Competition between pairing correlations and deformation from the odd-even mass 
staggering of francium and radium isotopes

Kreim, Susanne; Beck, D.; Blaum, Klaus; Borgmann, Christopher; Breitenfeldt, M.; Cocolios, T.E.; Gottberg, A.; Herfurth, F.; Kowalska, M.; Litvinov, Yu.A.; Lunney, D.; Manea, V.; Mendonca, T.M.; Naimi, S.; Neidherr, D.; Rosenbusch, M.; Schweikhard, L.; Stora, Th.; Wienholtz, F.; Wolf, R.N.; Zuber, K.

doi:10.1103/PhysRevC.90.024301

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Competition between pairing correlations and deformation from the odd-even mass staggering of francium and radium isotopes

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Kreim, Susanne
CERN;
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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http://link.aps.org/doi/10.1103/PhysRevC.90.024301
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Citation

Kreim, S., Beck, D., Blaum, K., Borgmann, C., Breitenfeldt, M., Cocolios, T., et al. (2014). Competition between pairing correlations and deformation from the odd-even mass staggering of francium and radium isotopes. Physical Review C, 90(2): 024301. doi:10.1103/PhysRevC.90.024301.

Cite as: https://hdl.handle.net/11858/00-001M-0000-001A-22B9-B

Abstract

The masses of ^{222,224,226–233}Fr and ^233,234Ra have been determined with the Penning-trap mass spectrometer ISOLTRAP at the ISOLDE facility at CERN, including the previously unknown mass and half-life of ²³³Fr. We study the evolution of the odd-even staggering of binding energies along the francium and radium isotopic chains and of its lowest-order estimator, Δ³(N). An enhancement of the staggering of Δ³(N) is observed towards neutron number N=146, which points to contributions beyond pairing correlations. These contributions are investigated in the Hartree-Fock and Hartree-Fock-Bogoliubov approaches, emphasizing the connections to the single-particle level density and nuclear deformation.