Competition between pairing correlations and deformation from the odd-even mass staggering of francium and radium isotopes
- Kreim, S.
- Beck, D.
- Blaum, K.
- Borgmann, C.
- Breitenfeldt, M.
- Cocolios, T.
- Gottberg, A.
- Herfurth, F.
- Kowalska, M.
- Litvinov, Y.
- Lunney, D.
- Manea, V.
- Mendonca, T.
- Naimi, S.
- Neidherr, D.
- Rosenbusch, M.
- Schweikhard, L.
- Stora, T.
- Wienholtz, F.
- Wolf, R.
- Zuber, K.
DOIAbstract
The masses of <sup>222,224,226–233</sup>Fr and <sup>233,234</sup>Ra 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 <sup>233</sup>Fr. 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, Δ<sup>3</sup>(N). An enhancement of the staggering of Δ<sup>3</sup>(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 deformatio...
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