Abstract
Properties of the states of yrast bands in even Ba isotopes are studied on the basis of the boson representation of fermion operators. The parameters of the boson Hamiltonian and the interaction between collective quadrupole bosons, positive parity bosons, and spins $${{J}^{\pi }}$$ from $${{0}^{ + }}$$ to $${{10}^{ + }}$$ are calculated microscopically. This approach describes band crossing in the yrast bands and reproduces their energies and $$B(E2)$$ within these bands up to $${{I}^{\pi }} = {{18}^{ + }}.$$
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