High-energy scissors mode

Abstract

All the orbital M1 excitations, at both low and high energies, obtained from a rotationally invariant QRPA, represent the fragmented scissors mode. The high-energy M1 strength is almost purely orbital and resides in the region of the isovector giant quadrupole resonance. In heavy deformed nuclei the high-energy scissors mode is strongly fragmented between 17 and 25 MeV (with uncertainties arising from the poor knowledge of the isovector potential). The coherent scissors motion is hindered by the fragmentation and $B(M1)<0.25{\mu }_N^2$ for single transitions in this region. The $(e,e^{\prime })$ cross sections for excitations above 17 MeV are one order of magnitude larger for E2 than for M1 excitations even at backward angles.

20 pages in RevTEX, 5 figures (uuencoded,put with 'figures') accepted for publication in Phys.Rev. C

References in corpus (1)

• Orbital M1 versus E2 strength in deformed nuclei: A new energy weighted sum rule

Cited by in corpus (7)

• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Self-Consistent Velocity Dependent Effective Interactions
• The scissors mode from a different perspective
• The Spin and Orbital Contributions to Magnetic Dipole Transitions
• The Isovector Quadrupole-Quadrupole Interaction Used in Shell Model Calculations
• Competing electric and magnetic excitations in backward electron scattering from heavy deformed nuclei
• Angular and energy dependence of $(e,e^{\prime })$ cross sections for orbital 1${}^{+}$ excitations