Examining the $N=28$ shell closure through high-precision mass measurements of $^{46\text{--}48}\mathrm{Ar}$

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Examining the $N = 28$ shell closure through high-precision mass measurements of ${}^{46 – 48}{Ar}$

M. Mougeot, D. Atanasov, C. Barbieri, K. Blaum, M. Breitenfeld, A. de Roubin, T. Duguet, S. George, F. Herfurth, A. Herlert, J. D. Holt, J. Karthein, D. Lunney, V. Manea, P. Navrátil, D. Neidherr, M. Rosenbusch, L. Schweikhard, A. Schwenk, V. Somà, A. Welker, F. Wienholtz, R. N. Wolf, and K. Zuber

Phys. Rev. C 102, 014301 – Published 1 July 2020

Abstract

The strength of the $N = 28$ magic number in neutron-rich argon isotopes is examined through high-precision mass measurements of ${}^{46 – 48}{Ar}$ , performed with the ISOLTRAP mass spectrometer at ISOLDE/CERN. The new mass values are up to 90 times more precise than previous measurements. While they suggest the persistence of the $N = 28$ shell closure for argon, we show that this conclusion has to be nuanced in light of the wealth of spectroscopic data and theoretical investigations performed with the SDPF-U phenomenological shell model interaction. Our results are also compared with ab initio calculations using the valence space in-medium similarity renormalization group and the self-consistent Green's function approaches. Both calculations provide a very good account of mass systematics at and around $Z = 18$ and, generally, a consistent description of the physics in this region. This combined analysis indicates that ${}^{46}{Ar}$ is the transition between the closed-shell ${}^{48}{Ca}$ and collective ${}^{44}S$ .

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Received 12 February 2020
Accepted 2 June 2020

DOI:https://doi.org/10.1103/PhysRevC.102.014301

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Binding energy & masses Nuclear forces Nuclear many-body theory Shell model

39 ≤ A ≤ 58 Nuclear binding

Penning traps

Nuclear Physics

Authors & Affiliations

M. Mougeot ^1,*, D. Atanasov ^2,3,†, C. Barbieri ^4,5,6, K. Blaum ², M. Breitenfeld⁷, A. de Roubin^2,‡, T. Duguet^8,9, S. George², F. Herfurth¹⁰, A. Herlert ¹¹, J. D. Holt¹², J. Karthein ^2,7, D. Lunney ¹, V. Manea ^2,7, P. Navrátil ¹², D. Neidherr¹⁰, M. Rosenbusch^13,§, L. Schweikhard¹³, A. Schwenk^14,15,2, V. Somà⁸, A. Welker ^3,7, F. Wienholtz ^13,7,∥, R. N. Wolf^2,16, and K. Zuber ³

¹CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France
²Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
³Technische Universität Dresden, 01069 Dresden, Germany
⁴Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom
⁵Dipartimento di Fisica, Università degli Studi di Milano, Via Celoria 16, I-20133 Milano, Italy
⁶INFN, Sezione di Milano, Via Celoria 16, I-20133 Milano, Italy
⁷CERN, 1211 Geneva, Switzerland
⁸IRFU, CEA, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
⁹KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium
¹⁰GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany
¹¹FAIR GmbH, Planckstraße 1, 64291 Darmstadt, Germany
¹²TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
¹³Universität Greifswald, Institut für Physik, 17487 Greifswald, Germany
¹⁴Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany
¹⁵ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
¹⁶ARC Centre of Excellence for Engineered Quantum Systems, The University of Sydney, NSW 2006, Australia

^*Present address: CERN, 1211 Geneva, Switzerland; maxime. mougeot@cern.ch
^†Present address: KU Leuven, Instituut voor Kern- en Stralingsfysica, 3001 Leuven, Belgium.
^‡Present address: The University of Jyväskylä, Department of Physics, PO Box 35 (YFL), FIN-40014, Finland.
^§Present address: RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
^∥Present address: Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.

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Vol. 102, Iss. 1 — July 2020

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Physical Review C

covering nuclear physics

Examining the $N = 28$ shell closure through high-precision mass measurements of ${}^{46 – 48}{Ar}$

M. Mougeot, D. Atanasov, C. Barbieri, K. Blaum, M. Breitenfeld, A. de Roubin, T. Duguet, S. George, F. Herfurth, A. Herlert, J. D. Holt, J. Karthein, D. Lunney, V. Manea, P. Navrátil, D. Neidherr, M. Rosenbusch, L. Schweikhard, A. Schwenk, V. Somà, A. Welker, F. Wienholtz, R. N. Wolf, and K. Zuber

Phys. Rev. C 102, 014301 – Published 1 July 2020

Abstract

Physics Subject Headings (PhySH)

Authors & Affiliations

Article Text

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Issue

Physical Review C

covering nuclear physics

Examining the N=28 shell closure through high-precision mass measurements of Ar46–48

Phys. Rev. C 102, 014301 – Published 1 July 2020

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Examining the $N = 28$ shell closure through high-precision mass measurements of ${}^{46 – 48}{Ar}$