A simple description of the states $0^+$ and $2^+$ in $^{168}Er$
Abstract
Description
A sixth-order quadrupole boson Hamiltonian is used to describe 26 states $0^+$ and 67 states $2^+$ which have been recently identified in $^{168}Er$. Two closed expressions are alternatively used for energy levels. One corresponds to a semi-classical approach while the other one represents the exact eigenvalue of the model Hamiltonian. The semi-classical expression involves four parameters, while the exact eigenvalue is determined by five parameters. In each of the two descriptions a least square fit procedure is adopted.
Both expressions provide a surprisingly good agreement with the experimental data.
9 pages, 5 figures
9 pages, 5 figures