Precision Mass Measurements beyond Sn132: Anomalous Behavior of Odd-Even Staggering of Binding Energies

J. Hakala, J. Dobaczewski, D. Gorelov, T. Eronen, A. Jokinen, A. Kankainen, V. S. Kolhinen, M. Kortelainen, I. D. Moore, H. Penttilä, S. Rinta-Antila, J. Rissanen, A. Saastamoinen, V. Sonnenschein, and J. Äystö
Phys. Rev. Lett. 109, 032501 – Published 16 July 2012

Abstract

Atomic masses of the neutron-rich isotopes Cd121128, In129,131, Sn130135, Sb131136, and Te132140 have been measured with high precision (10 ppb) using the Penning-trap mass spectrometer JYFLTRAP. Among these, the masses of four r-process nuclei Sn135, Sb136, and Te139,140 were measured for the first time. An empirical neutron pairing gap expressed as the odd-even staggering of isotopic masses shows a strong quenching across N=82 for Sn, with a Z dependence that is unexplainable by the current theoretical models.

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  • Received 5 March 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.032501

© 2012 American Physical Society

Authors & Affiliations

J. Hakala*, J. Dobaczewski, D. Gorelov, T. Eronen, A. Jokinen, A. Kankainen, V. S. Kolhinen, M. Kortelainen, I. D. Moore, H. Penttilä, S. Rinta-Antila, J. Rissanen, A. Saastamoinen, V. Sonnenschein, and J. Äystö

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

  • *jani.hakala@phys.jyu.fi
  • Present address: Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
  • juha.aysto@phys.jyu.fi

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Vol. 109, Iss. 3 — 20 July 2012

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