Origin of Low-Lying Enhanced E1 Strength in Rare-Earth Nuclei

Abstract

The experimental $E1$ strength distribution below 4 MeV in rare-earth nuclei suggests a local breaking of isospin symmetry. In addition to the octupole states, additional $1^{-}$ states with enhanced E1 strength have been observed in rare-earth nuclei by means of ($\gamma ,{\gamma }^{\prime }$) experiments. By reproducing the experimental results, the spdf interacting boson model calculations provide further evidence for the formation of an $\alpha$ cluster in medium-mass nuclei and might provide a new understanding of the origin of low-lying E1 strength.

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Cited by in corpus (13)

• Spectroscopy of quadrupole and octupole states in rare-earth nuclei from a Gogny force
• Isoscalar dipole transition as a probe for asymmetric clustering
• Alpha decay as a probe for the structure of neutron-deficient nuclei
• Octupole correlations in light actinides from the interacting boson model based on the Gogny energy density functional
• High-resolution $(p,t)$ study of low-spin states in ${}^{240}$Pu: Octupole excitations, $\alpha$ clustering, and other structure features
• Isoscalar and neutron modes in the E1 spectra of Ni isotopes and the relevance of shell effects and the continuum
• Breaking of axial symmetry in excited heavy nuclei as identified in Giant Dipole Resonance data
• The decay of quadrupole-octupole $1^{-}$ states in ${}^{40}$Ca and ${}^{140}$Ce
• Isoscalar monopole and dipole transitions in ${}^{24}$Mg, ${}^{26}$Mg and ${}^{28}$Si
• Spectral statistics of rare-earth nuclei: Investigation of shell model configuration effect
• Quadrupole properties of the eight $SU(3)$ algebras in $(sdgi)$ space
• Mapped $spdf$ interacting boson model for quadrupole-octupole collective states in nuclei
• Computing nuclear response functions with time-dependent coupled-cluster theory