Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes
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| Authors: | Leistenschneider, E; Reiter, MP; San Andres, SA; Kootte, B; Holt, JD; Navratil, P; Babcock, C; Barbieri, C; Barquest, BR; Bergmann, J; Bollig, J; Brunner, T; Dunling, E; Finlay, A; Geissel, H; Graham, L; Greiner, F; Hergert, H; Hornung, C; Jesch, C; Klawitter, R; Lan, Y; Lascar, D; Leach, KG; Lippert, W; McKay, JE; Paul, SF; Schwenk, A; Short, D; Simonis, J; Soma, V; Steinbrugge, R; Stroberg, SR; Thompson, R; Wieser, ME; Will, C; Yavor, M; Andreoiu, C; Dickel, T; Dillmann, I; Gwinner, G; Plass, WR; Scheidenberger, C; Kwiatkowski, AA; Dilling, J |
| Year: | 2018 |
| Journal: | Phys. Rev. Lett. 120 Article Link (DOI) PubMed |
| Title: | Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes |
| Abstract: | A precision mass investigation of the neutron-rich titanium isotopes Ti51-55 was performed at TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN). The range of the measurements covers the N = 32 shell closure, and the overall uncertainties of the Ti52-55 mass values were significantly reduced. Our results conclusively establish the existence of the weak shell effect at N = 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 = 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. |
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