Gudveen Sawhney

ENTRANCE CHANNEL INDEPENDENCE IN THE DECAY OF 215Fr* NUCLEUS

The fusion-fission excitation functions for the decay of compound nucleus 215Fr*, formed in 11B+204Pb and 18O+197Au reaction channels, are studied on the Dynamical Cluster-decay Model (DCM), showing entrance channel independence, in agreement with experiments, not invoking any quasi-fission (qf) process in either of the two channels.

Sticking versus non-sticking moment of inertia: Application to the 9Be+232Th reaction

The aim of present study is to investigate the relative importance of sticking and non sticking limits of moment of inertia in the decay of 241Pu* formed in 9Be+232Th reaction. The effects of nuclear deformations and orientations are duly incorporated and investigated for both static and dynamic choices in reference to decay path of 241Pu* nucleus. The decay barrier height (VB) increases as a function of angular momentum and is shown to get strongly influenced with the choice of IS or INS limits of moment of inertia. We find that VB decreases and hence the decay probability increases, with the inclusion of sticking moment of inertia. The exclusive role of deformations, orientations, and angular momentum dependence is also addressed in reference to centrifugal potential for the use of sticking and non-sticking limits of moment of inertia.

Neutron-halo structure of light nuclei studied with effects of deformations and orientations included

Based on the cluster-core model, the effects of nuclear deformations and orientations on the halo structure of the observed and proposed cases of neutronhalo nuclei is analyzed. The calculations are performed for the deformed structures using quadrupole (β2) deformations with ‘optimum’ orientations as well as including higher multipole deformations (β2-β4) with the ‘compact’ (hot) orientations. The interesting result is that, although potential energy surfaces are modified with the inclusion of deformation effects up to β2 ,b ut the 1n- and 2n-halo nature remains intact for almost all cases investigated here, except for 17 B and 22 C nuclei. However, in some cases ( 22 O, 26 F, 27 F), the choice of higher multipole deformations up to hexadecapole is shown to be rather sensitive. In addition, the relevance of the use of different nuclear proximity potentials is also explored in the context of the halo nature of neutron-rich light nuclei. The possible role of Q-value and angular momentum effects are also addressed.