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Collective magnetic excitations and backbending in fast rotating nuclei
No full textWe study in cranked Nilsson plus random phase approximation the electric monopole sE0d, quadrupole sE2d,
and magnetic dipole sM1d responses in fast rotating nuclei undergoing backbending, more specifically 156Dy
and 158Er. Special attention is paid at the orbital M1 excitations known as scissors mode. We find that the
overall strength of the orbital M1 transitions gets enhanced by more than a factor of 4 above the critical
backbending region. We show that such a strength evolves with the rotational frequency in close correspondence
with the nuclear moment of inertia. This link provides the main clue for understanding the physical
origin of such an enhancement, which, if experimentally confirmed, would represent a distinctive feature of
nuclei exhibiting backbending
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