Speaker
Description
Abstract
Nuclei with either protons or neutrons at closed-shell magic configuration, have only one type of active nucleons and are called semi-magic nuclei. Presence of like-nucleons in such semi-magic nuclei result in the simplicity out of complex nucleonic structure. This can be understood in terms of the symmetries of pairing Hamiltonian and seniority/ generalized seniority quantum number(s). Due to certain seniority and generalized seniority selection rules, seniority isomers exist in these nuclei where isomers refer to the excited states having longer life-times than the normal excited states [1]. For example, Sn (Z = 50) isotopes, the longest known semi-magic isotopic chain, present an interesting ground to understand the origin of seniority isomers including their decay probabilities and moments [2, 3]. But what will happen if we move to two-proton holes configuration in Cd (Z = 48) isotopes to the two-proton particles configuration in Te (Z = 52) isotopes [4]? Will the generalized seniority symmetries hold on going from Cd to Sn to Te isotopes for the seniority isomers and low-lying excitations such as the first 2+ and 3− states [5]? These questions will primarily be focused in the presentation.
Acknowledgements
BM acknowledges the financial support from the Croatian Science Foundation and the ́Ecole Polytechnique F ́ed ́erale de Lausanne, under the project TTP-2018-07-3554 “Exotic Nuclear Structure and Dynamics”, with funds of the Croatian-Swiss Research Programme.
References
[1] A. K. Jain, B. Maheshwari, A. Goel, Nuclear Isomers - A Primer, Springer Nature, Switzerland (2021).
[2] B. Maheshwari and A. K. Jain, Phys. Lett. B 753, 122 (2016).
[3] B. Maheshwari and A. K. Jain, Nucl. Phys. A 986, 232 (2019).
[4] B. Maheshwari, H. A. Kassim, N. Yusof and A. K. Jain, Nuclear Physics A 992, 121619 (2019).
[5] B. Maheshwari, European Physical Journal Special Topics 229, 2485 (2020).
