Dawning of the N=32 shell closure seen through precision mass measurements of neutron-rich titanium isotopes

E. Leistenschneider, M. P. Reiter, S. Ayet San Andrés, B. Kootte, J. D. Holt, P. Navrátil, C. Babcock, C. Barbieri, B. R. Barquest, J. Bergmann, J. Bollig, T. Brunner, E. Dunling, A. Finlay, H. Geissel, L. Graham, F. Greiner, H. Hergert, C. Hornung, C. JeschR. Klawitter, Y. Lan, D. Lascar, K. G. Leach, W. Lippert, J. E. McKay, S. F. Paul, A. Schwenk, D. Short, J. Simonis, V. Somà, R. Steinbrügge, S. R. Stroberg, R. Thompson, M. E. Wieser, C. Will, M. Yavor, C. Andreoiu, T. Dickel, I. Dillmann, G. Gwinner, W. R. Plaß, C. Scheidenberger, A. A. Kwiatkowski, J. Dilling

Research output: Contribution to journalLetterpeer-review


A precision mass investigation of the neutron-rich titanium isotopes 51−55Ti was performed at TRIUMF’s Ion Trap for Atomic and Nuclear science (TITAN). The range of the measurements covers the N ¼ 32 shell closure, and the overall uncertainties of the 52−55Ti mass values were significantly reduced. Our results
conclusively establish the existence of the weak shell effect at N ¼ 32, narrowing down the abrupt onset of this shell closure. Our data were compared with state-of-the-art ab initio shell model calculations which, despite very successfully describing where the N ¼ 32 shell gap is strong, overpredict its strength and extent in titanium and heavier isotones. These measurements also represent the first scientific results of TITAN using the newly commissioned multiple-reflection time-of-flight mass spectrometer, substantiated
by independent measurements from TITAN’s Penning trap mass spectrometer.
Original languageEnglish
Article number062503
JournalPhysical Review Letters
Issue number6
Publication statusPublished - 9 Feb 2018


  • nucl-ex
  • nucl-th


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