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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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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: http://hdl.handle.net/11858/00-001M-0000-001A-22B9-B
Abstract
The masses of 222,224,226–233Fr 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.