Simplified approach to interacting boson approximation-2 calculations using Hamiltonian invariants - art. no. 011301

A systematic study of predictions of the interacting boson approximation (I BA)-2 model leads to the identification of two parameter invariants such th at calculations with the same values of the invariants yield results that a re identical in certain cases and show close similarities under a wider set of conditions. The invariants validate a much-used form of the IBA-2 Hamil tonian and provide a systematic method to simplify IBA-2 calculations by ch oosing a truncated Hamiltonian with the same invariant values as more gener al Hamiltonians.