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

S. Kreim, D. Beck, K. Blaum, Ch. Borgmann, M. Breitenfeldt, T. E. Cocolios, A. Gottberg, F. Herfurth, M. Kowalska, Yu. A. Litvinov, D. Lunney, V. Manea (+9 others)
2014 Physical Review C  
The masses of 222,224,[226][227][228][229][230][231][232][233]234 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 233 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, 3 (N ). An enhancement of the staggering of 3 (N ) is observed towards neutron number N = 146, which points to
more » ... 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.
doi:10.1103/physrevc.90.024301 fatcat:zf5osib3oja3hdd26w5b6webme