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.

References in corpus (9)

• Galaxy clusters discovered with a Sunyaev-Zel'dovich effect survey
• Evidence for Triangular D_3h Symmetry in 12C
• Evidence for tetrahedral symmetry in 16O
• Giant Dipole Resonance as a Fingerprint of $\alpha$ Clustering Configurations in ${}^{12}$C and ${}^{16}$O
• Bound clusters on top of doubly magic nuclei
• Density Functional Theory studies of cluster states in nuclei
• Dipole responses in Nd and Sm isotopes with shape transitions
• The exclusion of a significant range of ages in a massive star cluster
• Critical Temperature for $\alpha$-Particle Condensation within a Momentum Projected Mean Field Approach

Cited by in corpus (2)

• Spectroscopy of quadrupole and octupole states in rare-earth nuclei from a Gogny force
• Spectral statistics of rare-earth nuclei: Investigation of shell model configuration effect