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- W2044494236 abstract "A beam of 20–130 MeV positrons, with average intensities between 10 nA and 50 nA, is used at the 600 MeV Saclay Linac to create a quasi-monochromatic photon beam with a continuously variable energy. This beam was used to measure photoneutron cross sections and the corresponding photonuclear facility is first described. The computer-controlled methods, implemented to measure the energy spectrum and the emittance of the positron beam are described. The quasi-monochromatic photon lines are produced by the annihilation in flight of monoenergetic positrons in two annihilation radiators with different Z successively. The photon beam emission angle θ is shown to be the most critical parameter in the search for an optimum overall signal to background ratio for a specific photoneutron experiment. The choice of an angle θ⋍4° is explained for absolute measurements of σ(γ, xn) cross-sections, for which th used average intensities of monochromatic photons were thus purposely reduced to ⋍5 x 103s−1., with an energy resolution ⋍12%." @default.
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- W2044494236 date "1979-10-01" @default.
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- W2044494236 title "The quasi-monochromatic photon beam used in photoneutron experiments from 20–120 MeV at the 600 MeV Saclay Linac" @default.
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- W2044494236 doi "https://doi.org/10.1016/0029-554x(79)90627-x" @default.
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