Microscopic Restoration of Proton-Neutron Mixed Symmetry in Weakly Collective Nuclei

Abstract

Starting from the microscopic low-momentum nucleon-nucleon interaction V{low k}, we present the first systematic shell model study of magnetic moments and magnetic dipole transition strengths of the basic low-energy one-quadrupole phonon excitations in nearly-spherical nuclei. Studying in particular the even-even N=52 isotones from 92Zr to 100Cd, we find the predicted evolution of the predominantly proton-neutron non-symmetric state reveals a restoration of collective proton-neutron mixed-symmetry structure near mid-shell. This provides the first explanation for the existence of pronounced collective mixed-symmetry structures in weakly-collective nuclei.

arXiv comment5 Pages, 3 figures

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Cited by in corpus (7)

• Magnetic dipole excitations in nuclei: elementary modes of nucleonic motion
• Measured g factors and the tidal-wave description of transitional nuclei near A = 100
• Proton-neutron symmetry in 92Zr, 94Mo with Skyrme interactions in a separable approximation
• Mixed-symmetry octupole and hexadecapole excitations in the N=52 isotones
• E2 strengths and transition radii difference of one-phonon 2+ states of 92Zr from electron scattering at low momentum transfer
• Fermionic-bosonic couplings in a weakly-deformed odd-mass nucleus, ${}_{41}^{93}$Nb
• Isolated one-phonon mixed-symmetry 2+ state of the radioactive neutron-rich nuclide 132Te