Masses of neutron-rich Ni and Cu isotopes and the shell closure at Z = 28 , N = 40
Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014, Finland
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Accepted: 1 October 2007
Published online: 19 October 2007
The Penning trap mass spectrometer JYFLTRAP, coupled to the Ion Guide Isotope Separator On-Line (IGISOL) facility at Jyväskylä, was employed to measure the atomic masses of neutron-rich 70-73Ni and 73, 75Cu isotopes with a typical accuracy less than 5keV. The mass of 73Ni was measured for the first time. Comparisons with the previous data are discussed. Two-neutron separation energies show a weak subshell closure at 68 28Ni40 . A well established proton shell gap is observed at Z = 28 .
PACS: 21.10.Dr Binding energies and masses – / 27.50.+e 59 ⩽ A ⩽ 89 – / 27.60.+j 90 ⩽ A ⩽ 149 – / 07.75.+h Mass spectrometers –
© Società Italiana di Fisica and Springer-Verlag, 2007