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  • Letter
  • Open Access

Electric dipole polarizability of Ca40

R. W. Fearick1, P. von Neumann-Cosel2,*, S. Bacca3,4, J. Birkhan2, F. Bonaiti3, I. Brandherm2, G. Hagen5,6, H. Matsubara7,8, W. Nazarewicz9 et al.

N. Pietralla2, V. Yu. Ponomarev2, P.-G. Reinhard10, X. Roca-Maza11, A. Richter2, A. Schwenk2,12,13, J. Simonis3, and A. Tamii7

  • 1Department of Physics, University of Cape Town, Rondebosch 7700, South Africa
  • 2Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
  • 3Institut für Kernphysik and PRISMA+ Cluster of Excellence, Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
  • 4Helmholtz-Institut Mainz, Johannes Gutenberg Universität Mainz, 55099 Mainz, Germany
  • 5Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 6Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 7Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
  • 8Faculty of Radiological Technology, Fujita Health University, Aichi 470-1192, Japan
  • 9Facility for Rare Isotope Beams and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 10Institut für Theoretische Physik II, Universität Erlangen, D-91058 Erlangen, Germany
  • 11Dipartimento di Fisica, Universita‘ degli Studi di Milano, 20133 Milano, Italy and INFN, Sezione di Milano, 20133 Milano, Italy
  • 12ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 13Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany

  • *vnc@ikp.tu-darmstadt.de
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Phys. Rev. Research 5, L022044 – Published 31 May, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022044

Abstract

The electric dipole strength distribution in Ca40 between 5 and 25 MeV has been determined at RCNP, Osaka, from proton inelastic scattering experiments at very forward angles. Combined with total photoabsorption data at higher excitation energy, this enables an extraction of the electric dipole polarizability αD(40Ca)=1.92(17) fm3. Together with the measured αD in Ca48, it provides a stringent test of modern theoretical approaches, including coupled-cluster calculations with chiral effective field theory interactions and state-of-the art energy density functionals. The emerging picture is that for this medium-mass region dipole polarizabilities are well described theoretically, with important constraints for the neutron skin in Ca48 and related equation of state quantities.

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Phys. Rev. Research 5, L022044– Published 31 May, 2023
  • Received 14 February 2023
  • Accepted 9 May 2023
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