INELASTIC AND ANOMALOUS ELASTIC SCATTERING OF 88.03 keV GAMMA RAYS

Kane, P.P.; Basavaraju, G.; Lad, Saharsha M.; Varier, K. M.; Kissell, Logan M.; Pratt, R.H.

doi:10.1051/jphyscol:19879148

Cited by 3 publications

(5 citation statements)

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“…At all the investigated photon energies, the MF values were found to deviate enormously from the measured values in case of elements having the K/L shell ionisation thresholds in vicinity of the incident photon energy (Shahi et al, 1997;Shahi et al, 1998;Kumar et al, 2002a). Similar deviations were also observed for measurements at backward angles by Nayak et al (1992), Kane et al (1987) and Basavaraju et al (1995). These deviations were significantly reduced when ASFs were added to the MF values.…”

Section: Comparison Of Measured and Theoretical Elastic Scattering DIsupporting

confidence: 77%

Recent experimental studies of photon–atom scattering in the X-ray energy region

Singh

Puri

2006

Radiation Physics and Chemistry

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Section: Comparison Of Measured and Theoretical Elastic Scattering DIsupporting

confidence: 77%

Recent experimental studies of photon–atom scattering in the X-ray energy region

Singh

Puri

2006

Radiation Physics and Chemistry

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“…The error introduced by the digitization process was estimated by digitizing a few plots, whose numerical content is explicitly reported in the related publications. The reliability of the [58], [66], [69], [70], [76], [83], [91], [96], [98], [103], [107], [127], [132]- [135], [139]- [142], [148], [149], [153], [ [75], [113], [115], [127], [131], [135], [148], [ [76], [97], [113], [115], [131], [135], [ [75], [81], [88], [97], [115], [127], [131], [134], [135], [141], [148], [ , [69], [75],…”

Section: Experimental Datamentioning

confidence: 99%

“…[70], [75], [102], [107], [112], [148], [ [75], [92], [93], [100]- [102], [106], [110], [112]- [114], [118], [123], [124], [148]- [150], [155] digitized cross section values is hindered by the difficulty of appraising the experimental points and their error bars in plots that may span several orders of magnitude in logarithmic scale; these digitized data were not used in the validation analysis, if found incompatible with other measurements in the same experimental configuration (target element, incident photon energy and measured angle) reported in the literature in numerical form.…”

Section: Experimental Datamentioning

confidence: 99%

“…13.95-1408.1 0.5-165 151 [59], [60], [63]- [65], [78], [85]- [87], [102], [112], [113], [123], [124], [127], [148]- [150], [ [94], [102], [112], [113], [119], [120], [127], [131]- [133], [135], [137], [138], [148], [149] 79 Au 5.41-511 0.5-160 108 [66], [69], [70], [75], [89], [97], [102], [107], [112], [113], [115], [131]- [135], [137]- [140], [145], [146], [148], [149], [156] 80 Hg 22.1-1600 0.5-135 16…”

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confidence: 99%

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Photon Elastic Scattering Simulation: Validation and Improvements to Geant4

Batič

Hoff

Pia

et al. 2012

IEEE Trans. Nucl. Sci.

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Abstract-Several models for the simulation of photon elastic scattering are quantitatively evaluated with respect to a large collection of experimental data retrieved from the literature. They include models based on the form factor approximation, on S-matrix calculations and on analytical parameterizations; they exploit publicly available data libraries and tabulations of theoretical calculations. Some of these models are currently implemented in general purpose Monte Carlo systems; some have been implemented and evaluated for the first time in this paper for possible use in Monte Carlo particle transport. The analysis mainly concerns the energy range between 5 keV and a few MeV. The validation process identifies the newly implemented model based on second order S-matrix calculations as the one best reproducing experimental measurements. The validation results show that, along with Rayleigh scattering, additional processes, not yet implemented in Geant4 nor in other major Monte Carlo systems, should be taken into account to realistically describe photon elastic scattering with matter above 1 MeV. Evaluations of the computational performance of the various simulation algorithms are reported along with the analysis of their physics capabilities.

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“…However, on the high-energy sides of their measured profiles they noted discrepancies which were only partly explained by second-order S-matrix calculations. Kane et al (1987) included Compton scattering measurements of 88.03 keV gamma rays on a Bi target in their work which also included cross sections for elastic scattering and atomic photoeffect. They obtained an incoherent scattering value S(x,Z) at x = 6.3 A * 1 of 68.6±4.7 to compare with the non-relativistic value of 77 in the Hubbell et al (1975) compilation.…”

Section: S-matrix Incoherent Scattering Theorymentioning

confidence: 99%

An examination and assessment of available incoherent scattering s-matrix theory, also compton profile information, and their impact on photon attenuation coefficient compilations

Hubbell¹

1999

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The Klein-Nishina formulae for the differential and integral cross sections for Compton (or incoherent) scattering of x-ray photons from atomic electrons assume that the electrons are free (unbound) and at rest, which is a good approximation for photons of the order of 1 MeV or higher, particularly for low-Z target materials. The probability for dislodging bound electrons can be taken into account at least approximately by including an incoherent scattering function S(x,Z) in the differential Klein-Nishina formula. Currently available systematic theoretical tabulations of S(x,Z), where x is a momentum transfer variable dependent on the photon deflection angle and the photon incident energy do not use S-matrix theory with its claimed higher accuracy. The currently most widely-used S(x,Z) tables are non-relativistic. Recently (1998) Kahane has used the Ribberfors-Berggren relativistic treatment to compute systematic tables of S(x,Z). These new values of S(x,Z)have not yet been exploited for computing relativistic bound-electron incoherent scattering integrated cross sections a^, nor for triplet (pair production in the field of the atomic electrons) cross sections K e which also require S(x,Z) for their computation. The motion of the atomic electrons around the atomic nucleus gives rise to a Doppler broadening of the apparent energy of the incident photon, resulting in a corresponding broadening of the Compton "modified line" for a given deflection angle of the outgoing scattered photon. The shape of this broadened line is called the "Compton profile." One task of this report is to examine the usefulness and advantages, if any, of S-matrix theory in providing significantly more accurate values of photon interaction cross sections and attenuation coefficients. The other task of this report is to examine the available Compton profile literature and to explore what, if any, effect our knowledge of this line-broadening has on theoretical computations of photon incoherent scattering cross sections and total mass attenuation coefficients.

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INELASTIC AND ANOMALOUS ELASTIC SCATTERING OF 88.03 keV GAMMA RAYS

Cited by 3 publications

References 0 publications

Recent experimental studies of photon–atom scattering in the X-ray energy region

Recent experimental studies of photon–atom scattering in the X-ray energy region

Photon Elastic Scattering Simulation: Validation and Improvements to Geant4

An examination and assessment of available incoherent scattering s-matrix theory, also compton profile information, and their impact on photon attenuation coefficient compilations

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