Structure evolution Yb isotopes using microscopic framework

The medium to heavy mass ytterbium nuclei with atomic number Z=70 are situated in the rare earth region. These nuclei are known to be well deformed and their energy spectra can be populated up to high spins. With 70 protons, Yb isotopes lie far away from the proton shell closures and exhibit rotational properties in their ground-state bands. However, experimental information for the heavier Yb isotopes, even for their ground-state bands, is very limited pronouncing an existing gap of knowledge for the "east" part of the isotopic nuclear chart. This region of Segre chart has recently attracted lots of attention, both experimentally as well as theoretically. The even–even Yb isotopes are considered as good candidates for extensive investigation of their rotational properties through calculations of various structural observables by making use of various well-established theoretical models. Some of the previous studies have shown the presence of Triaxiality in these Yb isotopes which is an active research topic in the field of nuclear structure. The present research work is focussed on the nuclear structure elucidation of isotopic chain of Yb isotopes with mass number ranging from 160 to 178 and to have a thorough study of non-axial shapes as well as the high spin band spectra of these nuclei. For the study of these even-even Yb isotopes, microscopic framework of triaxial projected shell model (TPSM) has been used. This model has proved to be quite successful in the recent years to elucidate the structure of nuclei with axial asymmetry belonging to different mass regions. With the application of TPSM, the high spin band spectra of all the isotopes under consideration have been calculated and an excellent degree of agreement has been achieved. Also, the model has been able to predict the energy values of yrast and near yrast bands up to the spin where the experimental data was scarce