A FOCK-SPACE COUPLED-CLUSTER METHOD FULLY UTILIZING VALENCE UNIVERSALSTRATEGY

An alternative formulation of the Fock-space coupled-cluster method us ing the hole-particle model spaces that fully exploits valence univers al hierarchy of solving the coupled-cluster equations is presented. Fo rmalism employs similarity transformations to separate eigenvalue prob lems for valence sectors with different numbers of quasiparticles but the same number of particles and that leads to certain simplifications in comparison with the previous formulations. These simplifications a ppear in the higher sectors that recently have been a subject of growi ng interest. The linked-cluster theorem is proven for the method. (C) 1995 American Institute of Physics.