Collectivity in the light radon nuclei measured directly via Coulomb excitation

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Gaffney, LP ORCID: 0000-0002-2938-3696, Robinson, AP, Jenkins, DG, Andreyev, AN, Bender, M, Blazhev, A, Bree, N, Bruyneel, B, Butler, PA ORCID: 0000-0001-6080-9205, Cocolios, TE et al (show 42 more authors) , Davinson, T, Deacon, AN, De Witte, H, DiJulio, D, Diriken, J, Ekstrom, A, Fransen, Ch, Freeman, SJ, 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, JF, Van de Walle, J, Van Duppen, P, Voulot, D, Wadsworth, R, Warr, N ORCID: 0000-0001-7275-1063, Wenander, F, Wimmer, K, Wrzosek-Lipska, K and Zielinska, M (2015) Collectivity in the light radon nuclei measured directly via Coulomb excitation PHYSICAL REVIEW C, 91 (6). 064313-. ISSN 2469-9985, 2469-9993

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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 α-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 Rn202 and Rn204 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 21+ state was extracted for both Rn202 and Rn204, corresponding to B(E2;21+→01+)=29-8+8 and 43-12+17 W.u., respectively. Additionally, E2 matrix elements connecting the 21+ state with the 41+ and 22+ states were determined in Rn202. 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:	Article
Additional Information:	12 pages, 14 figures
Uncontrolled Keywords:	nucl-ex, nucl-ex
Depositing User:	Symplectic Admin
Date Deposited:	05 Jun 2020 07:46
Last Modified:	16 Jun 2026 08:15
DOI:	10.1103/PhysRevC.91.064313
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3089515
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