K. Nomura, N. Shimizu, D. Vretenar, T. Niksic, T. Otsuka
\gamma-softness in atomic nuclei is investigated in the framework of energy
density functionals. By mapping constrained microscopic energy surfaces for a
set of representative non-axial medium-heavy and heavy nuclei to a Hamiltonian
of the proton-neutron interacting boson model (IBM-2) containing up to
three-body interactions, low-lying collective spectra and transition rates are
calculated. Observables are analyzed that distinguish between the two limiting
geometrical pictures of non-axial nuclei: the rigid-triaxial rotor and the
\gamma-unstable rotor. It is shown that neither of these pictures is realized
in actual nuclei, and that a microscopic description leads to results that are
almost exactly in between the two geometrical limits. This finding points to
the optimal choice of the IBM Hamiltonian for \gamma-soft nuclei.
View original:
http://arxiv.org/abs/1109.5754
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