Abstract
The distribution of the M2 strength in spherical nuclei is studied within the quasiparticle-phonon nuclear model. It is shown that the interaction of the one- and two-phonon states affects strongly this distribution at the excitation energies E x > 15 MeV. In all the nuclei the strength of the M2 transitions is concentrated in the excitation energy region of 6–12 MeV. At these energies the calculated total value of B(M2)↑ is in good agreement with the experimental data in 90Zr and 208Pb. The calculations show that a group of states observed in 58Ni at an energy of about 7 MeV in the (e, e′) experiments is a part of the M2 resonance.
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