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

Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient Po-196,Po-198,Po-200,Po-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, Po-196,Po-198, the transitional and diagonal matrix elements of the 2(1)(+) state are determined. In Po-196,Po-198 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 in polonium isotopes, confirming the onset of deformation from Po-196 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.

Bastin, B. (author)
Gaffney, L. P. (author)
Wrzosek-Lipska, K. (author)
Auranen, K. (author)
Bauer, C. (author)
Bender, M. (author)
Bildstein, V. (author)
Blazhev, A. (author)
Boenig, S. (author)
Bree, N. (author)
Clement, E. (author)
Cocolios, T. E. (author)
Damyanova, A. (author)
Darby, I. (author)
De Witte, H. (author)
Di Julio, DouglasLund University,Lunds universitet,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)esss-dd_ (author)
Diriken, J. (author)
Fransen, C. (author)
Garcia-Ramos, J. E. (author)
Gernhaeuser, R. (author)
Grahn, T. (author)
Heenen, P. -H. (author)
Hess, H. (author)
Heyde, K. (author)
Huyse, M. (author)
Iwanicki, J. (author)
Jakobsson, U. (author)
Konki, J. (author)
Kroell, T. (author)
Laurent, B. (author)
Lecesne, N. (author)
Lutter, R. (author)
Pakarinen, J. (author)
Peura, P. (author)
Piselli, E. (author)
Prochniak, L. (author)
Rahkila, P. (author)
Rapisarda, E. (author)
Reiter, P. (author)
Scheck, M. (author)
Seidlitz, M. (author)
Sferrazza, M. (author)
Siebeck, B. (author)
Sjodin, M. (author)
Tornqvist, H. (author)
Traykov, E. (author)
Van De Walle, J. (author)
Van Duppen, P. (author)
Vermeulen, M. (author)
Voulot, D. (author)
Warr, N. (author)
Wenander, F. (author)
Wimmer, K. (author)
Zielinska, M. (author)
Fysiska institutionenInstitutioner vid LTH (creator_code:org_t)

By the author/editor: Kesteloot, N.; Bastin, B.; Gaffney, L. P.; Wrzosek-Lipska, ...; Auranen, K.; Bauer, C.; show more...; Bender, M.; Bildstein, V.; Blazhev, A.; Boenig, S.; Bree, N.; Clement, E.; Cocolios, T. E.; Damyanova, A.; Darby, I.; De Witte, H.; Di Julio, Dougla ...; Diriken, J.; Fransen, C.; Garcia-Ramos, J. ...; Gernhaeuser, R.; Grahn, T.; Heenen, P. -H.; Hess, H.; Heyde, K.; Huyse, M.; Iwanicki, J.; Jakobsson, U.; Konki, J.; Kroell, T.; Laurent, B.; Lecesne, N.; Lutter, R.; Pakarinen, J.; Peura, P.; Piselli, E.; Prochniak, 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.; Zielinska, M.; show less...

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NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Subatomic Physic ...

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