| Description |
The nuclei near the N = 82 and Z = 82 shell closures in A ~ 130 and A ~ 190 mass regions, respectively, are crucial laboratories to observe interesting nuclear structure phenomena and to test a variety of nuclear models. In both the mass regions the high-j orbitals with different driving effects play important role to generate variety of nuclear structural phenomena, such as, magnetic rotation, chirality, shape co-existence, onset of deformation, etc. Near N = 82 shell closure, detailed investigation of the high spin states in 134Cs has been carried out. The results obtained for 134Cs in this work suggest that N =77 defines the border of triaxial deformation and chirality in odd-odd Cs isotopes. On the other hand, to study these interesting structural phenomena, high spin spectroscopy of Tl and Bi nuclei in A ~ 190 region with proton numbers just below and above the Z = 82 shell closures, were investigated, respectively. Experimental results indicate that the onset of the deformation takes place in 195Bi and many interesting structural information are obtained for other nuclei. The gamma ray spectroscopy of the above nuclei was performed in several experiments using the Indian National Gamma Array (INGA) with Clover HPGe detectors. The experimental difficulties encountered for the y-ray spectroscopic studies of the heavy nuclei will be discussed along with possible tagging devices which would improve such measurements
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