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- W2038926346 abstract "A formula for the incoherent-scattering function using either the correlated or the uncorrelated wave-function model of atomic helium is presented. With this the total triplet-production cross section is calculated, and thus the total pair-production cross section is evaluated (triplet+coherent pair). The pair-production length of helium is calculated to be 963.64ifmmodepmelsetextpmfi{}1.5 cm for saturated liquid helium at 4.2ifmmode^circelsetextdegreefi{}K. The pair-production length is defined as ${l}_{mathrm{He}}=frac{A}{{N}_{0}{ensuremath{sigma}}_{mathrm{He}}{ensuremath{rho}}_{mathrm{He}}}$. The systematic uncertainty of about ifmmodepmelsetextpmfi{}0.15% comes from the choice of screening functions. This is a factor of 10 more accurate than the known pair-production lengths of any other element. It is suggested that this increased accuracy for the pair-production length of helium may find application as a standard in experimental measurements of absolute cross sections for high-photon-energy induced reactions." @default.
- W2038926346 created "2016-06-24" @default.
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- W2038926346 date "1968-07-25" @default.
- W2038926346 modified "2023-09-26" @default.
- W2038926346 title "Incoherent-Scattering Function, Total Pair-Production Cross Section, and Pair-Production Length for Helium" @default.
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- W2038926346 doi "https://doi.org/10.1103/physrev.171.1643" @default.
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