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Collectivity in the light radon nuclei measured directly via Coulomb excitation | | L. P. Gaffney
; A. P. Robinson
; D. G. Jenkins
; A. N. Andreyev
; M. Bender
; A. Blazhev
; N. Bree
; B. Bruyneel
; P. A. Butler
; T. E. Cocolios
; T. Davinson
; A. N. Deacon
; H. De Witte
; D. DiJulio
; J. Diriken
; A. Ekström
; Ch. Fransen
; S. J. Freeman
; K. Geibel
; T. Grahn
; B. Hadinia
; M. Hass
; P.-H. Heenen
; H. Hess
; M. Huyse
; U. Jakobsson
; N. Kesteloot
; J. Konki
; Th. Kröll
; V. Kumar
; O. Ivanov
; S. Martin-Haugh
; D. Mücher
; R. Orlandi
; J. Pakarinen
; A. Petts
; P. Peura
; P. Rahkila
; P. Reiter
; M. Scheck
; M. Seidlitz
; K. Singh
; J. F. Smith
; J. Van de Walle
; P. Van Duppen
; D. Voulot
; R. Wadsworth
; N. Warr
; F. Wenander
; K. Wimmer
; K. Wrzosek-Lipska
; M. Zielińska
; | | Date: |
11 Mar 2015 | | 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 mid-shell at $N=104$.
Purpose: Evidence for shape coexistence has been inferred from $alpha$-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 $^{202}$Rn and $^{204}$Rn were
studied by means of low-energy Coulomb excitation at the REX-ISOLDE facility in
CERN.
Results: The electric-quadrupole ($E2$) matrix element connecting the ground
state and first-excited $2^{+}_{1}$ state was extracted for both $^{202}$Rn and
$^{204}$Rn, corresponding to ${B(E2;2^{+}_{1} o 2^{+}_{1})=29^{+8}_{-8}}$
W.u. and $43^{+17}_{-12}$ W.u., respectively. Additionally, $E2$ matrix
elements connecting the $2^{+}_{1}$ state with the $4^{+}_{1}$ and $2^{+}_{2}$
states were determined in $^{202}$Rn. No excited $0^{+}$ states were observed
in the current data set, possibly due 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. | | Source: | arXiv, 1503.3245 | | Services: | Forum | Review | PDF | Favorites | |
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