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Rosenbusch M, Ascher P, Atanasov D, et al. Probing the N=32 Shell Closure below the Magic Proton Number Z=20: Mass Measurements of the Exotic Isotopes ^{52,53}K. Phys Rev Lett. 2015;114(20):202501doi: 10.1103/PhysRevLett.114.202501.
Rosenbusch, M., Ascher, P., Atanasov, D., Barbieri, C., Beck, D., Blaum, K., Borgmann, C. h., Breitenfeldt, M., Cakirli, R. B., Cipollone, A., George, S., Herfurth, F., Kowalska, M., Kreim, S., Lunney, D., Manea, V., Navrátil, P., Neidherr, D., Schweikhard, L., Somà, V., Stanja, J., Wienholtz, F., Wolf, R. N., & Zuber, K. (2015). Probing the N=32 Shell Closure below the Magic Proton Number Z=20: Mass Measurements of the Exotic Isotopes ^{52,53}K. Physical review letters, 114(20), 202501. https://doi.org/10.1103/PhysRevLett.114.202501
Rosenbusch, M, et al. "Probing the N=32 Shell Closure below the Magic Proton Number Z=20: Mass Measurements of the Exotic Isotopes ^{52,53}K." Physical review letters vol. 114,20 (2015): 202501. doi: https://doi.org/10.1103/PhysRevLett.114.202501
Rosenbusch M, Ascher P, Atanasov D, Barbieri C, Beck D, Blaum K, Borgmann Ch, Breitenfeldt M, Cakirli RB, Cipollone A, George S, Herfurth F, Kowalska M, Kreim S, Lunney D, Manea V, Navrátil P, Neidherr D, Schweikhard L, Somà V, Stanja J, Wienholtz F, Wolf RN, Zuber K. Probing the N=32 Shell Closure below the Magic Proton Number Z=20: Mass Measurements of the Exotic Isotopes ^{52,53}K. Phys Rev Lett. 2015 May 22;114(20):202501. doi: 10.1103/PhysRevLett.114.202501. Epub 2015 May 20. PMID: 26047224.
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Phys Rev Lett. 2015 May 22;114(20):202501. doi: 10.1103/PhysRevLett.114.202501. Epub 2015 May 20.

Probing the N=32 Shell Closure below the Magic Proton Number Z=20: Mass Measurements of the Exotic Isotopes ^{52,53}K.

Physical review letters

M Rosenbusch, P Ascher, D Atanasov, C Barbieri, D Beck, K Blaum, Ch Borgmann, M Breitenfeldt, R B Cakirli, A Cipollone, S George, F Herfurth, M Kowalska, S Kreim, D Lunney, V Manea, P Navrátil, D Neidherr, L Schweikhard, V Somà, J Stanja, F Wienholtz, R N Wolf, K Zuber

Affiliations

  1. Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald, 17487 Greifswald, Germany.
  2. Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.
  3. Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom.
  4. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstraße 1, 64291 Darmstadt, Germany.
  5. Instituut voor Kern- en Stralingsfysica, KU Leuven, Celestijnenlaan 200d, B-3001 Heverlee, Belgium.
  6. Department of Physics, University of Istanbul, 34134 Istanbul, Turkey.
  7. CERN, 1211 Geneva 23, Switzerland.
  8. CSNSM-IN2P3-CNRS, Université Paris-Sud, 91405 Orsay, France.
  9. TRIUMF, 4004 Westbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
  10. CEA-Saclay, IRFU/Service de Physique Nucléaire, 91191 Gif-sur-Yvette, France.
  11. Institut für Kernphysik, Technische Universität Darmstadt, 64289 Darmstadt, Germany.
  12. ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany.
  13. Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany.

PMID: 26047224 DOI: 10.1103/PhysRevLett.114.202501

Abstract

The recently confirmed neutron-shell closure at N=32 has been investigated for the first time below the magic proton number Z=20 with mass measurements of the exotic isotopes (52,53)K, the latter being the shortest-lived nuclide investigated at the online mass spectrometer ISOLTRAP. The resulting two-neutron separation energies reveal a 3 MeV shell gap at N=32, slightly lower than for 52Ca, highlighting the doubly magic nature of this nuclide. Skyrme-Hartree-Fock-Bogoliubov and ab initio Gorkov-Green function calculations are challenged by the new measurements but reproduce qualitatively the observed shell effect.

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