Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes
- Leistenschneider, E
- Reiter, M
- Ayet San Andrés, S
- Kootte, B
- Holt, J
- Navrátil, P
- Babcock, C
- Barbieri, Carlo
- Barquest, B
- 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, K
- Lippert, W
- McKay, J
- Paul, S
- Schwenk, A
- Short, D
- Simonis, J
- Somà, V
- Steinbrügge, R
- Stroberg, S
- Thompson, R
- Wieser, M
- Will, C
- Yavor, M
- Andreoiu, C
- Dickel, T
- Dillmann, I
- Gwinner, G
- Plaß, W
- Scheidenberger, C
- Kwiatkowski, A
- Dilling, J
DOIAbstract
A precision mass investigation of the neutron-rich titanium isotopes 51 − 55 Ti 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 52 − 55 Ti 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 fi...
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