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Do nuclei go pear-shaped? Coulomb excitation of $^{220}$Rn and $^{224}$Ra at REX-ISOLDE(CERN)

M. Scheck L.P. Gaffney P.A Butler A.B. Hayes M. Albers B. Bastin 1 C. Bauer A. Blazhev S. Boenig N. Bree J. Cederkall T. Chupp D. Cline T.E. Cocolios T. Davinson H. De Witte J. Diriken T. Grahn A. Herzan M. Huyse D.G. Jenkins D.T. Joss N. Kesteloot J. Konki M. Kowalczyk Th. Kroell E. Kwan R. Lutter K. Moschner P. Napiorkowski J. Akarinen M. Pfeiffer D. Radeck P. Reiter K. Reynders S.V. Rigby L.M. Robledo M. Rudigier S. Sambi M. Seidlitz B. Siebeck T. Stora P. Thoele P. Van Duppen M.J. Vermeulen M. Von Schmid D. Voulot K. Wimmer K. Wrzosek-Lipska C. Y. Wu M. Zielinska 2
1 GANIL - Grand Accélérateur National d'Ions Lourds
2 CEA - Commissariat à l'énergie atomique et aux énergies alternatives
Abstract : The IS475 collaboration conducted Coulomb-excitation experiments with post-accelerated radioactive 220Rn and 224Ra beams at the REX-ISOLDE facility. The beam particles (Ebeam: 2.83 MeV/u) were Coulomb excited using 60Ni, 114Cd, and 120Sn scattering targets. De-excitation $\gamma$-rays were detected employing the Miniball array and scattered particles were detected in a silicon detector. Exploiting the Coulomb-excitation code GOSIA for each nucleus several matrix elements could be obtained from the measured $\gamma$-ray yields. The extracted ⟨3-||E3||0+⟩ matrix element allows for the conclusion that, while 220Rn represents an octupole vibrational system, 224Ra has already substantial octupole correlations in its ground state. This finding has implications for the search of CP-violating Schiff moments in the atomic systems of the adjacent odd-mass nuclei.
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Contributor : Michel Lion <>
Submitted on : Friday, October 24, 2014 - 10:32:47 AM
Last modification on : Friday, November 6, 2020 - 12:22:07 PM

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M. Scheck, L.P. Gaffney, P.A Butler, A.B. Hayes, M. Albers, et al.. Do nuclei go pear-shaped? Coulomb excitation of $^{220}$Rn and $^{224}$Ra at REX-ISOLDE(CERN). Fifteenth International Symposium on Capture Gamma-Ray Spectroscopy and Related Topics, Aug 2014, Dresden, Germany. pp.01038, ⟨10.1051/epjconf/20159301038⟩. ⟨in2p3-01077193⟩

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