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Article
Title	Coulomb excitation of $^{222}$Rn
Author(s)	Spagnoletti, P (West Scotland U. ; Simon Fraser U., Dept. Chem.) ; Butler, P A (Liverpool U.) ; Gaffney, L P (Liverpool U. ; CERN) ; Abrahams, K (Western Cape U.) ; Bowry, M (West Scotland U. ; TRIUMF) ; Cederkäll, J (Lund U.) ; Chupp, T (U. Michigan, Ann Arbor) ; de Angelis, G (INFN, Legnaro) ; De Witte, H (Leuven U.) ; Garrett, P E (Guelph U.) ; Goldkuhle, A (Cologne U.) ; Henrich, C (Darmstadt, Tech. U.) ; Illana, A (INFN, Legnaro ; Jyvaskyla U.) ; Johnston, K (CERN) ; Joss, D T (Liverpool U.) ; Keatings, J M (West Scotland U.) ; Kelly, N A (West Scotland U.) ; Komorowska, M (Warsaw U., Heavy Ion Lab) ; Konki, J (CERN) ; Kröll, T (Darmstadt, Tech. U.) ; Lozano, M (CERN) ; Singh, B S Nara (West Scotland U.) ; O'Donnell, D (West Scotland U.) ; Ojala, J (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Page, R D (Liverpool U.) ; Pedersen, L G (Oslo U.) ; Raison, C (York U., England) ; Reiter, P (Cologne U.) ; Rodriguez, J A (CERN) ; Rosiak, D (Cologne U.) ; Rothe, S (CERN) ; Scheck, M (West Scotland U.) ; Seidlitz, M (Cologne U.) ; Shneidman, T M (Dubna, JINR) ; Siebeck, B (Cologne U.) ; Sinclair, J (West Scotland U.) ; Smith, J F (West Scotland U.) ; Stryjczyk, M (Jyvaskyla U. ; Leuven U.) ; Van Duppen, P (Leuven U.) ; Viñals, S (Madrid, CIEMAT) ; Virtanen, V (Jyvaskyla U. ; Helsinki Inst. of Phys.) ; Wrzosek-Lipska, K (Warsaw U., Heavy Ion Lab) ; Warr, N (Cologne U.) ; Zielińska, M (IRFU, Saclay)
Publication	2022
Number of pages	10
In:	Phys. Rev. C 105 (2022) 024323
DOI	10.1103/PhysRevC.105.024323 (publication)
Subject category	Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN HIE ISOLDE
Abstract	The nature of quadrupole and octupole collectivity in $^{222}$Rn was investigated by determining the electric-quadrupole (E2) and octupole (E3) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive $^{222}$Rn beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball $\gamma$ -ray spectrometer following the bombardment of two targets, $^{120}$Sn and $^{60}$Ni. Transition E2 matrix elements within the ground-state and octupole bands were measured up to 10 ¯h and the results were consistent with a constant intrinsic electric-quadrupole moment, 518(11) $e$ fm$^2$ . The values of the intrinsic electric-octupole moment for the $0^+ \to 3^-$ and $2^+ \to 5^-$ transitions were found to be respectively $2360^{+300}_{-210}$ $e$ fm$_3$ and $2300^{+300}_{-500}$ $e$ fm$^3$ while a smaller value, $1200^{+500}_{-900}$ $e$ fm$^3$ , was found for the $2^+ \to 1^-$ transition. In addition, four excited non-yrast states were identified in this work via γ -γ coincidences.
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