Eur. Phys. J. A (2005) 25: 489-490
https://doi.org/10.1140/epjad/i2005-06-074-4

ENAM 2004

Effective operators in the NCSM formalism

¹ Department of Physics, University of Arizona, P.O. Box 210081, 85721, Tucson, AZ, USA
² Lawrence Livermore National Laboratory, 94551, Livermore, CA, USA
³ Department of Physics and Astronomy, Iowa State University, 50011, Ames, IA, USA

^* e-mail: stetcu@physics.arizona.edu

Received: 12 November 2004
Accepted: 18 February 2005
Published online: 29 June 2005

Abstract

No-core shell model (NCSM) calculations using ab initio effective interactions are very successful in reproducing the experimental nuclear spectra. While a great deal of work has been directed toward computing effective interactions from bare nucleon-nucleon (NN) and three-nucleon forces, less progress has been made in calculating the effective operators. Thus, except for the relative kinetic energy, the proton radius, and the NN pair density, all investigations have used bare operators. We apply the Lee-Suzuki procedure to general one-body operators, investigating the importance of the approximations involved. In particular we concentrate on the limitations of the two-body cluster approximation.