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We describe low-lying collective excitations of atomic nuclei with themulti-reference covariant density functional theory, and combine them withcoupled-channels calculations for heavy-ion fusion reactions at energies aroundthe Coulomb barrier. To this end, we use the calculated transition strengthsamong several collective states as inputs to the coupled-channels calculations.This approach provides a natural way to describe anharmonic multi-phononexcitations as well as a deviation of rotational excitations from a simplerigid rotor. We apply this method to subbarrier fusion reactions of$^{58}$Ni+$^{58}$Ni, $^{58}$Ni+$^{60}$Ni and $^{40}$Ca+$^{58}$Ni systems. Wefind that the effect of anharmonicity tends to smear the fusion barrierdistributions, better reproducing the experimental data compared to thecalculations in the harmonic oscillator limit.

Semi-microscopic modeling of heavy-ion fusion reactions with multi-reference covariant density functional theory