Elastic scattering of 88.03-keV γ rays

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

“…The MFASF values exhibited good agreement with the measured values for all the elements under investigation, except for Pb (B K ¼ 88.004 keV) and Bi (E K ¼ 90.526 keV), where these were found to be enormously ($28 times) smaller and higher by 31%, respectively, than the measured values. Our measured values were found to agree with those reported by Basavaraju et al (1995). At 59.54 keV photon energy, the MFASF and SM values for low Z elements (Zo26) were found to agree well with our measured values.…”

“…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.…”

Investigation of the Angle Dependence of the Photon–Atom Anomalous Scattering Factors

“…Agreement between this approach and experiment is rather good over most regimes of X-ray and y-ray energy -not too close to edges -and all scattering angles, for all elements that have been tested (Kane et al, 1986;Basavaraju, Kane, Kissel & Pratt, 1994;Basavaraju, Kane, Lad, Kissel & Pratt, 1995). Although these calculations require considerable computing resources, a substantial body of S-matrix data has been accumulated (see for example the description of Kissel et al, 1995) and continuing improvements to the code and method have made evaluation much less costly.…”

Measurements of elastic scattering cross sections for 25.2, 28.5, 37.4, 36.8, and 42.2 keV X‐ray photons in elements with 22 ≤ Z ≤ 83

“…[5,11,12] The S-matrix calculations are based on second-order relativistic calculation in the independent particle approximation, which assumes the independent electrostatic interaction of electrons with a central potential of the nucleus and electron charge distribution. From the review of the earlier work, [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] it can be inferred that most of the scattering measurements were done using the photon beams either in direct or secondary excitation mode obtained from radioactive sources, namely, 60 Co, 109 Cd, 137 Cs, 147 Cs, 203 Hg, and 241 Am radioisotopes. Some of the measurements on elastic scattering cross sections were performed using photon flux obtained from X-ray of tube [29][30][31][32] and lack the corrections related to incident photon intensity and other geometrical factors.…”

“…Precise scattering measurements across the periodic table are required to explore the angular dependence of ASFs. The elastic scattering measurement FIGURE 2 Typical recorded spectra of Sn K X-rays scattered from the (a) 80 Hg, (b) 42 Mo, and (c) 14 Si targets. The spectrum recorded using the 5 B target and the background spectrum without placing any target are also shown in (c).…”