Closed-shell properties of ${}^{24}$O with {\em ab initio} coupled-cluster theory

Abstract

We present an \emph{ab initio} calculation of spectroscopic factors for neutron and proton removal from ${}^{24}$O using the coupled-cluster method and a state-of-the-art chiral nucleon-nucleon interaction at next-to-next-to-next-to-leading order. In order to account for the coupling to the scattering continuum we use a Berggren single-particle basis that treats bound, resonant, and continuum states on an equal footing. We report neutron removal spectroscopic factors for the ${}^{23}$O states $J^{\pi }=1/2^{+}$, $5/2^{+}$, $3/2^{-}$ and $1/2^{-}$, and proton removal spectroscopic factors for the ${}^{23}$N states $1/2^{-}$ and $3/2^{-}$. Our calculations support the accumulated experimental evidence that ${}^{24}$O is a closed-shell nucleus.

Comments: 5 pages, 2 figures, 1 table