Spins and Magnetic Moments of K49 and K51: Establishing the 1/2+ and 3/2+ Level Ordering Beyond N=28

J. Papuga, M. L. Bissell, K. Kreim, K. Blaum, B. A. Brown, M. De Rydt, R. F. Garcia Ruiz, H. Heylen, M. Kowalska, R. Neugart, G. Neyens, W. Nörtershäuser, T. Otsuka, M. M. Rajabali, R. Sánchez, Y. Utsuno, and D. T. Yordanov
Phys. Rev. Lett. 110, 172503 – Published 23 April 2013

Abstract

The ground-state spins and magnetic moments of K49,51 have been measured using bunched-beam high-resolution collinear laser spectroscopy at ISOLDE CERN. For K49 a ground-state spin I=1/2 was firmly established. The observed hyperfine structure of K51 requires a spin I>1/2 and strongly suggests I=3/2. From its magnetic moment μ(K51)=+0.5129(22)μN a spin-parity Iπ=3/2+ with a dominant π1d3/21 hole configuration was deduced. This establishes for the first time the reinversion of the single-particle levels and illustrates the prominent role of the residual monopole interaction for single-particle levels and shell evolution.

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  • Received 14 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.110.172503

© 2013 American Physical Society

Authors & Affiliations

J. Papuga1,*, M. L. Bissell1, K. Kreim2, K. Blaum2, B. A. Brown3, M. De Rydt1, R. F. Garcia Ruiz1, H. Heylen1, M. Kowalska4, R. Neugart5, G. Neyens1, W. Nörtershäuser5,6, T. Otsuka7, M. M. Rajabali1, R. Sánchez8, Y. Utsuno9, and D. T. Yordanov2

  • 1Instituut voor Kern-en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium
  • 2Max-Plank-Institut für Kernphysik, D-69117 Heidelberg, Germany
  • 3Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 4Physics Department, CERN, CH-1211 Geneva 23, Switzerland
  • 5Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany
  • 6Institut für Kernphysik, TU Darmstadt, D-64289 Darmstadt, Germany
  • 7Department of Physics and Center for Nuclear Study, University of Tokyo, Hongo, Tokyo 113-0033, Japan and RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan
  • 8GSI Helmholtzzentrum für Schwerionenforschung, D-64291 Darmstadt, Germany
  • 9Japan Atomic Energy Agency, Tokai-mura, Ibaraki 319-1195, Japan

  • *jasna.papuga@fys.kuleuven.be

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Vol. 110, Iss. 17 — 26 April 2013

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