Gaffney, L. P., Robinson, A. P., Jenkins, D. G., Andreyev, A. N., Bender, M., Blazhev, A., Bree, N., Bruyneel, B., Butler, P. A., Cocolios, T. E., Davinson, T., Deacon, A. N., De Witte, H., DiJulio, D., Diriken, J., Ekstrom, A., Fransen, Ch., Freeman, S. J., Geibel, K., Grahn, T., Hadinia, B., Hass, M., Heenen, P. -H., Hess, H., Huyse, M., Jakobsson, U., Kesteloot, N., Konki, J., Kroell, Th., Kumar, V., Ivanov, O., Martin-Haugh, S., Muecher, D., Orlandi, R., Pakarinen, J., Petts, A., Peura, P., Rahkila, P., Reiter, P., Scheck, M., Seidlitz, M., Singh, K., Smith, J. F., Van de Walle, J., Van Duppen, P., Voulot, D., Wadsworth, R., Warr, N., Wenander, F., Wimmer, K., Wrzosek-Lipska, K. and Zielinska, M. (2015). Collectivity in the light radon nuclei measured directly via Coulomb excitation. Phys. Rev. C, 91 (6). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1089-490X

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Abstract

Background: Shape coexistence in heavy nuclei poses a strong challenge to state-of-the-art nuclear models, where several competing shape minima are found close to the ground state. A classic region for investigating this phenomenon is in the region around Z = 82 and the neutron midshell at N = 104. Purpose: Evidence for shape coexistence has been inferred from a-decay measurements, laser spectroscopy, and in-beam measurements. While the latter allow the pattern of excited states and rotational band structures to be mapped out, a detailed understanding of shape coexistence can only come from measurements of electromagnetic matrix elements. Method: Secondary, radioactive ion beams of Rn-202 and Rn-204 were studied by means of low-energy Coulomb excitation at the REX-ISOLDE in CERN. Results: The electric-quadrupole (E2) matrix element connecting the ground state and first excited 2(1)(+) state was extracted for both Rn-202 and Rn-204, corresponding to B(E2; 2(1)(+) -> 0(1)(+)) = 29(-8)(+8) and 43(-12)(+17) W.u., respectively. Additionally, E2 matrix elements connecting the 2(1)(+) state with the 4(1)(+) and 2(2)(+) states were determined in Rn-202. No excited 0(+) states were observed in the current data set, possibly owing to a limited population of second-order processes at the currently available beam energies. Conclusions: The results are discussed in terms of collectivity and the deformation of both nuclei studied is deduced to be weak, as expected from the low-lying level-energy schemes. Comparisons are also made to state-of-the-art beyond-mean-field model calculations and the magnitude of the transitional quadrupole moments are well reproduced.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Gaffney, L. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Robinson, A. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jenkins, D. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Andreyev, A. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bender, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blazhev, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bree, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bruyneel, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Butler, P. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cocolios, T. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Davinson, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deacon, A. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
De Witte, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
DiJulio, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Diriken, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ekstrom, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fransen, Ch.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Freeman, S. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Geibel, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grahn, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hadinia, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hass, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Heenen, P. -H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hess, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Huyse, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jakobsson, U.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kesteloot, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Konki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kroell, Th.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kumar, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ivanov, O.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martin-Haugh, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Muecher, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Orlandi, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pakarinen, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Petts, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Peura, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rahkila, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Reiter, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Scheck, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Seidlitz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Singh, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Smith, J. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van de Walle, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Van Duppen, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Voulot, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wadsworth, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Warr, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wenander, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wimmer, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wrzosek-Lipska, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zielinska, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-400966
DOI: 10.1103/PhysRevC.91.064313
Journal or Publication Title: Phys. Rev. C
Volume: 91
Number: 6
Date: 2015
Publisher: AMER PHYSICAL SOC
Place of Publication: COLLEGE PK
ISSN: 1089-490X
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SHAPE COEXISTENCE; GAMMA-DECAY; DATA SHEETS; STATES; ISOTOPE; AG-107; TRANSITION; RH-103; PB; HGMultiple languages
Physics, NuclearMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/40096

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