  The properties of the isoscalar giant monopole resonance (ISGMR) for the
double magic $^{48}$Ca are analyzed in the framework of a microscopic model
based on Skyrme-type interactions. A method for simultaneously taking into
account the coupling between one-, two-, and three-phonon terms in the wave
functions of $0^{+}$ states has been developed. The inclusion of three-phonon
configurations leads to a substantial redistribution of the ISGMR strength to
lower energy $0^{+}$ states and also higher energy tail. Our results
demonstrate that the developed approach enables to us to describe a gross
structure of the ISGMR spreading width.
