Dawning of the N = 32 shell closure seen through precision mass measurements of neutron-rich titanium isotopes
2017
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 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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