Coupled-cluster calculations for valence systems around O16

J. R. Gour, P. Piecuch, M. Hjorth-Jensen, M. Włoch, and D. J. Dean
Phys. Rev. C 74, 024310 – Published 18 August 2006

Abstract

We study the ground and low-lying excited states of O15, O17, N15, and F17 using modern two-body nucleon-nucleon interactions and the suitably designed variants of the ab initio equation-of-motion coupled-cluster theory aimed at an accurate description of systems with valence particles and holes. A number of properties of O15, O17, N15, and F17, including ways the energies of ground and excited states of valence systems around O16 change as functions of the number of nucleons, are correctly reproduced by the equation-of-motion coupled-cluster calculations performed in up to eight major-oscillator shells. Certain disagreements with experiment are in part because of the degrees of freedom such as three-body interactions not accounted for in our effective two-body Hamiltonians. In particular, the calculated binding energies of O15/N15 and O17/F17 enable us to rationalize the discrepancy between the experimental and recently published [Phys. Rev. Lett. 94, 212501 (2005)] equation-of-motion coupled-cluster excitation energies for the Jπ=3 state of O16. Our calculations demonstrate the feasibility of the equation-of-motion coupled-cluster methods to deal with valence systems around closed-shell nuclei and to provide results for systems beyond A=16.

  • Received 21 July 2005

DOI:https://doi.org/10.1103/PhysRevC.74.024310

©2006 American Physical Society

Authors & Affiliations

J. R. Gour1, P. Piecuch1,2, M. Hjorth-Jensen2,3,4, M. Włoch1, and D. J. Dean4,5

  • 1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics, University of Oslo, N-0316 Oslo, Norway
  • 4Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway
  • 5Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, Tennessee 37831, USA

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Issue

Vol. 74, Iss. 2 — August 2006

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