Masses of neutron-rich Ni and Cu isotopes and the shell closure at Z = 28 , N = 40

S. Rahaman; J. Hakala; V. -V. Elomaa; T. Eronen; U. Hager; A. Jokinen; A. Kankainen; I. D. Moore; H. Penttilä; S. Rinta-Antila; J. Rissanen; A. Saastamoinen; C. Weber; J. Äystö

doi:10.1140/epja/i2007-10489-y

EPJ

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2019 Impact factor 2.176

Hadrons and Nuclei

Open Access

Eur. Phys. J. A (2007) 34: 5-9
https://doi.org/10.1140/epja/i2007-10489-y

Letter

Masses of neutron-rich Ni and Cu isotopes and the shell closure at Z = 28 , N = 40

S. Rahaman^*, J. Hakala, V. -V. Elomaa, T. Eronen, U. Hager, A. Jokinen, A. Kankainen, I. D. Moore, H. Penttilä, S. Rinta-Antila, J. Rissanen, A. Saastamoinen, C. Weber and J. Äystö

Department of Physics, University of Jyväskylä, P.O. Box 35 (YFL), FIN-40014, Finland

^* e-mail: saidur.rahaman@phys.jyu.fi

Received: 30 August 2007
Accepted: 1 October 2007
Published online: 19 October 2007

Abstract

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, 75}Cu 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