| Article | |
| Report number | arXiv:1407.0563 |
| Title | Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry |
| Author(s) | Budinčević, I. (KU Leuven, Dept. Phys. Astron.) ; Billowes, J. (Manchester U.) ; Bissell, M.L. (KU Leuven, Dept. Phys. Astron.) ; Cocolios, T.E. (Manchester U.) ; de Groote, R.P. (KU Leuven, Dept. Phys. Astron.) ; De Schepper, S. (KU Leuven, Dept. Phys. Astron.) ; Fedosseev, V.N. (CERN) ; Flanagan, K.T. (Manchester U.) ; Franchoo, S. (Orsay, IPN) ; Garcia Ruiz, R.F. (KU Leuven, Dept. Phys. Astron.) ; Heylen, H. (KU Leuven, Dept. Phys. Astron.) ; Lynch, K.M. (KU Leuven, Dept. Phys. Astron. ; Manchester U. ; CERN) ; Marsh, B.A. (CERN) ; Neyens, G. (KU Leuven, Dept. Phys. Astron.) ; Procter, T.J. (Manchester U.) ; Rossel, R.E. (CERN ; Mainz U., Inst. Phys.) ; Rothe, S. (CERN) ; Strashnov, I. (Manchester U.) ; Stroke, H.H. (New York U.) ; Wendt, K.D.A. (Mainz U., Inst. Phys.) |
| Publication | 2014-07-23 |
| Imprint | 02 Jul 2014 |
| Number of pages | 9 |
| Note | Accepted for publication with Physical Review C |
| In: | Phys. Rev. C 90 (2014) 014317 |
| DOI | 10.1103/PhysRevC.90.014317 |
| Subject category | nucl-ex |
| Abstract | The 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. |
| Copyright/License | arXiv nonexclusive-distrib. 1.0 Publication: © 2014-2025 American Physical Society |
Corresponding record in: Inspire
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