Department of Nuclear and Atomic Physics Seminars

Nuclear Structure Studies using Triaxial Projected Shell Model approach

by Dr. Jehangir Sheikh (NIT, Srinagar)

Monday, April 8, 2019 from to (Asia/Kolkata)
at TIFR, Mumbai ( P - 305 )
Description
 The understanding of the atomic nucleus, a complex many-fermion quantum system with short-range interaction among all constituent particles, is one of the most outstanding and challenging problem in physics to investigate theoretically. The ab-initio methods when applied to heavier systems with many active particles present insurmountable computational challenges as the configuration space explodes rapidly. Thus other models are needed in which the most important degrees of freedom are identified and retained so that a full treatment of all interactions among the active particles can be avoided. In this class of models, the projected shell model (PSM) alongwith its modified version known as Triaxial Pojected Shell Model Approach (TPSM) have been demonstrated to reproduce the properties of deformed systems with remarkable success. There are quite a number of important outstanding issues which are being widely explored in nuclear structure physics that explicitly require the breaking of axial symmetry. These include: Identification of chiral geometry in atomic nuclei, magnetic and anti-magnetic rotation, wobbling motion observed in strongly deformed nuclei and observation of γ -bands based on vacuum as well as quasiparticle configuration in transitional nuclei. The purpose of the present research proposal would be to shed light on these observations using the TPSM approach after modifying and extending it by incorporating multi-quasiparticle configurations into the model. For instance, for the odd-neutron nuclei, the present space is quite limited and include only one-neutron and two-proton quasiparticle excitations. It is highly desirable to enrich this model space by enlarging the subspace to include, at least, two-proton and three-neutron quasiparticle excitations. This will enable us to understand excitation mechanisms like magnetic and anti-magnetic rotations.