Abstract
The energy spectrum of photoneutrons from bismuth irradiated with 31 MeV bremsstrahlung is studied at ϑ angles of 30°, 60°, 90°, 120° and 150°, by means of nuclear emulsion. A comparison between the experimental energy spectra and an evaporative spectrum calculated according the expressionF(En)=kEnexp[−En/T], shows a surprisingly high contribution of high energy neutrons around ϑ=90°. The angular distribution is isotropic in the region (2 5 MeV. The contribution of the photoneutrons arising from the Bi(γ, 2n) process is evaluated.
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