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

N. Kesteloot; B. Bastin; L. P. Gaffney; K. Wrzosek-Lipska; K. Auranen; C. Bauer; M. Bender; V. Bildstein; A. Blazhev; S. Bönig; N. Bree; E. Clément; T. E. Cocolios; A. Damyanova; I. Darby; H. De Witte; D. Di Julio; J. Diriken; C. Fransen; J. E. Garcia-Ramos; R. Gernhäuser; T. Grahn; P. -H. Heenen; H. Hess; K. Heyde; M. Huyse; J. Iwanicki; U. Jakobsson; J. Konki; T. Kröll; B. Laurent; N. Lecesne; R. Lutter; J. Pakarinen; P. Peura; E. Piselli; L. Próchniak; P. Rahkila; E. Rapisarda; P. Reiter; M. Scheck; M. Seidlitz; M. Sferrazza; B. Siebeck; M. Sjodin; H. Tornqvist; E. Traykov; J. Van De Walle; P. Van Duppen; M. Vermeulen; D. Voulot; N. Warr; F. Wenander; K. Wimmer; M. Zielinska

doi:10.1103/PhysRevC.92.054301

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

N. Kesteloot, B. Bastin, L. P. Gaffney, K. Wrzosek-Lipska, K. Auranen, C. Bauer, M. Bender, V. Bildstein, A. Blazhev, S. Bönig, N. Bree, E. Clément, T. E. Cocolios, A. Damyanova, I. Darby, H. De Witte, D. Di Julio, J. Diriken, C. Fransen, J. E. Garcia-RamosR. Gernhäuser, T. Grahn, P. -H. Heenen, H. Hess, K. Heyde, M. Huyse, J. Iwanicki, U. Jakobsson, J. Konki, T. Kröll, B. Laurent, N. Lecesne, R. Lutter, J. Pakarinen, P. Peura, E. Piselli, L. Próchniak, P. Rahkila, E. Rapisarda, P. Reiter, M. Scheck, M. Seidlitz, M. Sferrazza, B. Siebeck, M. Sjodin, H. Tornqvist, E. Traykov, J. Van De Walle, P. Van Duppen, M. Vermeulen, D. Voulot, N. Warr, F. Wenander, K. Wimmer, M. Zielinska

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Abstract

Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient ^{196,198,200,202}Po 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, ^200,202Po, the transitional and diagonal matrix elements of the 2⁺₁state are determined. In ^196,198Po 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 ¹⁹⁶Po 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.

Original language	English
Article number	054301
Journal	Physical Review C
Volume	92
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.92.054301
Publication status	Published - 4 Nov 2015

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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., ... Zielinska, M. (2015). Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes. Physical Review C, 92(5), Article 054301 . https://doi.org/10.1103/PhysRevC.92.054301

@article{8292c73155e242e9a5da407b3601d535,

title = "Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes",

abstract = "Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient 196,198,200,202Po 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, 200,202Po, the transitional and diagonal matrix elements of the 2+1state are determined. In 196,198Po 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 196Po 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.",

author = "N. Kesteloot and B. Bastin and Gaffney, {L. P.} and K. Wrzosek-Lipska and K. Auranen and C. Bauer and M. Bender and V. Bildstein and A. Blazhev and S. B{\"o}nig and N. Bree and E. Cl{\'e}ment and Cocolios, {T. E.} and A. Damyanova and I. Darby and {De Witte}, H. and {Di Julio}, D. and J. Diriken and C. Fransen and Garcia-Ramos, {J. E.} and R. Gernh{\"a}user and T. Grahn and Heenen, {P. -H.} and H. Hess and K. Heyde and M. Huyse and J. Iwanicki and U. Jakobsson and J. Konki and T. Kr{\"o}ll and B. Laurent and N. Lecesne and R. Lutter and J. Pakarinen and P. Peura and E. Piselli and L. Pr{\'o}chniak and P. Rahkila and E. Rapisarda and P. Reiter and M. Scheck and M. Seidlitz and M. Sferrazza and B. Siebeck and M. Sjodin and H. Tornqvist and E. Traykov and {Van De Walle}, J. and {Van Duppen}, P. and M. Vermeulen and D. Voulot and N. Warr and F. Wenander and K. Wimmer and M. Zielinska",

year = "2015",

month = nov,

day = "4",

doi = "10.1103/PhysRevC.92.054301",

language = "English",

volume = "92",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "5",

}

Kesteloot, N, Bastin, B, Gaffney, LP, Wrzosek-Lipska, K, Auranen, K, Bauer, C, Bender, M, Bildstein, V, Blazhev, A, Bönig, S, Bree, N, Clément, E, Cocolios, TE, Damyanova, A, Darby, I, De Witte, H, Di Julio, D, Diriken, J, Fransen, C, Garcia-Ramos, JE, 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 & Zielinska, M 2015, 'Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes', Physical Review C, vol. 92, no. 5, 054301 . https://doi.org/10.1103/PhysRevC.92.054301

TY - JOUR

T1 - Deformation and mixing of coexisting shapes in neutron-deficient polonium isotopes

AU - Kesteloot, N.

AU - Bastin, B.

AU - Gaffney, L. P.

AU - Wrzosek-Lipska, K.

AU - Auranen, K.

AU - Bauer, C.

AU - Bender, M.

AU - Bildstein, V.

AU - Blazhev, A.

AU - Bönig, S.

AU - Bree, N.

AU - Clément, E.

AU - Cocolios, T. E.

AU - Damyanova, A.

AU - Darby, I.

AU - De Witte, H.

AU - Di Julio, D.

AU - Diriken, J.

AU - Fransen, C.

AU - Garcia-Ramos, J. E.

AU - Gernhäuser, R.

AU - Grahn, T.

AU - Heenen, P. -H.

AU - Hess, H.

AU - Heyde, K.

AU - Huyse, M.

AU - Iwanicki, J.

AU - Jakobsson, U.

AU - Konki, J.

AU - Kröll, T.

AU - Laurent, B.

AU - Lecesne, N.

AU - Lutter, R.

AU - Pakarinen, J.

AU - Peura, P.

AU - Piselli, E.

AU - Próchniak, L.

AU - Rahkila, P.

AU - Rapisarda, E.

AU - Reiter, P.

AU - Scheck, M.

AU - Seidlitz, M.

AU - Sferrazza, M.

AU - Siebeck, B.

AU - Sjodin, M.

AU - Tornqvist, H.

AU - Traykov, E.

AU - Van De Walle, J.

AU - Van Duppen, P.

AU - Vermeulen, M.

AU - Voulot, D.

AU - Warr, N.

AU - Wenander, F.

AU - Wimmer, K.

AU - Zielinska, M.

PY - 2015/11/4

Y1 - 2015/11/4

N2 - Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient 196,198,200,202Po 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, 200,202Po, the transitional and diagonal matrix elements of the 2+1state are determined. In 196,198Po 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 196Po 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.

AB - Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient 196,198,200,202Po 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, 200,202Po, the transitional and diagonal matrix elements of the 2+1state are determined. In 196,198Po 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 196Po 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.

U2 - 10.1103/PhysRevC.92.054301

DO - 10.1103/PhysRevC.92.054301

M3 - Article

SN - 2469-9985

VL - 92

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054301

ER -

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

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