https://doi.org/10.1140/epja/i2015-15041-0
Regular Article - Experimental Physics
Nuclear isomers in 259Sg and 255Rf
1
Department of Nuclear Physics and Biophysics, Comenius University, 84248, Bratislava, Slovakia
2
GSI-Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
3
Helmholtz Institut Mainz, 55099, Mainz, Germany
* e-mail: Stanislav.Antalic@fmph.uniba.sk
Received:
22
July
2014
Revised:
18
February
2015
Accepted:
17
March
2015
Published online:
14
April
2015
The production and radioactive decay of 259Sg and its daughter products were investigated using α-decay spectroscopy and spontaneous-fission measurements. The isotope was produced in the fusion-evaporation reaction 206Pb(54Cr, 1n)259Sg. This work presents first results for isomeric states in the isotopes 259Sg and 255Rf. In addition new results for spontaneous-fission properties and branching ratios of both isotopes are discussed. The new decay-spectroscopy data allowed extending the single-particle systematics of isotones with 151 and 153 neutrons. A change of the ground-state configuration in N = 153 isotones from 1/2+[620] to 11/2−[725] was observed for the first time.
© SIF, Springer-Verlag Berlin Heidelberg, 2015