Fine structure of charge-exchange spin-dipole excitations in $^{16}$O

TL;DR

This study uses a self-consistent covariant density functional theory to accurately reproduce and analyze the fine structure of charge-exchange spin-dipole excitations in oxygen-16, providing insights into meson field contributions.

Contribution

It presents a fully self-consistent RPA approach based on covariant density functional theory that accurately models SD excitations in $^{16}$O without parameter adjustments.

Findings

Reproduces experimental SD excitation fine structure in $^{16}$O.

Identifies the role of $\sigma$- and $\omega$-meson fields in SD excitations.

Predicts SD excitation features for the $^{16}$O($n,p$)$^{16}$N channel.

Abstract

The charge-exchange spin-dipole (SD) excitations for both $(p,n)$ and $(n,p)$ channels in $^{16}$O are investigated in the fully self-consistent random phase approximation based on the covariant density functional theory. The fine structure of SD excitations in the most up-to-date $^{16}$O($\vec p, \vec n$)$^{16}$F experiment is excellently reproduced without any readjustment in the functional. The characteristics of SD excitations are understood with the delicate balance between the $\sigma$- and $\omega$-meson fields via the exchange terms. The fine structure of SD excitations for $^{16}$O($n,p$)$^{16}$N channel is predicted for future experiments.