Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between N=40 and N=50

作者：Cheal B^*; Mane E; Billowes J; Bissell M L; Blaum K; Brown B A; Charlwood F C; Flanagan K T; Forest D H; Geppert C; Honma M; Jokinen A; Kowalska M; Krieger A; Kraemer J; Moore I D; Neugart R; Neyens G; Noertershaeuser W; Schug M; Stroke H H; Vingerhoets P; Yordanov D T; Zakova M

来源：Physical Review Letters, 2010, 104(25): 252502.

DOI：10.1103/PhysRevLett.104.252502

Collinear laser spectroscopy was performed on Ga (Z = 31) isotopes at ISOLDE, CERN. A gas-filled linear Paul trap (ISCOOL) was used to extend measurements towards very neutron-rich isotopes (N = 36-50). A ground state (g.s.) spin I = 1/2 is measured for (73)Ga, being near degenerate with a 3/2(-) isomer (75 eV less than or similar to E(ex) less than or similar to 1 keV). The (79)Ga g.s., with I = 3/2, is dominated by protons in the pi f(5/2) orbital and in (81)Ga the 5/2(-) level becomes the g.s. The data are compared to shell-model calculations in the f(5/2)pg(9/2) model space, calling for further theoretical developments and new experiments.

• 出版日期2010-6-23