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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 and Dilling, J (2018) Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes Physical Review Letters, 120 (6), 062503.

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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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
Leistenschneider, E
Reiter, M
Ayet San Andrés, S
Kootte, B
Holt, J
Navrátil, P
Babcock, C
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
Date : 9 February 2018
Funders : STFC
DOI : 10.1103/PhysRevLett.120.062503
Copyright Disclaimer : Copyright 2018 American Physical Society
Depositing User : Melanie Hughes
Date Deposited : 08 May 2018 11:57
Last Modified : 11 Dec 2018 11:24

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