In this talk, I am going to discuss the beta-decay of nuclei in the north and south regions of ²⁰⁸Pb nucleus [1-2] using large scale shell-model calculations. The β^--decay properties, such as the log ft, average shape factor values, and half-lives are calculated for these neutron-rich nuclei using effective interactions in the ²⁰⁸Pb region. These calculations have been performed without truncation in a particular model space for nuclei (Z ≥ 82, N > 126) and (Z ≤ 82, N ≤ 126), but for core breaking nuclei (Z ≤ 82, N > 126), particle hole excitations are included. These beta decay properties are also computed using theoretical Q-values. Recently, several experiments are being performed for nuclei in this region corresponding to β^--decay and we have reported shell-model results for these transitions. An extensive comparison with the experimental data has been made, and spin parities of several states have been proposed.

[1] S. Sharma, P. C. Srivastava , A. Kumar , and T. Suzuki, Phys. Rev. C 106, 024333 (2022).

[2] S. Sharma, P. C. Srivastava , A. Kumar , T. Suzuki, C. Yuan, and N. Shimizu, Phys. Rev. C 110, 024320 (2024).