Probing the N = 32 Shell Closure below the Magic Proton Number Z = 20: Mass 
Measurements of the Exotic Isotopes52,53K

Rosenbusch, M.; Ascher, Pauline; Atanasov, Dinko; Barbieri, C.; Beck, D.; Blaum, Klaus; Borgmann, Christopher; Breitenfeldt, M.; Cakirli, R. Burcu; Cipollone, A.; George, Sebastian; Herfurth, F.; Kowalska, M.; Kreim, Susanne Waltraud; Lunney, D.; Manea, V.; Navrátil, P.; Neidherr, D.; Schweikhard, L.; Somà, V.; Stanja, J.; Wienholtz, F.; Wolf, Robert; Zuber, K.

doi:10.1103/PhysRevLett.114.202501

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

MPS-Authors

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

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

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

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

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Cakirli, R. Burcu
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
Department of Physics, University of Istanbul;

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

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Kreim, Susanne Waltraud
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;
CERN;

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Wolf, Robert
Institut für Physik, Ernst-Moritz-Arndt Universität Greifswald;
Division Prof. Dr. Klaus Blaum, MPI for Nuclear Physics, Max Planck Society;

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http://link.aps.org/doi/10.1103/PhysRevLett.114.202501
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1506.00520
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Citation

Rosenbusch, M., Ascher, P., Atanasov, D., Barbieri, C., Beck, D., Blaum, K., et al. (2015). Probing the N = 32 Shell Closure below the Magic Proton Number Z = 20: Mass Measurements of the Exotic Isotopes ^52,53K. Physical Review Letters, 114(20): 202501. doi:10.1103/PhysRevLett.114.202501.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0027-A2B2-C

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 K^52,53, 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 Ca⁵², 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.