Laser Spectroscopy of Neutron-Rich Tin Isotopes: A Discontinuity in Charge 
Radii across the N = 82 Shell Closure

Gorges, C.; Rodríguez, L. V.; Balabanski, D. L.; Bissell, M. L.; Blaum, Klaus; Cheal, B.; Ruiz, R. F. Garcia; Georgiev, G.; Gins, W.; Heylen, Hanne; Kanellakopoulos, A.; Kaufmann, S.; Kowalska, M.; Lagaki, V.; Lechner, S.; Maaß, B.; Malbrunot-Ettenauer, S.; Nazarewicz, W.; Neugart, Rainer; Neyens, G.; Nörtershäuser, W.; Reinhard, P.-G.; Sailer, S.; Sánchez, R.; Schmidt, S.; Wehner, L.; Wraith, C.; Xie, L.; Xu, Z. Y.; Yang, X. F.; Yordanov, D. T.

doi:10.1103/PhysRevLett.122.192502

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Laser Spectroscopy of Neutron-Rich Tin Isotopes: A Discontinuity in Charge Radii across the N = 82 Shell Closure

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Blaum, Klaus
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Heylen, Hanne
1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany 2Institut de Physique Nucl´eaire, CNRS-IN2P3, Universit´e Paris-Sud, Universit´e Paris-Saclay, 91406 Orsay, France 3ELI-NP, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 077125 Magurele, Romania 4School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom 6Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool L69 7ZE, United Kingdom 7Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium 8Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland 9Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany 10Technische Universität Wien, Karlsplatz 13, 1040 Wien, Austria 11Department of Physics and Astronomy and FRIB Laboratory, Michigan State University, East Lansing, Michigan 48824, USA 12Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany 13Institut für Theoretische Physik II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany 14Technische Universität München, D-80333 Munich, Germany 15GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany 16School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China ;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Neugart, Rainer
1Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany 2Institut de Physique Nucl´eaire, CNRS-IN2P3, Universit´e Paris-Sud, Universit´e Paris-Saclay, 91406 Orsay, France 3ELI-NP, Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, 077125 Magurele, Romania 4School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom 6Oliver Lodge Laboratory, Oxford Street, University of Liverpool, Liverpool L69 7ZE, United Kingdom 7Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium 8Experimental Physics Department, CERN, CH-1211 Geneva 23, Switzerland 9Institut für Physik, Universität Greifswald, 17487 Greifswald, Germany 10Technische Universität Wien, Karlsplatz 13, 1040 Wien, Austria 11Department of Physics and Astronomy and FRIB Laboratory, Michigan State University, East Lansing, Michigan 48824, USA 12Institut für Kernchemie, Universität Mainz, D-55128 Mainz, Germany 13Institut für Theoretische Physik II, Universität Erlangen-Nürnberg, 91058 Erlangen, Germany 14Technische Universität München, D-80333 Munich, Germany 15GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany 16School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China ;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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Citation

Gorges, C., Rodríguez, L. V., Balabanski, D. L., Bissell, M. L., Blaum, K., Cheal, B., et al. (2019). Laser Spectroscopy of Neutron-Rich Tin Isotopes: A Discontinuity in Charge Radii across the N = 82 Shell Closure. Physical Review Letters, 122(19): 192502. doi:10.1103/PhysRevLett.122.192502.

Cite as: https://hdl.handle.net/21.11116/0000-0003-CBA7-C

Abstract

The change in mean-square nuclear charge radii δ⟨r²⟩ along the even-A tin isotopic chain ^108−134Sn has been investigated by means of collinear laser spectroscopy at ISOLDE/CERN using the atomic transitions 5p² ¹S₀ → 5p6 s¹P₁ and 5p^2 3P₀→5p6s ³P₁. With the determination of the charge radius of 134Sn and corrected values for some of the neutron-rich isotopes, the evolution of the charge radii across the N=82 shell closure is established. A clear kink at the doubly magic ¹³²Sn is revealed, similar to what has been observed at N=82 in other isotopic chains with larger proton numbers, and at the N=126 shell closure in doubly magic ²⁰⁸Pb. While most standard nuclear density functional calculations struggle with a consistent explanation of these discontinuities, we demonstrate that a recently developed Fayans energy density functional provides a coherent description of the kinks at both doubly magic nuclei, ¹³²Sn and ²⁰⁸Pb, without sacrificing the overall performance. A multiple correlation analysis leads to the conclusion that both kinks are related to pairing and surface effects.