| Institution: | (1) Instituut voor Kern- en Stralingsfysica, K.U. Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium;(2) Department of Physics, Oliver Lodge Laboratory, University of Liverpool, P.O. Box 147, L697ZE Liverpool, UK;(3) Institut für Physik, Johannes Gutenberg-Universität Mainz, D-55099 Mainz, Germany;(4) ISOLDE, CERN, CH-1211 Genève, Switzerland;(5) Institute of Experimental Physics, Warsaw University, Hoza 69, PL-00681 Warsaw, Poland |
| Abstract: | A new measurement of the 200Fr  -decay half-life, with improved accuracy compared to previous measurements, has been carried out at the Isolde-CERN on-line mass separator. A half-life of 49(4) ms has been obtained, which is substantially different from earlier literature values. For the 196At daughter decay, a half-life of 389(54) ms and an branching ratio b = 94(5)% were measured. In addition, the half-lives of 201, 203, 205Fr and 197,199At are reported. |
