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. Jesch; R. 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

doi:10.1103/PhysRevLett.120.062503

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

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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.

Original language	English
Article number	062503
Journal	Physical Review Letters
Volume	120
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevLett.120.062503
State	Published - Feb 9 2018
Externally published	Yes

Funding

The authors want to thank the TRILIS group at TRIUMF for Ti beam development, C. Lotze, T. Wasem, R. Weiß, and the staff of the machine shop of the physics institutes of the JLU Gießen for excellent technical support. This work was partially supported by Canadian agencies NSERC and CFI, U.S.A. NSF (Grants No. PHY-1419765 and No. PHY-1614130) and DOE (Grant No. DE-SC0017649), Brazil’s CNPq (Grant No. 249121/2013-1), United Kingdom’s STFC (Grants No. ST/L005743/1 and No. ST/P005314/1), German institutions DFG (Grants No. FR 601/3-1 and No. SFB1245 and through PRISMA Cluster of Excellence), BMBF (Grants No. 05P15RDFN1 and No. 05P12RGFN8), the Helmholtz Association through NAVI (Grant No. VH-VI-417), HMWK through the LOEWE Center HICforFAIR, and the JLU-GSI partnership. Computations were performed with resources of the Jülich Supercomputing Center (JURECA), GENCI-TGCC (Grant No. 2017-0507392), MSUs iCER and UKs DiRAC Complexity system (Grants No. ST/K000373/1 and No. ST/K0003259/1). TRIUMF receives federal funding via NRC.

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10.1103/PhysRevLett.120.062503

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Leistenschneider, E., Reiter, M. P., Ayet San Andrés, S., Kootte, B., Holt, J. D., Navrátil, P., Babcock, C., Barbieri, C., Barquest, B. R., Bergmann, J., Bollig, J., Brunner, T., Dunling, E., Finlay, A., Geissel, H., Graham, L., Greiner, F., Hergert, H., Hornung, C., ... 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), Article 062503. https://doi.org/10.1103/PhysRevLett.120.062503

@article{c61a53678f2141be8ee36015e66ebf8e,

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.",

author = "E. Leistenschneider and Reiter, {M. P.} and {Ayet San Andr{\'e}s}, S. and B. Kootte and Holt, {J. D.} and P. Navr{\'a}til and C. Babcock and C. Barbieri and Barquest, {B. R.} and J. Bergmann and J. Bollig and T. Brunner and E. Dunling and A. Finlay and H. Geissel and L. Graham and F. Greiner and H. Hergert and C. Hornung and C. Jesch and R. Klawitter and Y. Lan and D. Lascar and Leach, {K. G.} and W. Lippert and McKay, {J. E.} and Paul, {S. F.} and A. Schwenk and D. Short and J. Simonis and V. Som{\`a} and R. Steinbr{\"u}gge and Stroberg, {S. R.} and R. Thompson and Wieser, {M. E.} and C. Will and M. Yavor and C. Andreoiu and T. Dickel and I. Dillmann and G. Gwinner and Pla{\ss}, {W. R.} and C. Scheidenberger and Kwiatkowski, {A. A.} and J. Dilling",

note = "Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

month = feb,

day = "9",

doi = "10.1103/PhysRevLett.120.062503",

language = "English",

volume = "120",

journal = "Physical Review Letters",

issn = "0031-9007",

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Leistenschneider, E, Reiter, MP, Ayet San Andrés, S, Kootte, B, Holt, JD, Navrátil, 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, Somà, V, Steinbrügge, 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 2018, 'Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes', Physical Review Letters, vol. 120, no. 6, 062503. https://doi.org/10.1103/PhysRevLett.120.062503

TY - JOUR

T1 - Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

AU - Leistenschneider, E.

AU - Reiter, M. P.

AU - Ayet San Andrés, S.

AU - Kootte, B.

AU - Holt, J. D.

AU - Navrátil, P.

AU - Babcock, C.

AU - Barbieri, C.

AU - Barquest, B. R.

AU - Bergmann, J.

AU - Bollig, J.

AU - Brunner, T.

AU - Dunling, E.

AU - Finlay, A.

AU - Geissel, H.

AU - Graham, L.

AU - Greiner, F.

AU - Hergert, H.

AU - Hornung, C.

AU - Jesch, C.

AU - Klawitter, R.

AU - Lan, Y.

AU - Lascar, D.

AU - Leach, K. G.

AU - Lippert, W.

AU - McKay, J. E.

AU - Paul, S. F.

AU - Schwenk, A.

AU - Short, D.

AU - Simonis, J.

AU - Somà, V.

AU - Steinbrügge, R.

AU - Stroberg, S. R.

AU - Thompson, R.

AU - Wieser, M. E.

AU - Will, C.

AU - Yavor, M.

AU - Andreoiu, C.

AU - Dickel, T.

AU - Dillmann, I.

AU - Gwinner, G.

AU - Plaß, W. R.

AU - Scheidenberger, C.

AU - Kwiatkowski, A. A.

AU - Dilling, J.

PY - 2018/2/9

Y1 - 2018/2/9

N2 - 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.

AB - 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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DO - 10.1103/PhysRevLett.120.062503

M3 - Article

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SN - 0031-9007

VL - 120

JO - Physical Review Letters

JF - Physical Review Letters

IS - 6

M1 - 062503

ER -

Dawning of the N=32 Shell Closure Seen through Precision Mass Measurements of Neutron-Rich Titanium Isotopes

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