Measurements of fission yield in 8 MeV bremsstrahlung induced fission of 232Th and 238U

The investigation on fragments mass distributions for photofission of ${}^{232}{Th}$, ${}^{238}U$, ${}^{237}{Np}$ and ${}^{240}{Pu}$ isotopes by systematics methods

“…Although the end-point energy applied to calculate the mass distribution, but the (average) excitation energy must be used to calculate the P/V ratio. The calculated results of these models, similar the other literatures [23,28,32,33], decrease with increasing excitation energy. The decreasing rate is not exactly same as other works, but the trend of changing is the same.…”

“…Comparison of the calculated photofission fragments mass distribution with experimental data[32] in logarithmic scale for 238 U at 8MeV end-point bremsstrahlung energy.…”

“…The photofission fragments mass distributions of 238 U at 8 MeV endpoint energy (left) and 232 Th at 12 MeV endpoint energy (right) for β=1 and 1.17 along with experimental data. The experimental data for photofission of 238 U and 232 Th are taken from[32] and[23], respectively.…”

Fission product yield measurements using monoenergetic photon beams

“…Most of their measurements were of about 11 fission products with half-lives in the range of those in our present work. Figure 13 shows the present FPY data in comparison to FPYs obtained with bremsstrahlung beams of end-point energies between 8.0 and 25.0 MeV [17,19,20,[26][27][28][29][30]. Clearly, the bremsstrahlung-beam data do not support our large FPY results for 92,93 Y.…”

“…Kahane et al [24] measured fission yields from the photofission of 238 U with neutron capture γ rays at an effective excitation energy of 7.8 MeV. In recent years, Naik and his group [19,[26][27][28] have measured the FPY values of several products from photofission of 238 U induced by bremsstrahlung beams with end-point energies from 8.0 to 20 MeV. Most of their measurements were of about 11 fission products with half-lives in the range of those in our present work.…”