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Author(s)
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Kreim, S (CERN ; Heidelberg, Max Planck Inst.) ; Beck, D (Darmstadt, GSI) ; Blaum, K (Heidelberg, Max Planck Inst.) ; Borgmann, Ch (Heidelberg, Max Planck Inst.) ; Breitenfeldt, M (Leuven U.) ; Cocolios, T E (CERN) ; Gottberg, A (CERN) ; Herfurth, F (Darmstadt, GSI) ; Kowalska, M (CERN) ; Litvinov, Yu A (Darmstadt, GSI) ; Lunney, D (CSNSM, Orsay) ; Manea, V (CSNSM, Orsay) ; Mendonca, T M (CERN) ; Naimi, S (Nishina Ctr., RIKEN) ; Neidherr, D (Darmstadt, GSI) ; Rosenbusch, M (Greifswald U.) ; Schweikhard, L (Greifswald U.) ; Stora, Th (CERN) ; Wienholtz, F (Greifswald U.) ; Wolf, R N (Greifswald U.) ; Zuber, K (Dresden, Tech. U.) |
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Abstract
| 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. |