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. MougeotI. Mukul, T. Murbock, W. S. Porter, M. Reiter, J. Ringuette, J. Dilling, A. A. Kwiatkowski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

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.
Original languageEnglish
Article number137288
Pages (from-to)1-7
Number of pages7
JournalPhysics Letters B
Volume833
Early online date12 Jul 2022
DOIs
Publication statusPublished - 10 Oct 2022

Keywords

  • nucl-ex
  • nucl-th

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