title: Quenching of spectroscopic factors for proton removal in oxygen isotopes.
abstract: We present microscopic coupled-cluster calculations of the spectroscopic factors for proton removal from the closed-shell oxygen isotopes (14,16,22,24,28)O with a chiral nucleon-nucleon interaction at next-to-next-to-next-to-leading order. We include coupling-to-continuum degrees of freedom by using a Hartree-Fock basis built from a Woods-Saxon single-particle basis. This basis treats bound and continuum states on an equal footing. We find a significant quenching of spectroscopic factors in the neutron-rich oxygen isotopes, pointing to enhanced many-body correlations induced by strong coupling to the scattering continuum above the neutron emission thresholds.
authors.affiliation: Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway.
authors.forename: Ø
authors.initials: Ø
authors.lastname: Jensen
authors.forename: G
authors.initials: G
authors.lastname: Hagen
authors.forename: M
authors.initials: M
authors.lastname: Hjorth-Jensen
authors.forename: B Alex
authors.initials: BA
authors.lastname: Brown
authors.forename: A
authors.initials: A
authors.lastname: Gade