Pushpendra P. Singh

Observation of incomplete fusion reactions at l < l crit

In order to understand the presence of incomplete fusion at low energies i.e. 4-7MeV/nucleon & also to study its dependence on various entrance-channel parameters, the two type of measurements (i) excitation function for 12C+159Tb, and (ii) forward recoil ranges for 12C+159Tb systems have been performed. The experimentally measured excitation functions have been analyzed within the framework of compound nucleus decay using statistical model code PACE4. Analysis of data suggests the production of xn/px)n-channels via complete fusion, as these are found to be well reproduced by PACE4 predictions, while, a significant enhancement in the excitation functions of α-emitting channels has been observed over the theoretical ones, which has been attributed due to the incomplete fusion processes. Further, the incomplete fusion events observed in case of forward recoil range measurements have been explained on the basis of the breakup fusion model, where these events may be attributed to the fusion of 8Be and/or 4He ...

Low energy in-complete fusion: The α-Q-value systematics

In the present work, the in-complete fusion probability has been deduced for 12C+159Tb and 13C+159Tb systems in the energy range ≈ 4-7 MeV/nucleon. The activation technique followed by off-line γ-rays spectroscopy has been used. The results have been compared with the predictions of statistical model code PACE4, which is based on the compound nucleus decay. The ratio of the sum of cross-sections of all measured xn, pxn channels to their corresponding PACE4 predictions are found to be lying close to unity throughout the studied energy range for both the systems, indicating their population via fusion evaporation channels followed by CF processes only. However, the ratio of the sum of cross-sections of all experimentally measured xn, pxn and αxn-channels to their corresponding PACE4 calculations, display significant enhancement over the unity line, indicating the onset and presence of in-complete fusion processes at these energies. The comparison of experimentally measured and systematically deduced in-comp...