Evolution of Octupole Deformation in Radium Nuclei from Coulomb Excitation of Radioactive ${}^{222}$Ra and ${}^{228}$Ra Beams

Abstract

There is sparse direct experimental evidence that atomic nuclei can exhibit stable pear shapes arising from strong octupole correlations. In order to investigate the nature of octupole collectivity in radium isotopes, electric octupole ($E3$) matrix elements have been determined for transitions in ${}^{222,228}$Ra nuclei using the method of sub-barrier, multi-step Coulomb excitation. Beams of the radioactive radium isotopes were provided by the HIE-ISOLDE facility at CERN. The observed pattern of $E$3 matrix elements for different nuclear transitions is explained by describing ${}^{222}$Ra as pear-shaped with stable octupole deformation, while ${}^{228}$Ra behaves like an octupole vibrator.

arXiv commentto be published in Physical Review Letters

References in corpus (10)

• Direct Evidence of Octupole Deformation in Neutron-Rich ${}^{144}$Ba
• Collective T- and P- Odd Electromagnetic Moments in Nuclei with Octupole Deformations
• Octupole deformation in the ground states of even-even nuclei: a global analysis within the covariant density functional theory
• Direct Evidence for Octupole Deformation in ${}^{146}$Ba and the Origin of Large $E1$ Moment Variations in Reflection-Asymmetric Nuclei
• Improved limit on the ${}^{225}$Ra electric dipole moment
• Heart - Shaped Nuclei: Condensation of Rotational Aligned Octupole Phonons
• Correlating Schiff moments in the light actinides with octupole moments
• Analysis methods of safe Coulomb-excitation experiments with radioactive ion beams using the gosia code
• Spectroscopy of reflection-asymmetric nuclei with relativistic energy density functionals
• The observation of vibrating pear shapes in radon nuclei: update

Cited by in corpus (27)

• Laser Spectroscopy for the Study of Exotic Nuclei
• Spectroscopy of short-lived radioactive molecules: A sensitive laboratory for new physics
• Landscape of pear-shaped even-even nuclei
• Opportunities for Fundamental Physics Research with Radioactive Molecules
• Isotope Shifts of Radium Monofluoride Molecules
• Nuclear magnetization distribution effect in molecules: Ra${}^{+}$ and RaF hyperfine structure
• Evolution of octupole deformation and collectivity in neutron-rich lanthanides
• Octupole correlations in light actinides from the interacting boson model based on the Gogny energy density functional
• Quadrupole-octupole coupling and the onset of octupole deformation in actinides
• Microscopic description of quadrupole-octupole coupling in neutron-rich actinides and superheavy nuclei with the Gogny-D1M energy density functional
• Microscopic description of quadrupole-octupole coupling in actinides with the Gogny-D1M energy density functional
• Microscopic description of octupole collective excitations near $N=56$ and $N=88$
• Pinning down electron correlations in RaF via spectroscopy of excited states and high-accuracy relativistic quantum chemistry
• Quadrupole-octupole coupling and the evolution of collectivity in neutron-deficient Xe, Ba, Ce, and Nd isotopes
• Origin of octupole deformation softness in atomic nuclei
• Systematic shell-model study of Rn isotopes with $A=$ 207 to 216 and isomeric states
• Beyond-mean-field description of octupolarity in dysprosium isotopes with the Gogny-D1M energy density functional
• Mapped interacting boson model for nuclear structure studies
• Coexisting single-particle excitations and octupole correlations in transitional nucleus ${}^{217}\mathbf{Ra}$
• Generator coordinate method for nuclear octupole excitations: status and perspectives
• Mapped $spdf$ interacting boson model for quadrupole-octupole collective states in nuclei
• Scientific Opportunities at the ARIEL Electron Linac
• Octupole correlations in the excited $0^{+}$ states and two-neutron transfers in actinide nuclei
• Microscopic quasifission dynamics of the ${}^{54}\text{Cr}+{}^{243}\text{Am}$ reaction
• Radioactive Molecules as Laboratories of Fundamental Physics
• Probing alternating-parity bands in even-even nuclei within an axial quadrupole-octupole-hexadecapole collective model
• Nuclear Electric Quadrupole Moment-Induced Parity Doubling in Molecules for Symmetry-Violation Searches