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Mapping the N=40 island of inversion: Precision mass measurements of neutron-rich Fe isotopes

W. S. Porter1,2,*, B. Ashrafkhani3, J. Bergmann4, C. Brown5, T. Brunner1,6, J. D. Cardona1,7, D. Curien8, I. Dedes9, T. Dickel4,10 et al.

J. Dudek8,11, E. Dunling1,12, G. Gwinner7, Z. Hockenbery1,6, J. D. Holt1,13, C. Hornung10, C. Izzo1, A. Jacobs1,2, A. Javaji1,2, B. Kootte1,7, G. Kripkó-Koncz4, E. M. Lykiardopoulou1,2, T. Miyagi1, I. Mukul1, T. Murböck1, W. R. Plaß4,10, M. P. Reiter1,4,5, J. Ringuette1,14, C. Scheidenberger4,10,15, R. Silwal1,†, C. Walls1,7, H. L. Wang16, Y. Wang1,2, J. Yang11,16, J. Dilling1,2, and A. A. Kwiatkowski1,17

  • 1TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
  • 2Department of Physics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
  • 3Department of Physics & Astronomy, University of Calgary, Calgary, Alberta T2N 1N4, Canada
  • 4II. Physikalisches Institut, Justus-Liebig-Universität, 35392 Gießen, Germany
  • 5School of Physics and Astronomy, University of Edinburgh, Edinburgh, EH9 3FD, United Kingdom
  • 6Department of Physics, McGill University, 3600 Rue University, Montréal, QC H3A 2T8, Canada
  • 7Department of Physics & Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
  • 8Université de Strasbourg, CNRS, IPHC UMR 7178, F-67 037 Strasbourg, France
  • 9Institute of Nuclear Physics, Polish Academy of Sciences, PL-31 342 Kraków, Poland
  • 10GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
  • 11Institute of Physics, Marie Curie-Skłodowska University, PL-20 031 Lublin, Poland
  • 12Department of Physics, University of York, York, YO10 5DD, United Kingdom
  • 13Department of Physics, McGill University, Montréal, QC H3A 2T8, Canada
  • 14Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
  • 15Helmholtz Forschungsakademie Hessen für FAIR (HFHF), GSI Helmholtzzentrum für Schwerionenforschung, Campus Gießen, 35392 Gießen, Germany
  • 16School of Physics and Microelectronics, Zhengzhou University, Zhengzhou 4500001, China
  • 17Department of Physics and Astronomy, University of Victoria, Victoria, British Columbia V8P 5C2, Canada

  • *wporter@triumf.ca
  • †Present address: Department of Physics and Astronomy, Appalachian State University, Boone, North Carolina 28608, USA.
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Phys. Rev. C 105, L041301 – Published 19 April, 2022

DOI: https://doi.org/10.1103/PhysRevC.105.L041301

Abstract

Nuclear properties across the chart of nuclides are key to improving and validating our understanding of the strong interaction in nuclear physics. We present high-precision mass measurements of neutron-rich Fe isotopes performed at the TITAN facility. The multiple-reflection time-of-flight mass spectrometer (MR-ToF-MS), achieving a resolving power greater than 600000 for the first time, enabled the measurement of Fe63–70, including first-time high-precision direct measurements (δm/m≈10−7) of Fe68–70, as well as the discovery of a long-lived isomeric state in Fe69. These measurements are accompanied by both mean-field and ab initio calculations using the most recent realizations which enable theoretical assignment of the spin-parities of the Fe69 ground and isomeric states. Together with mean-field calculations of quadrupole deformation parameters for the Fe isotope chain, these results benchmark a maximum of deformation in the N=40 island of inversion in Fe and shed light on trends in level densities indicated in the newly refined mass surface.

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Phys. Rev. C 105, L041301– Published 19 April, 2022
  • Received 19 July 2021
  • Revised 24 December 2021
  • Accepted 16 March 2022
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