Validity of the Generalized Density Matrix Method for Microscopic   Calculation of Collective/Bosonic Hamiltonian
  Recently a procedure by generalized density matrix (GDM) is proposed for calculating a collective/bosonic Hamiltonian microscopically from the shell-model Hamiltonian. In this work we examine the validity of the method by comparing the GDM results with that of the exact shell-model diagonalization in a number of models. It is shown that the GDM method reproduces the low-lying collective states quite well, both for energies and transition rates, across the whole region going from vibrational to gamma-unstable and deformed nuclei. 
L. Y. Jia, and V. G. Zelevinsky
nucl-th cond-mat.mes-hall