Ab-initio approach to effective single-particle energies in doubly closed shell nuclei

摘要: The present work discusses, from an ab initio standpoint, the definition, meaning, and usefulness of effective single-particle energies (ESPEs) in doubly closed shell nuclei. We perform coupled-cluster calculations to quantify what extent selected closed-shell nuclei oxygen calcium isotopic chains can effectively be mapped onto independent-particle picture. To do so, we revisit detail notion ESPEs context strongly correlated many-nucleon systems illustrate necessity extracting through diagonalization centroid matrix, as originally argued by Baranger. For purpose illustration, analyze impact correlations on observable one-nucleon separation nonobservable isotopes. then state nonobservability ESPEs. Similarly spectroscopic factors, indeed modified a redefinition inaccessible quantities while leaving actual observables unchanged. This leads absolute employing consistent structure reaction models based same nuclear Hamiltonian extract meaningful fashion experimental data.