Application of the preformed clusters based dynamical cluster-decay model (DCM) is made to the recent data on decay of the compound systems ${}^{118,122}\mathrm{Ba}{}^{*}$ at a relatively low bombarding energy of 5.5 MeV/$A$. The same model has been applied earlier to the intermediate mass fragment (IMF) data of ${}^{116}\mathrm{Ba}{}^{*}$, observed at medium and higher incident energies. For the heavier ${}^{118,122}\mathrm{Ba}{}^{*}$ systems, however, a complete mass fragmentation spectrum is observed experimentally. Except for a small narrow region of heavier mass fragments ($8⩽Z_L⩽15$), the DCM gives an overall reasonable description of the observed data on both the intermediate mass fragments and the fusion-fission cross-sections, whereas the statistical model calculations based on BUSCO and GEMINI codes describe the intermediate mass fragment data and the heavier mass fragment and fusion-fission data, respectively. Within the DCM (with preformation factor $P_0=1$), the possibility of non-compound-nucleus decay contributing to the region $8⩽Z_L⩽15$ of heavier mass fragments is also explored. All three models use the maximum angular momentum ${\ell }_{\max }$ as a fitting parameter, which in the DCM is fixed via a neck-length parameter for the penetrability $P\to 1$.

Close

PrevNext

View figure in article

• 
• 
•