Mass Distribution of Fission Products in the 28.5 MeV Alpha Particle Induced Fission of ²³²Th

Mass and charge distribution in232Th(?, f) reaction in the projectile energy range 28 to 72 MeV

“…where D is the absolute disintegration rate corrected for y-abundances, detector efficiency and the He-jet transport efficiency, N is the effective number of target nuclei per cm z measured following methods detailed earlier [3,7], I is the beam intensity and t is the irradiation time.…”

“…The intensities for the y-rays belonging to the decay In order to obtain the mass distribution, the absolute cross-sections or the cumulative yields were determined following the procedure outlined earlier [7,3]. The cumulative yields were then converted into chain yields assuming UCD and v t as given by (1).…”

“…The chain yields for the complementary products were then determined by taking into account the total neutron multiplicity (vt). The nuclei for which the Iy values are unknown, e.g., l~176 l~ and 112Rh, the I~ values were computed so that the chain yields fit into earlier mass distribution data for the same fissioning system at 28.5 MeV [3]. The same Ir values were then used to compute the yields of these nuclei at the other three incident energies of 39.7, 50.8 and 71.4 MeV.…”

“…The dots denotes the reflected points. The data of Guin et al [3,4] are denoted by triangles. The typical error in the experimental data are around 20%.…”

Mass Distribution of Fission Products from Moderately Excited 236U Compound Nucleus

“…However, the exact dependence of the competition between Symmetrie and asymmetric fission modes on excitation energy has not been brought out in these studies. To investigate the excitation energy dependence of different fission modes we have already completed [5] the mass distribution work at 28.5 MeV ainduced fission of ^^^Th. In the present work we report the experimental data on mass distribution in the fission of ^^^Th induced by 38 MeV a-particles.…”