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High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure at N=40

Abstract : High-precision mass measurements of more than thirty neutron-rich nuclides around the Z=28 closed proton shell were performed with the triple-trap mass spectrometer ISOLTRAP at ISOLDE/CERN to address the question of a possible neutron shell closure at N=40. The results, for 57,60,64-69Ni (Z=28), 65-74,76Cu (Z=29), and 63-65,68-78Ga (Z=31), have a relative uncertainty of the order of 10^8. In particular, the masses of 72-74,76Cu have been measured for the first time. We analyse the resulting mass surface for signs of magicity, comparing the behavior of N=40 to that of known magic numbers and to mid-shell behavior. Contrary to nuclear spectroscopy studies, no indications of a shell or sub-shell closure are found for N=40.
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http://hal.in2p3.fr/in2p3-00134952
Contributor : Suzanne Robert <>
Submitted on : Tuesday, March 6, 2007 - 9:36:31 AM
Last modification on : Wednesday, October 14, 2020 - 4:11:12 AM

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C. Guenaut, G. Audi, D. Beck, K. Blaum, G. Bollen, et al.. High-precision mass measurements of nickel, copper, and gallium isotopes and the purported shell closure at N=40. Physical Review C, American Physical Society, 2007, 75, pp.044303. ⟨10.1103/PhysRevC.75.044303⟩. ⟨in2p3-00134952⟩

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