Mass yield distributions and fission modes in photofission of 238U below 20 MeVстатья
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Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.
Аннотация:Photon activation technique is used to obtain photofission mass distributions of U238 after irradiation in a bremsstrahlung beam with end-point energies 19.5, 29.1, 48.3, and 67.7 MeV. The weights of the symmetric (SL) and asymmetric (STI and STII) modes in the mass distributions of photofission of U238 and neutron-induced fission of 235,238U at the average excitation energies of up to 20 MeV are calculated on the basis of the obtained results and other available data. The weight of the SL mode increases by about an order of magnitude as the average excitation energy increases from 8.5 to 17 MeV, while the weight of the STI mode decreases by two times, and the weight of the STII mode slightly increases. It is shown that the peak-to-valley ratios in photofission of U238 and neutron-induced fission of U235 are very close across almost the whole studied energy range. A similar conclusion is made concerning the behavior of asymmetric and symmetric fission modes in photofission of U238 and neutron-induced fission of U235 and U238.