Abstract
The description of nuclei near closed shells can be simplified if one uses a phonon model to describe the low lying excitations. In this picture the lowest collective excitations of spherical nuclei, i.e. the quadrupole and octupole surface oscillations are treated as 2+ quadrupole phonons and 3- octupole phonons, respectively. One property of the phonon model is the existence of Multi Phonon Excitations near the sum energy of the single phonons due to the coupling of two or more phonons. Much experimental effort has been spent throughout the last years to investigate such states. But due to the admixture of quasiparticle states and anharmonicities in the coupling mechanism the identification of Multi Phonon States is rather difficult.
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