Eur. Phys. J. A (2005) 25: 397-404
https://doi.org/10.1140/epja/i2005-10117-0

Original Article

Decay studies of ^215-217Th using ER- γ- α- γ coincidences

¹ Gesellschaft für Schwerionenforschung mbH, D-64220, Darmstadt, Germany
² Department of Physics, University of Jyväskylä, FIN-40014, Jyväskylä, Finland
³ Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099, Mainz, Germany
⁴ Institut für Kernphysik, Johann Wolfgang Goethe-Universität, D-60486, Frankfurt am Main, Germany

^* e-mail: P.Kuusiniemi@gsi.de

Received: 5 April 2005
Accepted: 1 July 2005
Published online: 8 September 2005

Abstract

The decay of ^215-217Th was investigated by ER-γ-α-γ coincidence measurements. The nuclei were produced by the reaction ¹⁷⁰Er(⁵⁰Ti, xn)^220-xTh. Evaporation residues recoiling out of the target were separated in flight by the velocity filter SHIP and stopped in a position-sensitive 16-strip PIPS-detector in order to study their subsequent decays. Associated γ-rays were detected by a fourfold Ge-Clover detector. In the present work we extracted new and improved data for ^215-217Th including isomeric decays. The results are discussed and compared to previously published data.