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- W2066727315 abstract "Differential cross sections for the elastic scattering of $1.115text{ensuremath{-}}mathrm{MeV}$ photons from tungsten $(Z=74)$ and lead $(Z=82)$ have been measured at angles ranging from 30ifmmode^circelsetextdegreefi{} to 135ifmmode^circelsetextdegreefi{}, using a high purity coaxial germanium detector. The experimental results are compared with $S$-matrix theoretical calculations of Rayleigh scattering cross sections, which also include contributions arising from the nuclear Thomson amplitudes and the Delbruck amplitude in lowest order Born approximation. The present experimental data at $1.115phantom{rule{0.3em}{0ex}}mathrm{MeV}$ indicates that Delbruck amplitudes calculated with lowest-order Born approximation, when combined with $S$-matrix Rayleigh scattering amplitudes, are sufficient, as has previously been observed at $1.332phantom{rule{0.3em}{0ex}}mathrm{MeV}$ for a number of high-$Z$ elements, and at $1.121phantom{rule{0.3em}{0ex}}mathrm{MeV}$ and $1.173phantom{rule{0.3em}{0ex}}mathrm{MeV}$ for $Z=92$. This result for $Z=74$ and $Z=82$ at $1.115phantom{rule{0.3em}{0ex}}mathrm{MeV}$ provides further confirmation that the Delbruck amplitudes calculated with lowest-order Born approximation are sufficient for energies at and below $1.332phantom{rule{0.3em}{0ex}}mathrm{MeV}$, in contrast to the situation at $2.754phantom{rule{0.3em}{0ex}}mathrm{MeV}$ where Coulomb corrections to the Delbruck amplitudes are significant for high-$Z$ elements." @default.
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- W2066727315 date "2005-03-31" @default.
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- W2066727315 title "Delbrück contribution in the elastic scattering of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mn>1.115</mml:mn><mml:mtext>−</mml:mtext><mml:mi>MeV</mml:mi></mml:mrow></mml:math>photons" @default.
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- W2066727315 doi "https://doi.org/10.1103/physreva.71.032724" @default.
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