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Rb379760: The Cornerstone of the Region of Deformation around A∼100

Abstract : Excited states of the neutron-rich nuclei Rb97,99 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 Rb97 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 Rb97 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 Rb99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.
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Contributor : Emmanuelle Vernay <>
Submitted on : Friday, November 6, 2015 - 3:49:23 PM
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C. Sotty, M. Zielińska, G. Georgiev, D. l. Balabanski, A. e. Stuchbery, et al.. Rb379760: The Cornerstone of the Region of Deformation around A∼100. Physical Review Letters, American Physical Society, 2015, 115 (17), pp.172501. ⟨10.1103/PhysRevLett.115.172501⟩. ⟨in2p3-01225718⟩