Fragment yield in the fission of U233 and Pu239 by fast neutrons

Mass distribution in the bremsstrahlung-induced fission of 232Th, 238U and 240Pu

“…In the electromagnetic fission of lighter actinides [52][53][54], higher yields of fission products around mass numbers 133-135 corresponding to a most probable charge of 52 have been observed. Similarly, higher yields of fission products around mass numbers 133-135 in the 3 and 14 MeV mono-energetic neutron-induced [28][29][30][31][32][33][34] and in the 9, 15 and 31 MeV bremsstrahlunginduced [59] fission of 232 Th have also been observed earlier. However, in the 6.44-13.13 MeV bremsstrahlung-induced fission of 232 Th [60], yields of fission products are more pronounced around mass numbers 143-145 compared to mass numbers 133-135, which is contradictory to the earlier observations [23][24][25][26][27]59].…”

“…In the case of 240 Pu, there is no experimental data on fission yields based on radiochemical or off-line γ -ray spectrometric techniques, except the present data in the 10 MeV bremsstrahlung-induced fission. In view of this for the fissioning system 240 Pu * , the yields of fission products as a function of their mass number at different excitation energies in 10 MeV bremsstrahlung-induced fission of 240 Pu from present work and in the thermal [10], 6.1 MeV [51] and 14.8 MeV [33][34][35] neutron-induced fission of 239 Pu are plotted in Fig. 8.…”

“…However, most of the fission yield data available in the literature are for the thermal neutron- [10][11][12][13] or reactor neutron-induced [14][15][16][17][18][19][20][21][22] fission of actinides. For mono-energetic neutron-induced fission, most of the data available are for actinides induced by either 3 or 14 MeV neutrons [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37]. Some of the data on various mono-energetic neutron-induced fissions of actinides are available for specific nuclides such as 232 Th [38][39][40][41][42], 233,235,238 U [43][44][45][46][47][48], 237 Np [49,50] and 239 Pu [33,51].…”

Mass distribution in the 50-, 60-, and 70-MeV bremsstrahlung-induced fission of232Th

“…However, the yield of fission products around mass numbers 133-134 is more pronounced compared to that at mass numbers 143-144, in both neutron- [23][24][25][26][27][28][29][30][31][32] and bremsstrahlung-induced fissions of uranium isotopes and heavier actinides. We also observed higher yields of fission products around mass numbers 133-134, which corresponds to a most probable charge of 52 in the electromagnetic fission of lighter actinides [44][45][46].…”

“…However, most of the fissionyield data available in the literature are for the thermal neutron- [4][5][6][7] or the reactor neutron-induced [8][9][10][11][12][13][14][15][16] fission * gnkim@knu.ac.kr of actinides. For monoenergetic neutron-induced fission, most of the data available are for actinides induced by either 3-or 14-MeV neutrons [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Some of the data on various monoenergetic neutron-induced fissions of actinides are available for specific nuclides, such as 232 Th [33][34][35], 233,235,238 U [36][37][38][39][40], 237 Np [41,42], and 239 Pu [28,43].…”