Octupole collectivity in nuclei

Butler, P. A.

doi:10.1088/0954-3899/43/7/073002

Cited by 131 publications

(140 citation statements)

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“…Reflection-asymmetric shapes are characterized by the occurrence of low-lying negative-parity bands, as well as pronounced electric dipole and octupole transitions [1][2][3][4]. The physics of octupole correlations was extensively explored in the 1980s and 1990s (see the review of Ref.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy of reflection-asymmetric nuclei with relativistic energy density functionals

Xia

Tao

et al. 2017

Phys. Rev. C

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Quadrupole and octupole deformation energy surfaces, low-energy excitation spectra and transition rates in fourteen isotopic chains: Xe, Ba, Ce, Nd, Sm, Gd, Rn, Ra, Th, U, Pu, Cm, Cf, and Fm, are systematically analyzed using a theoretical framework based on a quadrupole-octupole collective Hamiltonian (QOCH), with parameters determined by constrained reflection-asymmetric and axially-symmetric relativistic mean-field calculations. The microscopic QOCH model based on the PC-PK1 energy density functional and δ-interaction pairing is shown to accurately describe the empirical trend of low-energy quadrupole and octupole collective states, and predicted spectroscopic properties are consistent with recent microscopic calculations based on both relativistic and non-relativistic energy density functionals. Low-energy negative-parity bands, average octupole deformations, and transition rates show evidence for octupole collectivity in both mass regions, for which a microscopic mechanism is discussed in terms of evolution of single-nucleon orbitals with deformation.

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Section: Introductionmentioning

confidence: 99%

Spectroscopy of reflection-asymmetric nuclei with relativistic energy density functionals

Xia

Tao

et al. 2017

Phys. Rev. C

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Section: Discussionmentioning

confidence: 99%

“…On the other hand, 220 Rn has similar octupole strength to 208 Pb, 230,232 Th and 234 U, consistent with it being an octupole vibrator. More details on the comparison with theoretical models and the relevance of these measurements to searches for CP-violating static electric dipole moments in atoms can be found in [102].…”

Section: Octupole Deformed Structures In Nuclei With a ≈ 220mentioning

confidence: 99%

Nuclear-structure studies of exotic nuclei with MINIBALL

Butler

Cederkäll

Reiter

2017

J. Phys. G: Nucl. Part. Phys.

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High-resolution γ-ray spectroscopy has been established at ISOLDE for nuclear-structure and nuclear-reaction studies with reaccelerated radioactive ion beams provided by the REX-ISOLDE facility. The MINIBALL spectrometer comprises 24 six-fold segmented, encapsulated high-purity germanium crystals. It was specially designed for highest γ-ray detection efficiency which is advantageous for low-intensity radioactive ion beams. The MINIBALL array has been used in numerous Coulomb-excitation and transfer-reaction experiments with exotic ion beams of energies up to 3 MeV A -1 . The physics case covers a wide range of topics which are addressed with beams ranging from neutron-rich magnesium isotopes up to heavy radium isotopes. In the future the HIE-ISOLDE will allow the in-beam γ-ray spectroscopy program to proceed with higher secondary-beam intensity, higher beam energy and better beam quality.

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“…Intense octupole correlations leading to asymmetric nuclear shapes are known to develop in certain regions of the nuclear chart, where octupole-octupole interactions contribute to the equilibrium energy (see [75] for a recent review). In a multipole expansion of the nuclear surface, the magnitude of the octupole correlations depend on the matrix elements of the Y 30 spherical harmonic between single Figure 7.…”

Section: Study Of Octupole Correlationsmentioning

confidence: 99%

Fast-timing spectroscopy at ISOLDE

Fraile

2017

J. Phys. G: Nucl. Part. Phys.

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View the article online for updates and enhancements. Related contentNuclear-structure studies of exotic nuclei with MINIBALL P A Butler, J Cederkall and P Reiter AbstractThe advanced time-delayed bgg(t) method has been used at ISOLDE since the relocation of the facility from the synchrocyclotron to the CERN proton synchrotron booster, a quarter of a century ago. The method was designed for precision measurements with low-intensity beams, achieving good efficiency and excellent time resolution with a compact setup. Over this time the technique has evolved to cope with the challenge of measuring lifetimes of complex level schemes of increasingly exotic nuclei populated in β decay. The ISOLDE facility provides unsurpassed opportunities to study many regions of the nuclide chart. The physics case encompasses topics of interest across the nuclide chart, including the evolution of shell structure around neutron shell and subshell closures such as N=20, N=40 and N=50, shape coexistence, and octupole correlations in heavy nuclei. The recently commissioned ISOLDE decay station provides enhanced capabilities that will be fully exploited with the increased beam intensities available at the upcoming HIE-ISOLDE facility.

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Octupole collectivity in nuclei

Cited by 131 publications

References 141 publications

Spectroscopy of reflection-asymmetric nuclei with relativistic energy density functionals

Spectroscopy of reflection-asymmetric nuclei with relativistic energy density functionals

Nuclear-structure studies of exotic nuclei with MINIBALL

Fast-timing spectroscopy at ISOLDE

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