Abstract
The K π =1 + intrinsic excitations and associated M1 strengths in (super) deformed nuclei are studied using the quasiparticle random phase approximation. The sum of B(M1) values in the region of E x<10 MeV at superdeformations is found to be several times larger than that at normal deformations, because of (i) the increase in the proton convection current contribution and (ii) reduced pairing correlations. Moreover, at superdeformations the major part of the calculated low-lying (large) B(M1) values are concentrated in the energy region just below the neutron emission threshold. The high-lying isovector giant quadrupole resonance at superdeformed shapes is found to have about 60% overlap with the “scissors” mode and carries a large B(M1) strength.
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