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

W. S. Porter*, B. Ashrafkhani, J. Bergmann, C. Brown, T. Brunner, J. D. Cardona, D. Curien, I. Dedes, T. Dickel, J. Dudek, E. Dunling, G. Gwinner, Z. Hockenbery, J. D. Holt, C. Hornung, C. Izzo, A. Jacobs, A. Javaji, B. Kootte, G. Kripkó-KonczE. M. Lykiardopoulou, T. Miyagi, I. Mukul, T. Murböck, W. R. Plaß, M. P. Reiter, J. Ringuette, C. Scheidenberger, R. Silwal, C. Walls, H. L. Wang, Y. Wang, J. Yang, J. Dilling, A. A. Kwiatkowski

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review

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 63–70Fe, including first-time high-precision direct measurements (δm/m≈10−7) of 68–70Fe, as well as the discovery of a long-lived isomeric state in 69Fe. 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 69Fe 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.
Original languageEnglish
Article numberL041301
Pages (from-to)1-8
Number of pages8
JournalPhysical Review C
Volume105
Issue number4
DOIs
Publication statusPublished - 19 Apr 2022

Keywords

  • nucl-ex
  • nucl-th

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