https://doi.org/10.1140/epja/i2016-16340-6
Regular Article - Experimental Physics
Collective 2+ 1 excitations in 206Po and 208,210Rn
1
University of Jyvaskyla, Department of Physics, P.O. Box 35, FI-40014, Jyvaskyla, 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
Institut für Kernphysik, TU Darmstadt, 64289, Darmstadt, Germany
5
Wright Nuclear Structure Laboratory, Yale University, P.O. Box 208120, 06520-8120, New Haven, CT, USA
6
Department of Physics, Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
7
Université de Genève, 24 Quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
8
Instituut voor Kern- en Stralingsfysica, Department of Physics, KU Leuven, 3001, Leuven, Belgium
9
School of Engineering, University of the West of Scotland, PA1 2BE, Paisley, UK
10
CERN-ISOLDE, PH Department, CERN, CH-1211, Geneva 23, Switzerland
11
CEA-Saclay, 91191, Gif-sur-Yvette, France
12
Institute of Physics, Slovak Academy of Sciences, Dubravska cesta 9, 845 11, Bratislava 45, Slovakia
13
Department of Physics, University of York, YO10 5DD, York, UK
* e-mail: tuomas.grahn@jyu.fi
Received:
29
July
2016
Accepted:
28
October
2016
Published online:
22
November
2016
In the present study, values have been measured in the 208,210Rn and 206Po nuclei through Coulomb excitation of re-accelerated radioactive beams in inverse kinematics at CERN-ISOLDE. These nuclei have been proposed to lie in, or at the boundary of the region where the seniority scheme should persist. However, contributions from collective excitations are likely to be present when moving away from the N=126 closed shell. Such an effect is confirmed by the observed increased collectivity of the
transitions. Experimental results have been interpreted with the aid of theoretical studies carried out within the BCS-based QRPA framework.
© SIF, Springer-Verlag Berlin Heidelberg, 2016