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Electromagnetic observables of open-shell nuclei from coupled-cluster theory...

by Francesca Bonaiti, Sonia Bacca, Gaute Hagen, Gustav R Jansen
Publication Type
Journal
Journal Name
Physical Review C
Publication Date
Page Number
044306
Volume
110
Issue
4

We develop a new method to describe electromagnetic observables of open-shell nuclei with two nucleons outside a closed shell.
This approach combines the equation-of-motion coupled-cluster method for such systems and the Lorentz integral transform technique, expanding the applicability of coupled-cluster theory for these properties beyond closed-shell nuclei. To validate this new approach, we compute the non-energy-weighted dipole sum rule and the dipole polarizability of $^{16,24}$O in both the single-reference coupled-cluster methods for closed-shell nuclei and the new equation-of-motion frameworks, finding agreement within error bars. We then analyze the evolution of the dipole polarizability along the oxygen and calcium isotopic chains. Our predictions agree well with available experimental data and other available theoretical calculations for the closed-shell $^{16,22}$O and the open-shell $^{18}$O. In the calcium isotopes, we observe that our dipole polarizability predictions for open-shell nuclei are lower than those of closed-shell nuclei. Our predictions for $^{24}$O and $^{54,56}$Ca will motivate future experimental studies at the dripline.