Mass Measurements of Neutron-Deficient Yb Isotopes and Nuclear Structure at the Extreme Proton-Rich Side of the N=82 Shell

Sonke Beck*, Brian Kootte, Irene Dedes, Timo Dickel, A A Kwiatkowski, Eleni Marina Lykiardopoulou, Wolfgang R Plab, M. P. Reiter, Corina Andreoiu, Julian Bergmann, Thomas Brunner, Dominique Curien, Jens Dilling, Jerzy Dudek, Eleanor Dunling, Jake Flowerdew, Abdelghafar Gaamouci, Leigh Graham, Gerald Gwinner, Andrew JacobsRenee Klawitter, Yang Lan, Erich Leistenschneider, Nikolay Minkov, Victor Monier, Ish Mukul, Stefan F Paul, Christoph Scheidenberger, Robert I Thompson, James L Tracy Jr, Michael Vansteenkiste, Hua-Lei Wang, Michael E Wieser, Christian Will, Jie Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

High-accuracy mass measurements of neutron-deficient Yb isotopes have been performed at TRIUMF using TITAN’s multiple-reflection time-of-flight mass spectrometer (MR-TOF-MS). For the first time, an MR-TOF-MS was used on line simultaneously as an isobar separator and as a mass spectrometer, extending the measurements to two isotopes further away from stability than otherwise possible. The ground state masses of 150,153Yb and the excitation energy of 151Ybm were measured for the first time. As a result, the persistence of the N=82 shell with almost unmodified shell gap energies is established up to the proton drip line. Furthermore, the puzzling systematics of the h11/2-excited isomeric states of the N=81 isotones are unraveled using state-of-the-art mean field calculations.
Original languageEnglish
Article number112501
Pages (from-to)1-8
Number of pages8
JournalPhysical Review Letters
Volume127
Issue number11
DOIs
Publication statusPublished - 10 Sep 2021

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