Laser spectroscopy of francium isotopes at the borders of the region of reflection asymmetry-猫眼课题宝

DOI：

10.1103/physrevc.90.014317

发表时间：

2014-07

期刊：

Physical Review C

影响因子：

3.1

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

I. Budinvcevi'c;J. Billowes;M. Bissell;T. Cocolios;R. P. Groote;S. Schepper;V. Fedosseev;K. Flanagan;S. Franchoo;R. Ruiz;H. Heylen;K. Lynch;B. Marsh;G. Neyens;T. Procter;R. Rossel;S. Rothe;I. Strashnov;H. H. Stroke-H.;K. Wendt

使用 CERN 在线同位素质量分离器 (ISOLDE) 新安装的共线共振电离谱 (CRIS) 束线测量富中子 218m,219,229,231Fr 同位素的磁偶极矩和均方电荷半径变化，探测 7s2S1/2 到 8p2P3/2 原子跃迁。 218m,219Fr 和 229,231Fr 的 ??r2?A,221 值遵循观察到的超过 N = 126 的电荷半径增加斜率。讨论了该富中子区域中的电荷半径奇偶交错，表明 220Fr 具有弱反转的奇偶交错，而 228Fr 具有正常交错。这表明两种同位素都位于倒置交错区域的边界，该区域与反射不对称形状有关。 g(219Fr) = +0.69 (1) 值支持基态的 ?1h9/2 壳模型配置。 g(229,231Fr)值支持暂定I?(229,231Fr)=(1/2+)自旋并指向?s?1入侵者基态配置。

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 ??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 ?1h9/2 shell-model configuration for the ground state. The g(229,231Fr) valuessupportthetentativeI?(229,231Fr)=(1/2+) spin and point to a ?s?1 intruder ground-state configuration.

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

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