97Rb – the cornerstone of the region of deformation around A ~ 100

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 𝜋⁢𝑔9/2 [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
97
Rb
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
99
Rb
case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Authors: C. Sotty, M. Zielińska, 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. Hadyńska-Klȩk, F. G. Kondev, J. Konki, T. Kröll, P. Morel, P. Napiorkowski, J. Pakarinen, P. Reiter, M. Scheck, M. Seidlitz, B. Siebeck, G. Simpson, H. Tornqvist, N. Warr, F. Wenander

Doi: 10.1103/PhysRevLett.115.172501

Issue number:

Journal: Phys. Rev. Lett.

Page number: 172501

Published on: 2015-10-20

Year: