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- W2013085013 abstract "The photoneutrons ejected from a small lead target by 23-Mev bremsstrahlung x-rays from a betatron have been observed by means of recoil protons in nuclear emulsions. The angular distribution of the more energetic photoneutrons was nearly isotropic. The yield, in units of ${10}^{7}$ neutrons per mole-roentgen, was 1.4ifmmodepmelsetextpmfi{}0.2. The observed energy distribution had its maximum near 1.75 Mev. A yield curve for photoneutrons was obtained using neutron counters in paraffin. A cross-section curve was derived from the yield curve with a normalization based on the nuclear-emulsion data. The calculated energy distribution which gave a satisfactory fit to the observed photoneutrons consisted of 90% evaporation from a compound nucleus and 10% emission by the resonance direct effect. In calculating the contribution of evaporated neutrons a nuclear temperature for the residual nucleus of 1.35 Mev was used, and the factors for transmission of $l=0$ neutrons through a centrifugal barrier were applied." @default.
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- W2013085013 date "1957-10-01" @default.
- W2013085013 modified "2023-09-26" @default.
- W2013085013 title "Photoneutrons from Lead" @default.
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- W2013085013 doi "https://doi.org/10.1103/physrev.108.77" @default.
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