Coulomb excitation of 222Rn

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. KröllM. Lozano, B.S. Nara Singh, D. O'Donnell, J. Ojala, R. D. Page, L. G. Pedersen, C. Raison, P. Reiter, J.A. Rodriguez, 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

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Abstract

The nature of quadrupole and octupole collectivity in 222Rn was investigated by determining the electric-quadrupole ( E 2 ) and octupole ( E 3 ) matrix elements using subbarrier, multistep Coulomb excitation. The radioactive 222Rn 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, 120Sn and 60Ni . Transition E 2 matrix elements within the ground-state and octupole bands were measured up to 10 ℏ and the results were consistent with a constant intrinsic electric-quadrupole moment, 518 ( 11 ) e fm2 . The values of the intrinsic electric-octupole moment for the 0 + → 3 and 2 + → 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 + → 1 transition. In addition, four excited non-yrast states were identified in this work via γ − γ coincidences.
Original languageEnglish
Article number024323
Number of pages10
JournalPhysical Review C
Volume105
Issue number2
DOIs
Publication statusPublished - 22 Feb 2022

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