9737Rb60: The cornerstone of the region of deformation around A ∼ 100

C. Sotty, M. Zielinska, G. Georgiev, D. L. Balabanski, A. E. Stuchbery, A. Blazhev, N. Bree, R. Chevrier, S. Das Gupta, J. M. Daugas, T. Davinson, H. De Witte, J. Diriken, L. P. Gaffney, K. Geibel, K. Hadynska-Klek, F. G. Kondev, J. Konki, T. Kroell, P. MorelP. Napiorkowski, J. Pakarinen, P. Reiter, M. Scheck, M. Seidlitz, B. Siebeck, H. Toernqvist, N. Warr, F. Wenander

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Excited states of the neutron-rich nuclei 97,99 Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of 97 Rb as being built on the πg9/2[431] 
3/2+ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of
97Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The 99Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.
Original languageEnglish
Article number172501
Number of pages6
JournalPhysical Review Letters
Issue number17
Early online date20 Oct 2015
Publication statusPublished - 23 Oct 2015


  • Neutron-rich nuclei
  • Rb
  • Deformation


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