Abstract
To clarify the physical nature of the orbital magnetic dipole excitations discussed widely in the past few years, a semiclassical model is presented and the nuclei156Gd and164Dy are investigated microscopically. The semi-classical model involves a consistent treatment of vibrational and rotational degrees of freedom; the microscopic results are obtained in quasiparticle-random-phase approximation (QRPA) with a realistic effective interaction. The results disagree with the picture of scissors modes or rotational vibrations.
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Dedicated to Prof. Dr. H.J. Mang on the occasion of his 60th birthday
We thank Roger Hilton and Peter Ring for discussions, and Malcolm Macfarlane for discussions and a careful reading of the manuscript. The main part of the numerical computations has been done at the RRZN (Regionales Rechenzentrum für Niedersachsen).