Physics Letters B (Oct 2022)
Summit of the N=40 island of inversion: Precision mass measurements and ab initio calculations of neutron-rich chromium isotopes
- R. Silwal,
- C. Andreoiu,
- B. Ashrafkhani,
- J. Bergmann,
- T. Brunner,
- J. Cardona,
- K. Dietrich,
- E. Dunling,
- G. Gwinner,
- Z. Hockenbery,
- J.D. Holt,
- C. Izzo,
- A. Jacobs,
- A. Javaji,
- B. Kootte,
- Y. Lan,
- D. Lunney,
- E.M. Lykiardopoulou,
- T. Miyagi,
- M. Mougeot,
- I. Mukul,
- T. Murböck,
- W.S. Porter,
- M. Reiter,
- J. Ringuette,
- J. Dilling,
- A.A. Kwiatkowski
Affiliations
- R. Silwal
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, Appalachian State University, Boone, NC 28608, USA; Corresponding author.
- C. Andreoiu
- Department of Chemistry, Simon Fraser University, Burnaby, BC V5A1S6, Canada
- B. Ashrafkhani
- Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4, Canada
- J. Bergmann
- Physikalisches Institut, Justus-Liebig-Universiteät, Gießen 35392, Germany
- T. Brunner
- Department of Physics, Mcgill University, Montreal, QC H3A0G4, Canada
- J. Cardona
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- K. Dietrich
- TRIUMF, Vancouver, BC V6T2A3, Canada; University of Heidelberg, Philosophenweg 12, Heidelberg 69120, Germany
- E. Dunling
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics, University of York, York YO10 5DD, UK
- G. Gwinner
- Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Z. Hockenbery
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics, Mcgill University, Montreal, QC H3A0G4, Canada
- J.D. Holt
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics, Mcgill University, Montreal, QC H3A0G4, Canada
- C. Izzo
- TRIUMF, Vancouver, BC V6T2A3, Canada
- A. Jacobs
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- A. Javaji
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- B. Kootte
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Y. Lan
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- D. Lunney
- Université Paris-Saclay, IJCLab-IN2P3/CNRS, France
- E.M. Lykiardopoulou
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- T. Miyagi
- TRIUMF, Vancouver, BC V6T2A3, Canada; Technische Universität Darmstadt, Department of Physics, Darmstadt 64289, Germany; ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt 64291, Germany
- M. Mougeot
- CERN, 1211 Geneva 23, Switzerland; Max-Planck-Institut für Kernphysik, Heidelberg 69117, Germany
- I. Mukul
- TRIUMF, Vancouver, BC V6T2A3, Canada
- T. Murböck
- TRIUMF, Vancouver, BC V6T2A3, Canada
- W.S. Porter
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- M. Reiter
- School of Physics and Astronomy, University of Edinburgh, Edinburgh EH8 9YL, UK
- J. Ringuette
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics, Colorado School of Mines, Golden, CO 80401, USA
- J. Dilling
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
- A.A. Kwiatkowski
- TRIUMF, Vancouver, BC V6T2A3, Canada; Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P 5C2, Canada
- Journal volume & issue
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Vol. 833
p. 137288
Abstract
Mass measurements continue to provide invaluable information for elucidating nuclear structure and scenarios of astrophysical interest. The transition region between the Z=20 and 28 proton shell closures is particularly interesting due to the onset and evolution of nuclear deformation as nuclei become more neutron-rich. This provides a critical testing ground for emerging ab-initio nuclear structure models. Here, we present high-precision mass measurements of neutron-rich chromium isotopes using the sensitive electrostatic Multiple-Reflection Time-Of-Flight Mass Spectrometer (MR-TOF-MS) at TRIUMF's Ion Trap for Atomic and Nuclear Science (TITAN) facility. Our high-precision mass measurements of 59,61−63Cr confirm previous results, and the improved precision in measurements of 64−65Cr refine the mass surface beyond N=40. With the ab initio in-medium similarity renormalization group, we examine the trends in collectivity in chromium isotopes and give a complete picture of the N=40 island of inversion from calcium to nickel.
