Coulomb excitation of re-accelerated ²⁰⁸Rn and ²⁰⁶Po beams

¹ Department of Physics, University of Jyväskylä, P. O. Box 35, FI-40014 Jyväskylä, Finland
² Helsinki Institute of Physics, P. O. Box 64, FI-00014, Helsinki, Finland
³ Institut für Kernphysik, Universität zu Köln, 50937 Köln, Germany
⁴ Wright Nuclear Structure Laboratory, Yale University, P.O. Box 208120, New Haven, CT 06520-8120, U.S.A.
⁵ Department of Physics, Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
⁶ Institut für Kernphysik, TU Darmstadt, 64289 Darmstadt, Germany
⁷ Instituut voor Kern- en Stralingsfysica, Department of Physics, KU Leuven, 3001 Leuven, Belgium
⁸ CERN-ISOLDE, PH Department, CERN, CH-1211 Geneva 23, Switzerland
⁹ CEA-Saclay, 91191 Gif-sur-Yvette, France
¹⁰ Institute of Physics, Slovak Academy of Sciences, Dubravska cesta 9, 845 11 Bratislava 45, Slovak Republic
¹¹ Department of Physics, University of York, Heslington, York, YO10 5DD, United Kingdom
¹² University of Geneva, Bd du Pont-d’Arve 40, 1211 Genéve, Switzerland

^a e-mail: tuomas.grahn@jyu.fi

Published online: 19 December 2013

Abstract

In the present study, B(E2; 2⁺ → 0⁺) values have been measured in the ²⁰⁸Rn and ²⁰⁶Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. The resulting B(E2; 2⁺ → 0⁺) in ²⁰⁸Rn is ∼ 0.08 e²b². These nuclei lie in, or at the boundary of the region where seniority scheme should persist. However, contributions from collective excitations may be present when moving away from the N = 126 shell closure. To date, surprisingly little is known of the transition probabilities between the low-spin states in this region.