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- W1969349778 abstract "Abstract The time-of-flight method has been used to measure the energy spectra of neutrons emitted by targets of natural uranium, lead, bismuth and tungsten when bombarded by 45 MeV electrons from the Harwell linear accelerator. The spectra were measured at 90 to the electron beam and covered the energy range 40 keV-6 MeV. For targets 3 cascade shower radiation lengths in thickness, the mean energy of the neutrons was found to be 1·92 MeV for lead and 1·37 MeV for uranium and the relative yield from lead to that for uranium was 0·47 ± 0·05. For targets of lead, bismuth and tungsten the observed spectra could be represented over a large energy range by Maxwellian distributions at temperatures of 0·98, 0·82 and 0·44 MeV respectively. The angular distributions of the neutrons from lead and uranium targets were determined from foil activation measurements using the threshold reactions 31P(n, p)31Si, 27Al(n, p)27Mg and 27Al(n, α)24Na. For a small uranium target forward peaking of the emitted neutrons relative to the electron beam direction was observed. The development of larger targets of uranium and lead which act as isotropic neutron sources for use in reactor physics measurements is described." @default.
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- W1969349778 date "1967-09-01" @default.
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- W1969349778 title "Neutron energy spectra and angular distributions from targets bombarded by 45 mev electrons" @default.
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- W1969349778 doi "https://doi.org/10.1016/0022-3107(67)90109-8" @default.
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