Eur. Phys. J. A 11, 263-270 (2001)

Application of the Dyson boson expansion method to the treatment of the pairing force

O. Civitarese, F. Montani and M. Reboiro

Department of Physics, University of La Plata, c.c. 67 (1900), La Plata, Argentina

civitare@venus.fisica.unlp.edu.ar

(Received: 10 April 2000 / Revised version: 27 March 2001 Communicated by P. Schuck)

Abstract
The treatment of the separable pairing interaction in the context of the BRST formalism and in the Dyson boson expansion method is discussed. The approach is based on the use of the vacuum expectation value of the boson number operator to define a suitable mean field.

PACS
21.60.-n - Nuclear-structure models and methods.
21.60.Jz - Hartree-Fock and random-phase approximations.
21.60.Ev - Collective models.

© Società Italiana di Fisica, Springer-Verlag 2001