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of the Hamiltonian (1). One can see the overall good agreement between the calculated and experimental spectra. The comparison of the experimental and calculated results for the states of the ground state and of the first excited negative parity bands are presented in Fig.3 in more details. It is seen that the agreement is rather good at all values of angular momenta. Both, the ground-state and the first negative parity bands exhibit approximately an equidistant behavior which is related to the harmonic quadrupole oscillations of the heavy fragment. 

The calculation shows that mainly two eigenvectors of ˆ H$_{0}$ are present in the wave function of the state of the ground state band, namely, [ | I 2 I $_{2}$( I )) × Y$_{0}$ ] ( IM ) and [ | I − 2 2 I − 2 2 ( I − 2)) × Y$_{2}$ ] ( IM $_{)}$. The contribution of the first of them is predominant at low angular momenta. As a conse- quence at low angular momenta the ground state band has an equidistant spectrum with the energy differences determined mainly by the frequency of the harmonic quadrupole oscillations of the heavy fragment. With increase of the angular momentum, the distance between the levels is slightly increased, due to the growing admixture of the component [ | I − 2 2 I − 2 2 ( I − 2)) × Y$_{2}$ ] ( IM ) to the wave function. This introduces a small nonlinear depen- dence of the γ -transition energies as a function of the angular momentum. 

