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Isomeric Excitation Energy for In99m from Mass Spectrometry Reveals Constant Trend Next to Doubly Magic Sn100

L. Nies1,2,*, D. Atanasov1,†, M. Athanasakis-Kaklamanakis1,3, M. Au1,4, K. Blaum5, J. Dobaczewski6,7, B. S. Hu8, J. D. Holt8,9, J. Karthein10 et al.

I. Kulikov11, Yu. A. Litvinov11,12, D. Lunney13, V. Manea13, T. Miyagi14,12,5, M. Mougeot1,5,‡, L. Schweikhard2, A. Schwenk14,12,5, K. Sieja15, and F. Wienholtz14

  • 1European Organization for Nuclear Research (CERN), 1211 Geneva 23, Switzerland
  • 2Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany
  • 3KU Leuven, Instituut voor Kern- en Stralingsfysica, B-3001 Leuven, Belgium
  • 4Johannes Gutenberg-Universität Mainz, 55128 Mainz, Germany
  • 5Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
  • 6School of Physics, Engineering and Technology, University of York, Heslington, York YO10 5DD, United Kingdom
  • 7Institute of Theoretical Physics, Faculty of Physics, University of Warsaw, Warsaw, ul. Pasteura 5, PL-02-093 Warsaw, Poland
  • 8TRIUMF, TRIUMF 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 9Department of Physics, McGill University, Montréal, Quebec H3A 2T8, Canada
  • 10Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 11GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 12ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
  • 13Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
  • 14Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
  • 15IPHC, CNRS/IN2P3 et Université de Strasbourg, F-67037 Strasbourg, France

  • *Lukas.Nies@cern.ch
  • †Present address: LP2i Bordeaux, UMR5797, Université de Bordeaux, CNRS, France.
  • ‡Present address: University of Jyväskylä, Department of Physics, Accelerator laboratory, P.O. Box 35(YFL), FI-40014, Finland.
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Phys. Rev. Lett. 131, 022502 – Published 14 July, 2023

DOI: https://doi.org/10.1103/PhysRevLett.131.022502

Abstract

The excitation energy of the 1/2− isomer in In99 at N=50 is measured to be 671(37) keV and the mass uncertainty of the 9/2+ ground state is significantly reduced using the ISOLTRAP mass spectrometer at ISOLDE/CERN. The measurements exploit a major improvement in the resolution of the multireflection time-of-flight mass spectrometer. The results reveal an intriguing constancy of the 1/2− isomer excitation energies in neutron-deficient indium that persists down to the N=50 shell closure, even when all neutrons are removed from the valence shell. This trend is used to test large-scale shell model, ab initio, and density functional theory calculations. The models have difficulties describing both the isomer excitation energies and ground-state electromagnetic moments along the indium chain.

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Phys. Rev. Lett. 131, 022502– Published 14 July, 2023
  • Received 2 February 2023
  • Revised 10 April 2023
  • Accepted 2 June 2023
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