Shape coexistence and beta-decay properties of even-even ²⁰⁻³⁰Ne isotopes

Abstract:

The nuclear ground-state and β-decay properties of even-even ²⁰⁻³⁰Ne isotopes were investigated using the Relativistic Mean Field (RMF) model and the proton-neutron Quasiparticle Random Phase Approximation (pn-QRPA). The RMF framework, employing the DDPC1 and DDME2 interactions, was used to compute the potential energy surfaces, neutron separation energies (S_n, S_2n), nuclear ground-state deformation parameters (β₂), neutron and proton radii (R_n, R_p), charge radii (R_c), and neutron skin thickness (R_np). The pn-QRPA utilised β₂ values obtained from the RMF calculations as input parameters to compute β-decay properties, including Gamow-Teller strength distributions, log ft values, half-lives, and weak interaction rates in stellar environment for the even- even ²⁰⁻³⁰Ne isotopes. The calculated log ft values showed good agreement with the available experimental data. Furthermore, the predicted β-decay half-lives were found to be consistent with the measured values. To achieve a deeper understanding of nucleosynthesis processes in Novae environments, stellar weak interaction rates were also investigated and analysed.