KESTELOOT, N.; BASTIN, B.; GAFFNEY, L. P.; WRZOSEK-LIPSKA, K.; AURANEN, K.; BAUER, C.; BENDER, M.; BILDSTEIN, V.; BLAZHEV, A.; BÖNIG, S.; BREE, N.; CLÉMENT, E.; COCOLIOS, T. E.; DAMYANOVA, A.; DARBY, I.; DE WITTE, H.; DI JULIO, D.; DIRIKEN, J.; FRANSEN, C.; GARCÍA-RAMOS, J. E.; GERNHÄUSER, R.; GRAHN, T.; HEENEN, P.-H.; HESS, H.; HEYDE, K.; HUYSE, M.; IWANICKI, J.; JAKOBSSON, U.; KONKI, J.; KRÖLL, T.; LAURENT, B.; LECESNE, N.; LUTTER, R.; PAKARINEN, J.; PEURA, P.; PISELLI, E.; PRÓCHNIAK, L.; RAHKILA, P.; RAPISARDA, E.; REITER, P.; SCHECK, M.; SEIDLITZ, M.; SFERRAZZA, M.; SIEBECK, B.; SJODIN, M.; TORNQVIST, H.; TRAYKOV, E.; VAN DE WALLE, J.; VAN DUPPEN, P.; VERMEULEN, M.; VOULOT, D.; WARR, N.; WENANDER, F.; WIMMER, K.; ZIELIŃSKA, M.

doi:10.1103/PhysRevC.92.054301

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KESTELOOT, N.

BASTIN, B.
Grand Accélérateur National d'Ions Lourds [GANIL]

GAFFNEY, L. P.

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Physical Review C. 2015-11, vol. 92, n° 5, p. 054301

American Physical Society

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Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient $^{196,198,200,202}$Poisotopes 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, $^{200,202}$Po, the transitional and diagonal matrix elements of the $2^+_1$ state are determined. In $^{196,198}$Po multistep Coulomb excitation is observed, populating the $4^+_1$ , $0^+_2$ , and $2^+_2$ states.The experimental results are compared to the results from the measurement of mean-square charge radii inpolonium isotopes, confirming the onset of deformation from $^{196}$Po onwards. Three model descriptions are usedto compare to the data. Calculations with the beyond-mean-field model, the interacting boson model, and thegeneral Bohr Hamiltonian model show partial agreement with the experimental data. Finally, calculations witha phenomenological two-level mixing model hint at the mixing of a spherical structure with a weakly deformedrotational structure.< Réduire

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Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes

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