Abstract
The fragmentation of the magnetic dipole strength in 206Pb is studied in the framework of the quasiparticle-phonon nuclear model. The calculations reproduce the two-humped shape of the experimental distribution. As in 208Pb there is an isoscalar 1+ state at Ex approximately=5.7 MeV in 206Pb and its wavefunction contains sizable two-phonon components. It is shown that direct transitions from the ground state to two-phonon 1+ states give a negligible contribution to the total excitation probability of the M1 resonance.
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