Parameter Symmetry of the Interacting Boson Model
  We discuss the symmetry of the parameter space of the interacting boson model (IBM). It is shown that for any set of the IBM Hamiltonian parameters (with the only exception of the U(5) dynamical symmetry limit) one can always find another set that generates the equivalent spectrum. We discuss the origin of the symmetry and its relevance for physical applications. 
Andrey M. Shirokov (1 and 2), N. A. Smirnova (1), Yu. F. Smirnov (1   and 3) ((1) Institute for Nuclear Physics at Moscow St...