Electromagnetic multipole responses of fissioning nuclei and their uncertainties described by the finite amplitude method

Electromagnetic multipole responses are key inputs to model the structure, decay, and reactions of atomic nuclei. With the introduction of the finite amplitude method (FAM), large-scale calculations of the nuclear linear response in heavy deformed nuclei have become possible. In this talk I will present our recent study of multipole responses in actinide nuclei with Skyrme energy density functionals. We quantify both systematic and statistical uncertainties induced by the functional parametrization in FAM calculations. We also extend the FAM formalism to perform blocking calculations with the equal filling approximation for odd-mass and odd-odd nuclei, and analyze the impact of blocking configurations. By examining the entire plutonium isotopic chain from the proton to the neutron drip line, we find a large variability of the response and show its correlation with the nuclear ground state. This work paves the way for future large-scale calculations of multipole responses over the nuclear chart, which will provide valuable nuclear-structure inputs for reaction and nucleosynthesis studies.