Quenching of spectroscopic factors for proton removal in oxygen isotopes

TL;DR

This paper uses microscopic coupled-cluster calculations with a chiral interaction to study proton removal spectroscopic factors in oxygen isotopes, revealing significant quenching due to continuum coupling.

Contribution

It introduces a novel approach combining coupled-cluster theory with a continuum-inclusive basis to analyze spectroscopic factors in oxygen isotopes.

Findings

Significant quenching of spectroscopic factors in neutron-rich isotopes.

Enhanced many-body correlations due to continuum coupling.

Method effectively treats bound and continuum states on equal footing.

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 the 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.