title: Effects of three-nucleon forces and two-body currents on Gamow-Teller strengths.
abstract: We optimize chiral interactions at next-to-next-to leading order to observables in two- and three-nucleon systems and compute Gamow-Teller transitions in 14C and (22,24)O using consistent two-body currents. We compute spectra of the daughter nuclei 14N and (22,24)F via an isospin-breaking coupled-cluster technique, with several predictions. The two-body currents reduce the Ikeda sum rule, corresponding to a quenching factor q2≈0.84-0.92 of the axial-vector coupling. The half-life of 14C depends on the energy of the first excited 1+ state, the three-nucleon force, and the two-body current.
authors.affiliation: Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway.
authors.forename: A
authors.initials: A
authors.lastname: Ekström
authors.affiliation: Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: G R
authors.initials: GR
authors.lastname: Jansen
authors.affiliation: Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Wendt
authors.affiliation: Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: G
authors.initials: G
authors.lastname: Hagen
authors.affiliation: Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.
authors.forename: T
authors.initials: T
authors.lastname: Papenbrock
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada and Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Bacca
authors.affiliation: Department of Fundamental Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Carlsson
authors.affiliation: Racah Institute of Physics, Hebrew University, 91904 Jerusalem, Israel.
authors.forename: D
authors.initials: D
authors.lastname: Gazit