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Title	$^{97}_{37}$Rb$_{60}$: The Cornerstone of the Region of Deformation around $A\sim 100$
Author(s)	Sotty, C (CSNSM, Orsay ; Leuven U.) ; Zielińska, M (Warsaw U., Heavy Ion Lab ; IRFU, SPhN, Saclay) ; Georgiev, G (CSNSM, Orsay) ; Balabanski, D  L (Bucharest, IFIN-HH) ; Stuchbery, A  E (Australian Natl. U., Canberra (main)) ; Blazhev, A (Cologne U.) ; Bree, N (Leuven U.) ; Chevrier, R (CEA DAM) ; Das Gupta, S (U. Camerino, Dept. Phys. ; INFN, Perugia) ; Daugas, J  M (CEA DAM) ; Davinson, T (U. Edinburgh (main)) ; De Witte, H (Leuven U.) ; Diriken, J (Leuven U. ; SCK-CEN, Mol) ; Gaffney, L  P (U. Liverpool (main) ; Leuven U.) ; Geibel, K (Cologne U.) ; Hadyńska-Klȩk, K (Warsaw U., Heavy Ion Lab) ; Kondev, F  G (Argonne) ; Konki, J (CERN ; Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Kröll, T (Darmstadt, Tech. U.) ; Morel, P (CEA DAM) ; Napiorkowski, P (Warsaw U., Heavy Ion Lab) ; Pakarinen, J (CERN ; Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Reiter, P (Cologne U.) ; Scheck, M (Darmstadt, Tech. U.) ; Seidlitz, M (Cologne U.) ; Siebeck, B (Cologne U.) ; Simpson, G (LPSC, Grenoble) ; Törnqvist, H (CERN) ; Warr, N (Cologne U.) ; Wenander, F (CERN)
Publication	2015
Number of pages	6
In:	Phys. Rev. Lett. Phys. Rev. Lett.
DOI	10.1103/PhysRevLett.115.172501 10.1103/PhysRevLett.115.209902 (Addendum)
Subject category	Nuclear Physics - Experiment
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.
Copyright/License	publication: © 2015-2025 The Author(s) (License: CC-BY-3.0)

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