Definition of the actinide region of static quadrupole-octupole deformation

Sheline, R.K.

doi:10.1016/0370-2693(87)91042-2

Cited by 32 publications

(19 citation statements)

References 17 publications

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“…We therefore adopt V=7/2 + for the 299 keV level. The assignment of 3/2 + to the 321 keV level is strongly suggested by the population and depopulation of this level: the level is populated by a favoured a-transition from the ground state of /2STh, for which I~=3/2 + has been suggested [10]. It decays by a M1 transition to the ground state, but not to the 53 keV 7/2 + level.…”

Section: Discussionmentioning

confidence: 96%

Level structure of217Rn and221Ra investigated in the alpha-decay225Th ?221Ra ?217Rn

Ackermann

Bihn

Butler

et al. 1989

Z. Physik A - Atomic Nuclei

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The nuclei 22~Ra and 217Rn have been investigated in the e-decay chain 225Th--* 221Ra --->217Rn through 7-ray and conversion-electron studies. The short-lived Z25Th nuclei (T1/z=8 rain) were produced in the 226Ra(e, 5n) reaction, and y-rays and conversion electrons were measured -between the irradiation periods -in coincidence with eparticles. In 221Ra the five lowest levels are interpreted as members of a K=5/2 paritydoublet with AE~= 104 keV. These levels, as well as a higher-lying K~= 3/2 + band, are consistent with an octupole deformation of 2z: Ra, as expected from theoretical considerations. In 217Rn only three excited levels are observed, with a favoured e-decay to a 5/2 + excited level thus establishing positive parity for the ground state of 221Ra.

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Section: Discussionmentioning

confidence: 96%

Level structure of217Rn and221Ra investigated in the alpha-decay225Th ?221Ra ?217Rn

Ackermann

Bihn

Butler

et al. 1989

Z. Physik A - Atomic Nuclei

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“…, a negative-parity band lying systematically higher than the ground-state band is a footprint of octupole vibrations. The transition from the regime of octupole vibrations into the region of octupole deformation has been considered by several authors [6][7][8]. A complete algebraic classification of the states occuring in the simultaneous presence of the quadrupole and octupole degrees of freedom has been provided in terms of the spdf-interacting boson model (IBM) [9,10], involving free parameters.…”

Section: Introductionmentioning

confidence: 99%

Analytic description of critical-point actinides in a transition from octupole deformation to octupole vibrations

et al. 2005

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An analytic collective model in which the relative presence of the quadrupole and octupole deformations is determined by a parameter (φ 0 ), while axial symmetry is obeyed, is developed. The model [to be called the analytic quadrupole octupole axially symmetric model (AQOA)] involves an infinite well potential, provides predictions for energy and B(EL) ratios, which depend only on φ 0 , draws the border between the regions of octupole deformation and octupole vibrations in an essentially parameter-independent way, and describes well 226 Th and 226 Ra, for which experimental energy data are shown to suggest that they lie close to this border. The similarity of the AQOA results with φ 0 = 45 • for ground-state band spectra and B(E2) transition rates to the predictions of the X(5) model is pointed out. Analytic solutions are also obtained for Davidson potentials of the form β 2 + β 4 0 /β 2 , leading to the AQOA spectrum through a variational procedure.

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“…The inversion of the odd-even staggering behavior has long been associated with octupole deformation and reflectionasymmetric shapes [16]. Figure 6 illustrates this inversion for isotopes below 229 Ra (N = 141), consistent with the octupole deformation known to be present in the 220 A 228 mass range [30]. Normal odd-even staggering is restored for 229 Ra and beyond, where the neutron-rich radium isotopes return to their reflection-symmetric shape.…”

Section: Odd-even Staggeringmentioning

confidence: 63%

Laser-spectroscopy studies of the nuclear structure of neutron-rich radium

Lynch¹,

Wilkins²,

Billowes³

et al. 2018

Phys. Rev. C

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The neutron-rich radium isotopes, 222−233 Ra, were measured with Collinear Resonance Ionization Spectroscopy (CRIS) at the ISOLDE facility, CERN. The hyperfine structure of the 7s 2 1 S 0 → 7s7p 3 P 1 transition was probed, allowing measurement of the magnetic moments, quadrupole moments, and changes in mean-square charge radii. These results are compared to existing literature values, and the new moments and change in mean-square charge radii of 231 Ra are presented. Low-resolution laser spectroscopy of the very neutron-rich 233 Ra has allowed the isotope shift and relative charge radius to be determined for the first time.

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Definition of the actinide region of static quadrupole-octupole deformation

Cited by 32 publications

References 17 publications

Level structure of217Rn and221Ra investigated in the alpha-decay225Th ?221Ra ?217Rn

Level structure of217Rn and221Ra investigated in the alpha-decay225Th ?221Ra ?217Rn

Analytic description of critical-point actinides in a transition from octupole deformation to octupole vibrations

Laser-spectroscopy studies of the nuclear structure of neutron-rich radium

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