Symmetric fission of 232Th by 14 MeV neutrons

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

“…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]. Besides this, it can be found in Ref.…”

“…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

“…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]. Similarly, higher yields of fission products around mass numbers 133-134 in the 3-and 14.8-MeV monoenergetic neutron-induced [17][18][19][20][21][22] and in the 9-, 15-, and 31-MeV bremsstrahlung-induced [51] fissions of 232 Th have been observed earlier. On the other hand, in the 6.44-13.13- [52,53] and 25-40-MeV [50] bremsstrahlung-induced fission of 232 Th, the yields of fission products are more pronounced around mass numbers 143-144 compared to those with mass numbers 133-134, which is contradictory to the earlier observations [17][18][19][20][21][22]51].…”

“…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].…”

Cumulative yields in the 14 MeV neutron fission of 232Th and 238U in the symmetric region

“…Since these studies were done with reactor neutrons (low excitation energy) and with small amounts of material, it was not possible to draw any conclusions concerning the mechanism of fission. While some mass yields in the symmetric region have been reported for 2 3 2~h and 238U with 14 MeV neutrons (15)(16)(17)(18)(19)(20)(21)(22)(23)(24), a systematic study in these systems, in which a complete range of symmetrical yields are simultaneously obtained, is somewhat lacking. In the present study the yields of selected nuclides in the mass range of 103 to 125 have been determined to establish lined with aluminum foil and wrapped with cadmium foil to absorb thermal neutrons which might be present in the target area.…”