Charge radii of radium isotopes

Wansbeek, L. W.; Schlesser, S.; Sahoo, B. K.; Dieperink, A.E.L.; Onderwater, C. J. G.; Timmermans, Robertus

doi:10.1103/physrevc.86.015503

Cited by 26 publications

(35 citation statements)

References 39 publications

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“…for [220][221][222][223][224][225][226][227][228] Fr [45], we converted our δ r 2 A,221 values and the Dzuba δ r 2 A,212 values to be with respect to 213 Fr(N = 126). The obtained δ r 2 N,126 values for francium can then be compared to the ones for radium [59], defined relative to 214 88 Ra(N = 126). The comparison is shown in Fig.…”

Section: B Magnetic Dipole Momentsmentioning

confidence: 99%

“…The neutron-rich radium isotopes have long been associated with octupole deformations ([1] and references therein) and most noticeably 224 Ra displays a stable reflection-asymmetric deformation of its nuclear shape [2]. The theoretical error bands for radium are significant [59], making the comparison difficult, but nevertheless Fig. 10 shows that the two isotopic chains follow a very similar trend along the whole mass range.…”

Section: B Magnetic Dipole Momentsmentioning

confidence: 99%

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Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

et al. 2014

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Accepted for publication with Physical Review CThe magnetic dipole moments and changes in mean-square charge radii of the neutron-rich $^{218m,219,229,231}\text{Fr}$ isotopes were measured with the newly-installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line at ISOLDE, CERN, probing the $7s~^{2}S_{1/2}$ to $8p~^{2}P_{3/2}$ atomic transition. The $\delta\langle r^{2}\rangle^{A,221}$ values for $^{218m,219}\text{Fr}$ and $^{229,231}\text{Fr}$ follow the observed increasing slope of the charge radii beyond $N~=~126$. The charge radii odd-even staggering in this neutron-rich region is discussed, showing that $^{220}\text{Fr}$ has a weakly inverted odd-even staggering while $^{228}\text{Fr}$ has normal staggering. This suggests that both isotopes reside at the borders of a region of inverted staggering, which has been associated with reflection-asymmetric shapes. The $g(^{219}\text{Fr}) = +0.69(1)$ value supports a $\pi 1h_{9/2}$ shell model configuration for the ground state. The $g(^{229,231}\text{Fr})$ values support the tentative $I^{\pi}(^{229,231}\text{Fr}) = (1/2^{+})$ spin, and point to a $\pi s_{1/2}^{-1}$ intruder ground state configuration

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Section: B Magnetic Dipole Momentsmentioning

confidence: 99%

Section: B Magnetic Dipole Momentsmentioning

confidence: 99%

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

et al. 2014

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“…[63,64]. In this calculation, we consider a Dirac-CoulombBreit Hamiltonian and lower order QED corrections in the approximations described in Ref.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Unexpectedly large difference of the electron density at the nucleus in the $$ 4p\, ^2{\mathrm {P}}_{{1}/{2},{3}/{2}}$$ 4 p 2 P 1 / 2 , 3 / 2 fine-structure doublet of Ca $$^+$$ +

et al. 2016

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We measured the isotope shift in the 2 S1 /2 → 2 P3 /2 (D2) transition in singly-ionized calcium ions using photon recoil spectroscopy. The high accuracy of the technique enables us to resolve the difference between the isotope shifts of this transition to the previously measured isotopic shifts of the 2 S1 /2 → 2 P1 /2 (D1) line. This so-called splitting isotope shift is extracted and exhibits a clear signature of field shift contributions. From the data we were able to extract the small difference of the field shift coefficient and mass shifts between the two transitions with high accuracy. This J-dependence is of relativistic origin and can be used to benchmark atomic structure calculations. As a first step, we use several ab initio atomic structure calculation methods to provide more accurate values for the field shift constants and their ratio. Remarkably, the high-accuracy value for the ratio of the field shift constants extracted from the experimental data is larger than all available theoretical predictions.

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“…For a competitive extraction of sin 2 θ W the precision of the atomic theory of the Ra + ion needs to be improved further to the sub-percent level. Work towards this is in progress [24]. The experiment is expected to produce an APV signal from a single Ra + ion within the coming three years.…”

Section: Ra + Production and Spectroscopymentioning

confidence: 97%

Towards a precise measurement of atomic parity violation in a single Ra + ion

et al. 2013

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A single trapped Ra + (Z = 88) ion provides a very promising route towards a most precise measurement of Atomic Parity Violation (APV), since APV effects grow faster than Z 3 . This experiment promises the best determination of the electroweak coupling constant at the lowest accessible energies. Such a measurement provides a sensitive test of the Standard Model in particle physics. At the present stage of the experiment, we focus on trapping and laser cooling stable Ba + ions as a precursor for radioactive Ra + . Online laser spectroscopy of the isotopes 209−214 Ra + in a linear Paul trap has provided information on transition wavelengths, fine and hyperfine structures and excited state lifetimes as test of atomic structure calculations. Additionaly, a single trapped Ra + ion could function as a very stable clock.

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Charge radii of radium isotopes

Cited by 26 publications

References 39 publications

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

Unexpectedly large difference of the electron density at the nucleus in the $$ 4p\, ^2{\mathrm {P}}_{{1}/{2},{3}/{2}}$$ 4 p 2 P 1 / 2 , 3 / 2 fine-structure doublet of Ca $$^+$$ +

Towards a precise measurement of atomic parity violation in a single Ra + ion

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