Antibaryon-nucleus bound states

Abstract

We calculated antibaryon ($\bar{B}$ = $\bar{p}$, $\bar{\Lambda}$, $\bar{\Sigma}$, $\bar{\Xi}$) bound states in selected nuclei within the relativistic mean-field (RMF) model. The G-parity motivated $\bar{B}$-meson coupling constants were scaled to yield corresponding potentials consistent with available experimental data. Large polarization of the nuclear core caused by $\bar{B}$ was confirmed. The $\bar{p}$ annihilation in the nuclear medium was incorporated by including a phenomenological imaginary part of the optical potential. The calculations using a complex $\bar{p}$-nucleus potential were performed fully self-consistently. The $\bar{p}$ widths significantly decrease when the phase space reduction is considered for $\bar{p}$ annihilation products, but they still remain sizeable for potentials consistent with $\bar{p}$-atom data.