°, 154° and 165°. Resulting photon momentum transfers were in the range 4.58⩽ x ⩽4.76 A −1 . High purity (better than 99.9%) foils of Cu, Zn, Zr, Nb, Mo, Ag, Cd, In, Sn, Ta and W were used as targe...
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#1Aniruddha Deb (Bose Institute)H-Index: 26
#2S.K. SahaH-Index: 2
Last. Arun Kumar Chatterjee (Bose Institute)H-Index: 5
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Abstract The electron momentum anisotropy of indium phosphide has been studied by measuring the directional Compton profiles of indium phosphide single crystals with the use of radiation from an 241 Am gamma source. Three different samples, cut along the [100], [110] and [111] planes, were used. The experimental anisotropy has been compared with the results based on the linear combination of Gaussian orbitals (LCGO) method. The agreement is very good with our theoretical results. It is found tha...
Source
#1K. Siddappa (MU: Mangalore University)H-Index: 2
#2N. Govinda Nayak (MU: Mangalore University)H-Index: 8
Last. K M Balakrishna (MU: Mangalore University)H-Index: 7
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#2A. ShukriH-Index: 10
Last. D.A. BradleyH-Index: 41
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Cited By1
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#1Selim Pašić (University of Zagreb)H-Index: 6
#2Ksenofont Ilakovac (University of Zagreb)H-Index: 6
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 Compt...
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