Decay of Nuclear Systems with A~110-260 and Related Stability Aspects

Abstract

The present thesis aims to analyze the structural profiles of different nuclear systems in the mass region A∼110−260. For A∼110−204 nuclei, the excited state decays are analyzed, whereas in the mass region A∼221−260, ground state decays are examined. In the former case, role of shell correction and pairing energies are studied for the compound systems 118Xe∗, 128Ce∗, 146Sm∗, 172Yb∗, and 196Pt∗ in view of nuclear stability and associated properties. This study is extended to other compound systems formed in the Pb region, where a comparative analysis is made among the decay patterns of 200Pb∗,202Pb∗,203Pb∗ and 204Pb∗, fused via loosely bound and tightly bound projectiles. Considering the ground state decays, processes like cluster radioactivity (CR) and spontaneous fission (SF) are explored. For cluster radioactivity, parent nuclei belonging to pre-actinide and actinide region i.e. 221Fr to 252Cf are investigated. This study has been done in view of different mass tables where different sets of binding energies and deformation parameters are made available. Using the appropriate mass table, the half-lives of probable cluster emissions are explored in Lead region and its vicinity. Whereas for spontaneous fission, different isotopes of Californium nuclei ranging from 237Cf to 256Cf are examined in light of hydrodynamical masses. These objectives are met using the collective clusterization method (CCM) based on well known Quantum Mechanical Fragmentation Theory (QMFT). For investigating the decay from ground state as well as excited state nuclei, the models namely Preformed Cluster Model (PCM) and Dynamical Cluster-decay Model (DCM) are applied respectively.