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

Kesteloot, N.; Bastin, B.; Gaffney, L. P.; Wrzosek-Lipska, K.; Auranen, K.; Bauer, C.; Bender, M.; Bildstein, V.; Blazhev, A. and Boenig, S., et al. (2015) In Physical Review C (Nuclear Physics) 92(5).
Abstract
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... (More)
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. (Less)
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Physical Review C (Nuclear Physics)
volume
92
issue
5
publisher
American Physical Society
external identifiers
  • wos:000364019000001
  • scopus:84947074229
ISSN
0556-2813
DOI
10.1103/PhysRevC.92.054301
language
English
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yes
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ff80afcb-3bfb-440d-b104-f474468292ca (old id 8386491)
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2015-12-22 08:11:04
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@article{ff80afcb-3bfb-440d-b104-f474468292ca,
  abstract     = {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.},
  articleno    = {054301},
  author       = {Kesteloot, N. and Bastin, B. and Gaffney, L. P. and Wrzosek-Lipska, K. and Auranen, K. and Bauer, C. and Bender, M. and Bildstein, V. and Blazhev, A. and Boenig, S. and Bree, N. and Clement, E. and Cocolios, T. E. and Damyanova, A. and Darby, I. and De Witte, H. and Di Julio, Douglas and Diriken, J. and Fransen, C. and Garcia-Ramos, J. E. and Gernhaeuser, R. and Grahn, T. and Heenen, P. -H. and Hess, H. and Heyde, K. and Huyse, M. and Iwanicki, J. and Jakobsson, U. and Konki, J. and Kroell, T. and Laurent, B. and Lecesne, N. and Lutter, R. and Pakarinen, J. and Peura, P. and Piselli, E. and Prochniak, L. and Rahkila, P. and Rapisarda, E. and Reiter, P. and Scheck, M. and Seidlitz, M. and Sferrazza, M. and Siebeck, B. and Sjodin, M. and Tornqvist, H. and Traykov, E. and Van De Walle, J. and Van Duppen, P. and Vermeulen, M. and Voulot, D. and Warr, N. and Wenander, F. and Wimmer, K. and Zielinska, M.},
  issn         = {0556-2813},
  language     = {eng},
  number       = {5},
  publisher    = {American Physical Society},
  series       = {Physical Review C (Nuclear Physics)},
  title        = {Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes},
  url          = {http://dx.doi.org/10.1103/PhysRevC.92.054301},
  volume       = {92},
  year         = {2015},
}