Dr. Abdul Kabir ^1* Jameel-Un Nabi ² Hamad Almujibah ³ Izzah Anwaar ¹ Noor-Ul Ain Raza ¹

• ¹ Institute of Space Technology, Islamabad, Pakistan
• ² University of Wah, Wah Cantonment, Punjab, Pakistan
• ³ Taif University, Ta'if, Saudi Arabia

The nuclear ground state properties of 63 Co and 63 Ni nuclei have been investigated within the framework of the relativistic mean field (RMF) approach. The RMF model with density-dependent meson-exchange (DD-ME2) interaction is utilized for the calculation of potential energy curves (PECs) and the nuclear ground-state deformation parameters (β 2 ) of 63 Co, and 63 Ni. The blocking effects of the unpaired nucleon are considered using the equal filling approach, for the odd-A system. Later, the β -decay properties including the stellar weak rates and GT strength of 63 Co, and 63 Ni are studied using the proton-neutron quasi particle random phase approximation (pn-QRPA) model. The β 2 values computed from the RMF model are employed in the pn-QRPA framework as an input parameter for the calculations of β -decay properties for 63 Co, and 63 Ni. The stellar rates are compared with the projected shell model (PSM) results. For all densities, the pn-QRPA rates are found to be higher than the stellar rates computed via the PSM up to a factor of 1.3 or more. The findings reported in the present investigation might be useful for simulating the late-stage stellar evolution of massive stars and s-process of nucleosynthesis.