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

Abstract

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 closed-shell and the new equation-of-motion coupled-cluster 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.

18 pages, 7 figures, matches published version on Physical Review C

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• Electric dipole polarizability constraints on neutron skin and symmetry energy
• Non-Hermitian Quantum Mechanics Approach for Extracting and Emulating Continuum Physics Based on Bound-State-Like Calculations
• Computing nuclear response functions with time-dependent coupled-cluster theory
• Non-Hermitian quantum mechanics approach for extracting and emulating continuum physics based on bound-state-like calculations: Detailed description
• Ab initio calculations of monopole sum rules: From finite nuclei to infinite nuclear matter
• From closed shells to open shells: Coupled-cluster calculations of atomic nuclei
• Ab initio calculations of nuclear charge radii across and beyond ${}^{132}$Sn: Putting chiral EFT nuclear interactions to the test
• Electromagnetic sum rules for 22O from coupled-cluster theory