Toward open-shell nuclei with coupled-cluster theory

G. R. Jansen, M. Hjorth-Jensen, G. Hagen, and T. Papenbrock
Phys. Rev. C 83, 054306 – Published 12 May 2011

Abstract

We develop a method based on equation-of-motion coupled-cluster theory to describe properties of open-shell nuclei with A±2 nucleons outside a closed shell. We perform proof-of-principle calculations for the ground states of the helium isotopes He36 and the first excited 2+ state in He6. The comparison with exact results from matrix diagonalization in small model spaces demonstrates the accuracy of the coupled-cluster methods. Three-particle–one-hole excitations of He4 play an important role for the accurate description of He6. For the open-shell nucleus He6, the computational cost of the method is comparable with the coupled-cluster singles-and-doubles approximation while its accuracy is similar to the coupled-cluster with singles, doubles, and triples excitations.

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  • Received 8 February 2011

DOI:https://doi.org/10.1103/PhysRevC.83.054306

©2011 American Physical Society

Authors & Affiliations

G. R. Jansen1, M. Hjorth-Jensen1, G. Hagen2,3, and T. Papenbrock2,3,4,5

  • 1Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway
  • 2Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 3Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
  • 5Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany

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Issue

Vol. 83, Iss. 5 — May 2011

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