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

S. Kreim,1,2,* D. Beck,3 K. Blaum,2 Ch. Borgmann,2,† M. Breitenfeldt,4 T. E. Cocolios,1,‡ A. Gottberg,1 F. Herfurth,3 M. Kowalska,1 Yu. A. Litvinov,3 D. Lunney,5 V. Manea,5 T. M. Mendonca,1 S. Naimi,6 D. Neidherr,3 M. Rosenbusch,7 L. Schweikhard,7 Th. Stora,1 F. Wienholtz,7 R. N. Wolf,7,§ and K. Zuber8 1CERN, 1211 Geneva, Switzerland 2Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany 3GSI Helmholtzzentrum fur Schwerionenforschung GmbH, 64291 Darmstadt, Germany 4KU Leuven, 3001 Leuven, Belgium 5CSNSM-IN2P3-CNRS, Universite Paris-Sud, 91406 Orsay, France 6RIKEN Nishina Center for Accelerator-Based Science, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan 7Institut fur Physik, Ernst-Moritz-Arndt-Universitat, 17487 Greifswald, Germany 8Technische Universitat Dresden, 01069 Dresden, Germany (Received 28 May 2014; published 4 August 2014)