Eur. Phys. J. A (2005) 25: 485-488
https://doi.org/10.1140/epjad/i2005-06-062-8

ENAM 2004

Ab initio coupled cluster calculations for nuclei using methods of quantum chemistry

¹ Department of Chemistry, Michigan State University, 48824, East Lansing, MI, USA
² Physics Division, Oak Ridge National Laboratory, P.O. Box 2008, 37831, Oak Ridge, TN, USA
³ Department of Physics and Astronomy, University of Tennessee, 37996, Knoxville, TN, USA
⁴ Center of Mathematics for Applications, University of Oslo, N-0316, Oslo, Norway
⁵ Department of Physics and Astronomy, Michigan State University, 48824, East Lansing, MI, USA
⁶ Department of Physics, University of Oslo, N-0316, Oslo, Norway

^* e-mail: piecuch@cem.msu.edu.

Received: 13 January 2005
Accepted: 18 February 2005
Published online: 13 May 2005

Abstract

We report preliminary large scale ab initio calculations of ground and excited states of ¹⁶O using quantum chemistry inspired coupled cluster methods and realistic two-body interactions. By using the renormalized Hamiltonians obtained with a no-core G-matrix approach, we obtain the virtually converged results at the level of two-body interactions. Due to the polynomial scaling with the system size that characterizes coupled cluster methods, we can probe large model spaces with up to seven major oscillator shells, for which standard non-truncated shell-model calculations are not possible.