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

The masses of Fr222,224,226–233 and Ra233,234 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 Fr233. We study the evolution of the odd-even staggering of binding energies along the francium a...

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Detalles Bibliográficos
Autores principales: Kreim, S, Beck, D, Blaum, K, Borgmann, Ch, 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
Lenguaje:eng
Publicado: 2014
Materias:
Nuclear Structure
Nuclear Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1103/PhysRevC.90.024301
http://cds.cern.ch/record/2124823
Descripción
Sumario:The masses of Fr222,224,226–233 and Ra233,234 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 Fr233. 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.

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