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

Abstract : 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 73Ga, being near degenerate with a 3/2- isomer (75  eV≲Eex≲1  keV). The 79Ga g.s., with I=3/2, is dominated by protons in the πf5/2 orbital and in 81Ga the 5/2- level becomes the g.s. The data are compared to shell-model calculations in the f5/2pg9/2 model space, calling for further theoretical developments and new experiments.
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Submitted on : Thursday, July 22, 2010 - 2:21:05 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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B. Cheal, E. Mané, J. Billowes, M. L. Bissell, K. Blaum, et al.. Nuclear Spins and Moments of Ga Isotopes Reveal Sudden Structural Changes between N=40 and N=50. Physical Review Letters, American Physical Society, 2010, 104, pp.252502. ⟨10.1103/PhysRevLett.104.252502⟩. ⟨in2p3-00505054⟩

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