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

I. Budinčević; J. Billowes; M. L. Bissell; T. E. Cocolios; R. P. De Groote; S. De Schepper; V. N. Fedosseev; K. T. Flanagan; S. Franchoo; R. F. Garcia Ruiz; H. Heylen; K. M. Lynch; B. A. Marsh; G. Neyens; T. J. Procter; R. E. Rossel; S. Rothe; I. Strashnov; H. H. Stroke; K. D.A. Wendt

doi:10.1103/PhysRevC.90.014317

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

I. Budinčević, J. Billowes, M. L. Bissell, T. E. Cocolios, R. P. De Groote, S. De Schepper, V. N. Fedosseev, K. T. Flanagan, S. Franchoo, R. F. Garcia Ruiz, H. Heylen, K. M. Lynch, B. A. Marsh, G. Neyens, T. J. Procter, R. E. Rossel, S. Rothe, I. Strashnov, H. H. Stroke, K. D.A. Wendt

Research output: Contribution to journal › Article › peer-review

Abstract

The magnetic dipole moments and changes in mean-square charge radii of the neutron-rich 218m,219,229,231Fr isotopes were measured with the newly installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line at the On-Line Isotope Mass Separator (ISOLDE), CERN, probing the 7s2S1/2 to 8p2P3/2 atomic transition. The δr2A,221 values for 218m,219Fr and 229,231Fr 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 220Fr has a weakly inverted odd-even staggering while 228Fr 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(219Fr)=+0.69(1) value supports a π1h9/2 shell-model configuration for the ground state. The g(229,231Fr) values support the tentative Iπ(229,231Fr)=(1/ 2+) spin and point to a πs1/2-1 intruder ground-state configuration.

Original language	English (US)
Article number	014317
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.90.014317
State	Published - Jul 23 2014

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.90.014317

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Budinčević, I., Billowes, J., Bissell, M. L., Cocolios, T. E., De Groote, R. P., De Schepper, S., Fedosseev, V. N., Flanagan, K. T., Franchoo, S., Garcia Ruiz, R. F., Heylen, H., Lynch, K. M., Marsh, B. A., Neyens, G., Procter, T. J., Rossel, R. E., Rothe, S., Strashnov, I., Stroke, H. H., & Wendt, K. D. A. (2014). Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry. Physical Review C - Nuclear Physics, 90(1), Article 014317. https://doi.org/10.1103/PhysRevC.90.014317

Budinčević, I, Billowes, J, Bissell, ML, Cocolios, TE, De Groote, RP, De Schepper, S, Fedosseev, VN, Flanagan, KT, Franchoo, S, Garcia Ruiz, RF, Heylen, H, Lynch, KM, Marsh, BA, Neyens, G, Procter, TJ, Rossel, RE, Rothe, S, Strashnov, I, Stroke, HH & Wendt, KDA 2014, 'Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry', Physical Review C - Nuclear Physics, vol. 90, no. 1, 014317. https://doi.org/10.1103/PhysRevC.90.014317

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title = "Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry",

abstract = "The magnetic dipole moments and changes in mean-square charge radii of the neutron-rich 218m,219,229,231Fr isotopes were measured with the newly installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line at the On-Line Isotope Mass Separator (ISOLDE), CERN, probing the 7s2S1/2 to 8p2P3/2 atomic transition. The δr2A,221 values for 218m,219Fr and 229,231Fr 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 220Fr has a weakly inverted odd-even staggering while 228Fr 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(219Fr)=+0.69(1) value supports a π1h9/2 shell-model configuration for the ground state. The g(229,231Fr) values support the tentative Iπ(229,231Fr)=(1/ 2+) spin and point to a πs1/2-1 intruder ground-state configuration.",

author = "I. Budin{\v c}evi{\'c} and J. Billowes and Bissell, {M. L.} and Cocolios, {T. E.} and {De Groote}, {R. P.} and {De Schepper}, S. and Fedosseev, {V. N.} and Flanagan, {K. T.} and S. Franchoo and {Garcia Ruiz}, {R. F.} and H. Heylen and Lynch, {K. M.} and Marsh, {B. A.} and G. Neyens and Procter, {T. J.} and Rossel, {R. E.} and S. Rothe and I. Strashnov and Stroke, {H. H.} and Wendt, {K. D.A.}",

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doi = "10.1103/PhysRevC.90.014317",

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AU - Budinčević, I.

AU - Billowes, J.

AU - Bissell, M. L.

AU - Cocolios, T. E.

AU - De Groote, R. P.

AU - De Schepper, S.

AU - Fedosseev, V. N.

AU - Flanagan, K. T.

AU - Franchoo, S.

AU - Garcia Ruiz, R. F.

AU - Heylen, H.

AU - Lynch, K. M.

AU - Marsh, B. A.

AU - Neyens, G.

AU - Procter, T. J.

AU - Rossel, R. E.

AU - Rothe, S.

AU - Strashnov, I.

AU - Stroke, H. H.

AU - Wendt, K. D.A.

PY - 2014/7/23

Y1 - 2014/7/23

N2 - The magnetic dipole moments and changes in mean-square charge radii of the neutron-rich 218m,219,229,231Fr isotopes were measured with the newly installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line at the On-Line Isotope Mass Separator (ISOLDE), CERN, probing the 7s2S1/2 to 8p2P3/2 atomic transition. The δr2A,221 values for 218m,219Fr and 229,231Fr 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 220Fr has a weakly inverted odd-even staggering while 228Fr 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(219Fr)=+0.69(1) value supports a π1h9/2 shell-model configuration for the ground state. The g(229,231Fr) values support the tentative Iπ(229,231Fr)=(1/ 2+) spin and point to a πs1/2-1 intruder ground-state configuration.

AB - The magnetic dipole moments and changes in mean-square charge radii of the neutron-rich 218m,219,229,231Fr isotopes were measured with the newly installed Collinear Resonance Ionization Spectroscopy (CRIS) beam line at the On-Line Isotope Mass Separator (ISOLDE), CERN, probing the 7s2S1/2 to 8p2P3/2 atomic transition. The δr2A,221 values for 218m,219Fr and 229,231Fr 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 220Fr has a weakly inverted odd-even staggering while 228Fr 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(219Fr)=+0.69(1) value supports a π1h9/2 shell-model configuration for the ground state. The g(229,231Fr) values support the tentative Iπ(229,231Fr)=(1/ 2+) spin and point to a πs1/2-1 intruder ground-state configuration.

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

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