Coulomb excitation of Rn 222

P. Spagnoletti, P. A. Butler, L. P. Gaffney, K. Abrahams, M. Bowry, J. Cederkäll, T. Chupp, G. De Angelis, H. De Witte, P. E. Garrett, A. Goldkuhle, C. Henrich, A. Illana, K. Johnston, D. T. Joss, J. M. Keatings, N. A. Kelly, M. Komorowska, J. Konki, T. KröllB. S.Nara Singh, D. O'Donnell, J. Ojala, R. D. Page, C. Raison, P. Reiter, D. Rosiak, S. Rothe, M. Scheck, M. Seidlitz, T. M. Shneidman, B. Siebeck, J. Sinclair, J. F. Smith, M. Stryjczyk, P. Van Duppen, S. Viñals, V. Virtanen, K. Wrzosek-Lipska, N. Warr, M. Zielińska

Research output: Contribution to journalArticlepeer-review

Abstract

The nature of quadrupole and octupole collectivity in Rn222 was investigated by determining the electric-quadrupole (E2) and octupole (E3) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive Rn222 beam, accelerated to 4.23 MeV/u, was provided by the HIE-ISOLDE facility at CERN. Data were collected in the Miniball γ-ray spectrometer following the bombardment of two targets, Sn120 and Ni60. Transition E2 matrix elements within the ground-state and octupole bands were measured up to 10ℏ and the results were consistent with a constant intrinsic electric-quadrupole moment, 518(11)efm2. The values of the intrinsic electric-octupole moment for the 0+→3- and 2+→5- transitions were found to be respectively 2360-210+300efm3 and 2300-500+300efm3 while a smaller value, 1200-900+500efm3, was found for the 2+→1- transition. In addition, four excited non-yrast states were identified in this work via γ-γ coincidences.

Original languageEnglish
Article number024323
JournalPhysical Review C
Volume105
Issue number2
DOIs
Publication statusPublished - 2022 Feb

Subject classification (UKÄ)

  • Subatomic Physics

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