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

B. Cheal E. Mané J. Billowes M. L. Bissell K. Blaum B. A. Brown F. C. Charlwood K.T. Flanagan 1 D. H. Forest C. Geppert M. Honma A. Jokinen M. Kowalska A. Krieger J. Krämer I. D. Moore R. Neugart G. Neyens W. Nörtershäuser M. Schug H. H. Stroke P. Vingerhoets D. T. Yordanov M. Žáková
1 IPNO - Institut de Physique Nucléaire d'Orsay
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 : Tuesday, December 1, 2020 - 6:42:04 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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