Calculations of atomic polarizability for beryllium using MCDHF method

Based on the fully relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) method and the corresponding program package GRASP2018, a new program for calculating the polarizabilities is developed. As the first application, the static electric-dipole polarizabilities of the ground state 2s^{2 1}S₀ and excited state 2s2p ³P₀ of beryllium are calculated. By means of these polarizabilities, the blackbody radiation (BBR) shift of the 2s2p ^3P_0 \to \rm 2s^2 ¹S₀ clock transition is determined. The present results agree very well with other available theoretical results.