<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Fr</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>219</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>, a transitional reflection asymmetric nucleus

Cf, Liang; Paris, P.; Kvasil, J.; Rk, Sheline

doi:10.1103/physrevc.44.676

Cited by 36 publications

(20 citation statements)

References 26 publications

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“…The g-factors of these neutron-rich isotopes are systematically lower than those of the neutron-deficient 207,209,211,213 Fr isotopes. The latter isotopes, near magic N = 126, have a nearly spherical ground state [20], while the neutron-rich isotopes are known to have a deformation larger than ǫ 2 > 0.15 [20] (where ǫ 2 is the Nillson model quadrupole deformation parameter) and exhibit parity doublet bands [11] associated with octupole deformations. These deformations have however only little impact on the g-factors because the Nilsson levels are straight lines (they do not mix with other shell model levels).…”

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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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%

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

et al. 2014

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“…For more detail on the method of calculation see e.g. [22][23][24][25]. We use the standard average Nilsson potential to generate the quasiparticle states.…”

Section: Outline Of Model Formulation and Calculationsmentioning

confidence: 99%

Microscopic structures of parity doublets in the151Pm,153Eu and155Eu nuclei

Nosek

Sheline

Sood

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Abstract. Microscopic structures of the proposed parity doublet bands in the odd-proton Z=61 15~Pm and Z = 63 ~53, ~55Eu nuclei are examined using the quasiparticle phonon nuclear model Hamiltonian including the residual pairing and multipole-multipole interactions. Octupole correlations between intrinsic nonrotational states are studied to check the suggested assignments of parity doublet partners in these nuclei. We conclude significant octupole correlations between a pair of K "= 1/ 2 -+ doublets in each of these nuclei, with somewhat weaker correlations between K'= 3/2 + bands in both the Eu isotopes. No octupole connection between the lowest K "= 5/2 -+ bands is found; however, significant octupole collectivity, built on the low-lying 5/2-bands, is predicted in the higher-lying 5/2 + bands which contain the 5/2 + [402] fragmented strength.

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“…Coriolis mixing is strongest in K ¼ 1=2 bands and tends to decouple the odd-particle spin from the deformation axis [45,46]. The 9=2 − ground state in 219 Fr is known to be a member of the K ¼ 1=2 − band [47]. Thus the odd-proton spin is decoupled from the nuclear deformation axis [see (b) in Fig.…”

mentioning

confidence: 99%

Use of a Continuous Wave Laser and Pockels Cell for Sensitive High-Resolution Collinear Resonance Ionization Spectroscopy

et al. 2015

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New technical developments have led to a 2 orders of magnitude improvement of the resolution of the collinear resonance ionization spectroscopy (CRIS) experiment at ISOLDE, CERN, without sacrificing the high efficiency of the CRIS technique. Experimental linewidths of 20(1) MHz were obtained on radioactive beams of francium, allowing us for the first time to determine the electric quadrupole moment of the short lived [t_{1/2}=22.0(5) ms] ^{219}Fr Q_{s}=-1.21(2) eb, which would not have been possible without the advantages offered by the new method. This method relies on a continuous-wave laser and an external Pockels cell to produce narrow-band light pulses, required to reach the high resolution in two-step resonance ionization. Exotic nuclei produced at rates of a few hundred ions/s can now be studied with high resolution, allowing detailed studies of the anchor points for nuclear theories.

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Fr219, a transitional reflection asymmetric nucleus

Cited by 36 publications

References 26 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

Microscopic structures of parity doublets in the151Pm,153Eu and155Eu nuclei

Use of a Continuous Wave Laser and Pockels Cell for Sensitive High-Resolution Collinear Resonance Ionization Spectroscopy

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