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

I. Budinčević; Jonathan 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; Ilya 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, Jonathan 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, Ilya Strashnov, H. H. Stroke, K. D A Wendt

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Abstract

The magnetic dipole moments and changes in mean-square charge radii of the neutron-rich ^{218m,219,229,231}Fr 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 7s²S_1/2 to 8p²P_3/2 atomic transition. The δ⟨r²⟩^A,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 π1h_9/2 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 πs−11/2 intruder ground-state configuration.

Original language	English
Article number	014317
Pages (from-to)	1-9
Number of pages	9
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.90.014317
Publication status	Published - 23 Jul 2014

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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), 1-9. Article 014317. https://doi.org/10.1103/PhysRevC.90.014317

@article{2a8448a62e23466ca2769f24e473f546,

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 δ⟨r2⟩A,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 πs−11/2 intruder ground-state configuration.",

author = "I. Budin{\v c}evi{\'c} and Jonathan 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 Ilya Strashnov and Stroke, {H. H.} and Wendt, {K. D A}",

year = "2014",

month = jul,

day = "23",

doi = "10.1103/PhysRevC.90.014317",

language = "English",

volume = "90",

pages = "1--9",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

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}

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, pp. 1-9. https://doi.org/10.1103/PhysRevC.90.014317

TY - JOUR

T1 - Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry

AU - Budinčević, I.

AU - Billowes, Jonathan

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, Ilya

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 δ⟨r2⟩A,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 πs−11/2 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 δ⟨r2⟩A,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 πs−11/2 intruder ground-state configuration.

UR - http://www.scopus.com/inward/record.url?eid=2-s2.0-84905170005&partnerID=MN8TOARS

U2 - 10.1103/PhysRevC.90.014317

DO - 10.1103/PhysRevC.90.014317

M3 - Article

SN - 0556-2813

VL - 90

SP - 1

EP - 9

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 1

M1 - 014317

ER -

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

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