Improved basis selection for the projected configuration interaction method applied to medium-heavy nuclei

Physical Review C (Impact Factor: 3.72). 01/2009; 80. DOI:10.1103/PhysRevC.80.034325
Source: arXiv

ABSTRACT In a previous paper, we proposed a projected configuration interaction method that uses sets of axially deformed single-particle states to build up the many-body basis. We show that the choice of the basis set is essential to the efficiency of the method, and we propose a newly improved algorithm for selecting the projected basis states. We also extend our method to model spaces that can accommodate both parities and can include odd-multipole terms in the effective interaction, such as the octupole contributions. Examples of Ni56, Se68, Se70, and Se76 are calculated showing good agreement with the full configuration interaction results.

0 0
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: An effective interaction is derived for use in the full pf basis. Starting from a realistic G-matrix interaction, 195 two-body matrix elements and 4 single-particle energies are determined by fitting to 699 energy data in the mass range 47 to 66. The derived interaction successfully describes various structures of pf-shell nuclei. As examples, systematics of the energies of the first 2+ states in the Ca, Ti, Cr, Fe, and Ni isotope chains and energy levels of 56,57,58Ni are presented. The appearance of a new magic number 34 is seen.
    Physical Review C 06/2002; · 3.72 Impact Factor
  • Source
    [show abstract] [hide abstract]
    ABSTRACT: A possible scheme of realizing shell model calculations for heavy nuclei is based on a deformed basis and the projection technique. Here we present a new development for odd–odd nuclei, in which one starts with triaxially-deformed multi-quasi-particle configurations, builds the shell-model space through exact three-dimensional angular-momentum-projection, and diagonalizes a two-body Hamiltonian in this space. The model enables us to study the old problem of signature inversion from a different view. With an excellent reproduction of the experimental data in the mass-130 region, the results tend to interpret the phenomenon as a manifestation of dynamical drift of the rotational axis with presence of axial asymmetry in these nuclei.
    Physics Letters B 01/2006; · 4.57 Impact Factor


Available from

Zao-Chun Gao