Photo-Fission of Uranium and Thorium

Characterization of photoneutron fluxes emitted by electron accelerators in the 4–20 MeV range using Monte Carlo codes: A critical review

“…isotopes of uranium and plutonium, GDR may lead to photon-induced fission of the nuclei (photofission), a reaction which was already predicted by N. Bohr and J. A. Wheeler in 1939 [43] and observed experimentally in the Westinghouse Research Laboratories in 1940 [44]. Years later [45], it was known that the GDR cross-section is characterized by a in MeV (primary x-axis) or its reduced wavelength in fm (secondary x-axis) [41].…”

Evaluation of delayed neutron yields and time spectra from photofission of 238U induced by Bremsstrahlung photons below 9 MeV

“…As a first approach, the relative delayed neutron yields 𝑎 𝑖 and the decay constants 𝜆 𝑖 for 238 U were taken from Nikotin et al [2] and the maximum counting time 𝑇 max was set at 300 s. Fig. 3 presents the results obtained.…”

“…The reaction in which the fission of an atomic nucleus is induced by a high-energy photon is known as photofission [1,2]. Both fissile actinides ( 235 U, 239 Pu, etc.)…”

Fission of heavy nuclei

“…Хэксби, Уэллс и др. [8], получая нейтроны в реакции Li 7 (p, n), нашли, что граница деления то-рия лежит при 1,1 МэВ. Таким образом, из сопостав-ления этих результатов следует, что граничные энергии нейтронов в рассматриваемых случаях оди-наковы.…”