content_image/334272.jpg content_image/334277.jpg
<img src='content_image/334272.jpg'>

Fig. 4 that the interval of change of ω$_{vib}$ with angular momentum observed experimentally and obtained in calculations is not large. The energy differences between the neighborhood states in bands are varying from 185 keV up to 240 keV. By taking into account the length of the spectra in both energy and angular momentum, the frequency can be with good accuracy treated as a constant. 

The dependence of experimental and calculated values of parity splitting in the ground and the first negative parity bands, treated as a unified alternating parity band, on angular momentum is illustrated in Fig.5. The parity splitting is defined by the expression [12] 

<img src='content_image/334277.jpg'>

It is seen from the figure that for the low angular momenta the parity splitting is positive and becomes negative with angular momentum increase. The possibility for the negative values of the parity splitting is related to the fact that the ground-state band and the first negative parity band are of the vibrational type. In this case the sign of the parity splitting is determined by the difference in energies characterizing the quadrupole vibrations of the heavy fragment and the rotation of the light fragment around the heavy one. Indeed, in the zero approximation E ( I − ) = 1 $_{2}$ω ( I − 1) + ℏ 2 2 µR 2 , E ( I $^{+}$) = 1 $_{2}$ωI and therefore S ( I − ) = 

