The electric dipole polarizability quantifies the low-energy behavior of the dipole strength and is related to critical observables such as the radii of the proton and neutron distributions. Its computation is challenging because most of the dipole strength lies in the scattering continuum. In this paper we combine integral transforms with the coupled-cluster method and compute the dipole polarizability using bound-state techniques. Employing different interactions from chiral effective field theory, we confirm the strong correlation between the dipole polarizability and the charge radius, and study its dependence on three-nucleon forces. We find good agreement with data for the He4,Ca40, and O16 nuclei, and predict the dipole polarizability for the rare nucleus O22.
Bibliographical noteFunding Information:
TRIUMF receives federal funding via a contribution agreement with the National Research Council of Canada. This work was supported in parts by the Natural Sciences and Engineering Research Council (Grant No. SAPIN-2015-00031), the US-Israel Binational Science Foundation (Grant No. 2012212), the Pazy Foundation, the MIUR Grant No. PRIN-2009TWL3MX, the Office of Nuclear Physics, U.S. Department of Energy, under Grants No. DE-FG02-96ER40963 (University of Tennessee) and No. DE-SC0008499 (NUCLEI SciDAC Collaboration), and the Field Work Proposal ERKBP57 at Oak Ridge National Laboratory. Computer time was provided by the Innovative and Novel Computational Impact on Theory and Experiment (INCITE) program. This research used resources of the Oak Ridge Leadership Computing Facility located in the Oak Ridge National Laboratory, supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725, and computational resources of the National Center for Computational Sciences, the National Institute for Computational Sciences, and TRIUMF.
© 2016 American Physical Society.