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Abstract
For the first time, the complete neutron multiplicity distribution has been measured from the photofission of $^{235}\mathrm{U}$ induced by high-energy spallation $\ensuremath{\gamma}$ rays arriving ahead of the neutron beam at the Los Alamos Neutron Science Center. The resulting average neutron multiplicity $3.80\ifmmode\pm\else\textpm\fi{}0.08$ (stat.) neutrons per photofission is in general agreement with previous measurements. In addition, unique measurements of the prompt fission energy spectrum of the neutrons from photofission and the angular correlation of two-neutron energies emitted in photofission also were made. The results are compared to calculations with the complete event fission model freya.
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