Centro-symmetric many-body Hamiltonians investigated with number-conserving operator equivalences and rotational symmetries

The one- and two-body components of a centro symmetric Hamiltonian for a fr ee ion taken as an example are cast into useful forms utilising equivalence s based on the rotational properties of double tensor operators. Second-qua ntised number-conserving pairs may be expressed in terms of spin and orbita l operators following the work of Stevens. The final result is expressed in a useful diagonal form in spin and orbital space by equating two-body matr ix elements. (C) 1999 Elsevier Science B.V. All rights reserved.