α-accompanied cold ternary fission ofPu238–244isotopes in equatorial and collinear configuration

Abstract

The cold ternary fission of 238 Pu, 240 Pu, 242 Pu and 244 Pu isotopes, with 4 He as light charged particle, in equatorial and collinear configuration has been studied within the Unified ternary fission model (UTFM). The fragment combination 100 Zr+ 4 He+ 134 Te possessing the near doubly magic nuclei 134 Te (N=82, Z=52) gives the highest yield in the alpha accompanied ternary fission of 238 Pu. For the alpha accompanied ternary fission of 240 Pu, 242 Pu and 244 Pu isotopes, the highest yield was found for the fragment combination with doubly magic nuclei 132 Sn (N=82, Z=50) as the heavier fragment. The deformation and orientation of fragments have also been taken into account for the alpha accompanied ternary fission of [238][239][240][241][242][243][244] Pu isotopes, and it has been found that in addition to closed shell effect, ground state deformation also plays an important role in determining the isotopic yield in the ternary fission process. The emission probability and kinetic energy of long range alpha particles have been calculated and are found to be in good agreement with the experimental data.

Ternary fission of 250,252Cf isotopes with 3H and 6He as light charged particle

“…The relative yield is calculated and plotted as a function of fragment mass numbers A 1 and A 2 as shown in figure 3(d). From the plot, the highest relative yield is found for the fragment combination 114 Pd+ 6 He+ 132 Sn, which is the same fragment combination with high Q value and also possess the presence of doubly magic …”

“…The next minimum found for the fragment combination around 114 Pd+ 6 He+ 132 Sn is due to the presence of doubly magic nucleus 132 Sn (N=82, Z=50). The relative yield is calculated and plotted as a function of fragment mass numbers A 1 and A 2 as shown in figure 3(d).…”

“…The same fragment combination possesses the highest Q value and hence may be the most suitable fragment splitting in this ternary fission process. The relative yield is calculated for all possible fragmentations and plotted as a function of fragment mass numbers A 1 and A 2 as shown in figure 3(c) In the 6 He accompanied ternary fission of 252 Cf isotope, the driving potential is calculated for all possible fragmentations and plotted as a function of fragment mass number A 1 as shown in figure 2(d). Here the deepest minimum is found for the fragment combination 4 He+ 6 He+ 242…”

“…The barrier penetrability and hence the relative yield is calculated for each fragment combination found in the cold reaction valley plot. Figure 3(a) Cf isotope with 6 He as light charged particle, the driving potential is calculated for all possible fragmentations and potted as a function of fragment mass number A 1 as shown in figure 2(c) Te, which includes the presence of near doubly magic nucleus 134 Te (N=82, Z=52). The same fragment combination possesses the highest Q value and hence may be the most suitable fragment splitting in this ternary fission process.…”

“…A number of theoretical and experimental works have been conducted in the field of ternary fission of various isotopes. We have developed a model named as Unified ternary fission model (UTFM) [2][3][4][5][6][7], in order to find the most favourable fragment combinations in the ternary fission process of various isotopes and our model is briefly described in the following section.…”