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- W1977862192 abstract "Elastic-scattering cross sections for 59.54-keV photons have been measured at an angle of 121ifmmode^circelsetextdegreefi{} for 42 elements in the atomic region $12<~Z<~92.$ The measurements were performed using a ${}^{241}mathrm{Am}$ radioisotope as the photon source and a Si (Li) detector. The measured cross sections have been compared with those based on the modified-relativistic form factors (MF's), a combination of the MF's and angle-independent ``anomalous'' scattering factors $(mathrm{M}mathrm{F}+mathrm{A}mathrm{S}mathrm{F}),$ and the relativistic second-order $S$-matrix calculations. The MF cross sections are found to be enormously higher for the elements with $K$-shell binding energy ${(E}_{K})$ close to the incident photon energy ${(E}_{mathrm{inc}})$ of 59.54 keV. The $S$ matrix and $mathrm{M}mathrm{F}+mathrm{A}mathrm{S}mathrm{F}$ cross sections, in general, represent the trend of the measured data over the whole atomic region under investigation. These theoretical cross sections are in good agreement with the measured data for the elements with $12<~Z<~26$ and, thereafter, deviate with increasing $Z.$ The $S$ matrix and $mathrm{M}mathrm{F}+mathrm{A}mathrm{S}mathrm{F}$ values are, on the average, higher by 17%, and 24%, respectively, for the elements with $39<~Z<~67;$ and by 10% and 19%, respectively, for the elements with $70<~Z<~92.$ In case of ${}_{68}mathrm{Er},$ having a $K$-shell binding energy 2.1 keV lower than the incident photon energy, the $mathrm{M}mathrm{F}+mathrm{A}mathrm{S}mathrm{F}$ value shows good agreement with the measured one, and the $S$ matrix value is lower by 12%." @default.
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- W1977862192 date "1998-06-01" @default.
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- W1977862192 title "Large-angle elastic scattering of 59.54-keV photons by elements with<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mn>12</mml:mn><mml:mo><~</mml:mo><mml:mi>Z</mml:mi><mml:mo><~</mml:mo><mml:mn>92</mml:mn></mml:math>" @default.
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- W1977862192 doi "https://doi.org/10.1103/physreva.57.4327" @default.
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