Calculation of imaginary part of the optical potential in collective model for spherical nuclei

The paper is concerned with the angular dependence of the imaginary part of the optical potential for even-even nuclei in the low-energy region with allowance for excitation of lower collective states of the target nucleus. It is shown that the principal contribution to Im Vopt is made by the low collective states 2$^{+}$ and 3${-}$ of the target, which completely exhaust the entire imaginary part of the optical potential in the low-energy region. According to calculations, the contribution to Im Vopt, due to formation of the compound nucleus is small.