Abstract
Different techniques for calculating effective operators within the framework of the shell model using the same effective interaction and the same excitation spaces are presented. Starting with the large-basis no-core approach, we compare the time-honored perturbation-expansion approach and a model-space truncation approach. Results for the electric quadrupole and magnetic dipole operators are presented for . The convergence trends and dependence of the effective operators on differing excitation spaces and Pauli -operators are studied. In addition, the dependence of the electric-quadrupole effective charge on the harmonic-oscillator frequency and the mass number, for , is investigated in the model-space truncation approach.
- Received 1 October 1997
DOI:https://doi.org/10.1103/PhysRevC.57.3108
©1998 American Physical Society