Abstract. The symplectic realization of the phenomenological algebraic model is employed for the description of the structure of different low lying collective excited states in heavy even-even nuclei. First we illustrate the parabolic distribution of the energies of low lying collective states and further within the Interacting Vector Boson Model (IVBM) we analyze the structure of these states. The analysis is performed with the fixed set of parameters extracted from the fitting of the model energies with the experimental data for different K^π rotational bands. The estimation of the transition probabilities is also carried out.

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