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Title	Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes
Author(s)	Kesteloot, N (KU Leuven, Dept. Phys. Astron. ; SCK-CEN, Mol) ; Bastin, B (KU Leuven, Dept. Phys. Astron. ; GANIL) ; Gaffney, L P (KU Leuven, Dept. Phys. Astron. ; Liverpool U.) ; Wrzosek-Lipska, K (KU Leuven, Dept. Phys. Astron. ; Warsaw U., Heavy Ion Lab) ; Auranen, K (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Bauer, C (Darmstadt, Tech. Hochsch.) ; Bender, M (CENBG, Gradignan) ; Bildstein, V (Munich, Tech. U.) ; Blazhev, A (Cologne U.) ; Bönig, S (Darmstadt, Tech. Hochsch.) ; Bree, N (KU Leuven, Dept. Phys. Astron.) ; Clément, E (GANIL) ; Cocolios, T E (KU Leuven, Dept. Phys. Astron. ; CERN ; Manchester U.) ; Damyanova, A (U. Geneva(main)) ; Darby, I (KU Leuven, Dept. Phys. Astron. ; Jyvaskyla U. ; Helsinki Inst. of Phys.) ; De Witte, H (KU Leuven, Dept. Phys. Astron.) ; Di Julio, D (Lund U.) ; Diriken, J (KU Leuven, Dept. Phys. Astron. ; SCK-CEN, Mol) ; Fransen, C (Cologne U.) ; García-Ramos, J E (Huelva U.) ; Gernhäuser, R (Munich, Tech. U.) ; Grahn, T (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Heenen, P H (Brussels U., PNTPM) ; Hess, H (Cologne U.) ; Heyde, K (Gent U.) ; Huyse, M (KU Leuven, Dept. Phys. Astron.) ; Iwanicki, J (Warsaw U., Heavy Ion Lab) ; Jakobsson, U (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Konki, J (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Kröll, T (Darmstadt, Tech. Hochsch.) ; Laurent, B (IRFU, SPhN, Saclay) ; Lecesne, N (GANIL) ; Lutter, R (LMU Munich (main)) ; Pakarinen, J (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Peura, P (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Piselli, E (CERN) ; Próchniak, L (Warsaw U., Heavy Ion Lab) ; Rahkila, P (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Rapisarda, E (KU Leuven, Dept. Phys. Astron. ; CERN) ; Reiter, P (Cologne U.) ; Scheck, M (Liverpool U. ; Darmstadt, Tech. Hochsch. ; West Scotland U. ; SUPA, UK) ; Seidlitz, M (Cologne U.) ; Sferrazza, M (Brussels U.) ; Siebeck, B (Cologne U.) ; Sjodin, M (GANIL) ; Tornqvist, H (CERN) ; Traykov, E (GANIL) ; Van De Walle, J (CERN) ; Van Duppen, P (KU Leuven, Dept. Phys. Astron.) ; Vermeulen, M (York U., England) ; Voulot, D (CERN) ; Warr, N (Cologne U.) ; Wenander, F (CERN) ; Wimmer, K (Munich, Tech. U.) ; Zielińska, M (IRFU, SPhN, Saclay ; Warsaw U., Heavy Ion Lab)
Publication	2015
Number of pages	17
In:	Phys. Rev. C 92 (2015) 054301
DOI	10.1103/PhysRevC.92.054301
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN ISOLDE
Abstract	Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient Po196,198,200,202 isotopes at the REX-ISOLDE facility. A set of matrix elements, coupling the low-lying states in these isotopes, is extracted. In the two heaviest isotopes, Po200,202, the transitional and diagonal matrix elements of the 21+ state are determined. In Po196,198 multistep Coulomb excitation is observed, populating the 41+,02+, and 22+ states. The experimental results are compared to the results from the measurement of mean-square charge radii in polonium isotopes, confirming the onset of deformation from Po196 onwards. Three model descriptions are used to compare to the data. Calculations with the beyond-mean-field model, the interacting boson model, and the general Bohr Hamiltonian model show partial agreement with the experimental data. Finally, calculations with a phenomenological two-level mixing model hint at the mixing of a spherical structure with a weakly deformed rotational structure.
Copyright/License	publication: © 2015-2024 The Author(s) (License: CC-BY-3.0)

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