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

TL;DR

This paper combines multi-reference covariant density functional theory with coupled-channels calculations to improve the modeling of heavy-ion fusion reactions, capturing anharmonic effects and deviations from simple rotational models.

Contribution

It introduces a semi-microscopic approach that incorporates anharmonic multi-phonon excitations into fusion reaction modeling using first-principles calculated transition strengths.

Findings

Anharmonicity smears fusion barrier distributions.

The method better reproduces experimental fusion data.

Deviations from rigid rotor behavior are effectively modeled.

Abstract

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