Evolution of the N=50 Shell Gap Energy towards Ni78

J. Hakala, S. Rahaman, V.-V. Elomaa, T. Eronen, U. Hager, A. Jokinen, A. Kankainen, I. D. Moore, H. Penttilä, S. Rinta-Antila, J. Rissanen, A. Saastamoinen, T. Sonoda, C. Weber, and J. Äystö
Phys. Rev. Lett. 101, 052502 – Published 31 July 2008

Abstract

Atomic masses of the neutron-rich isotopes Zn7680, Ga7883, Ge8085, As8187, and Se8489 have been measured with high precision using the Penning trap mass spectrometer JYFLTRAP at the IGISOL facility. The masses of Ga82,83, Ge8385, As8487, and Se89 were measured for the first time. These new data represent a major improvement in the knowledge of the masses in this neutron-rich region. Two-neutron separation energies provide evidence for the reduction of the N=50 shell gap energy towards germanium (Z=32) and a subsequent increase at gallium (Z=31). The data are compared with a number of theoretical models. An indication of the persistent rigidity of the shell gap towards nickel (Z=28) is obtained.

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  • Received 20 March 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.052502

©2008 American Physical Society

Authors & Affiliations

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

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

  • *Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3, Canada
  • Present address: Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, UK
  • Present address: Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium
  • §juha.aysto@phys.jyu.fi

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Vol. 101, Iss. 5 — 1 August 2008

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