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Quenching of spectroscopic factors for proton removal in oxygen isotopes
Authors:Jensen Ø  Hagen G  Hjorth-Jensen M  Brown B Alex  Gade A
Affiliation:Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway.
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.
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