https://doi.org/10.1140/epja/i2004-10077-9
Alpha-decay of neutron-deficient 200Fr and heavier neighbours
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
* e-mail: hilde.dewitte@fys.kuleuven.ac.be
Received:
15
April
2004
Accepted:
24
September
2004
Published online:
16
December
2004
A new measurement of the 200Fr α-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 α branching ratio b α = 94(5)% were measured. In addition, the half-lives of 201, 203, 205Fr and 197,199At are reported.
PACS: 23.60.+e α decay – / 27.80.+w 190 ⩽ A ⩽ 219 –
© Società Italiana di Fisica and Springer-Verlag, 2005