https://doi.org/10.1140/epja/i2011-11062-y
Regular Article - Experimental Physics
Isomeric states in 253No and 253Fm
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
4
Institut für Kernphysik, Goethe-Universität, 60054, Frankfurt am Main, Germany
5
University of Jyväskylä, 40361, Jyväskylä, Finland
6
Advanced Science Research Center, Japan Atomic Energy Agency, 319-1195, Ibaraki, Japan
* e-mail: Stanislav.Antalic@fmph.uniba.sk
Received:
26
November
2010
Revised:
10
March
2011
Accepted:
13
April
2011
Published online:
20
May
2011
Nuclear structure and decay of isomeric states in 253No were investigated. The isotope was produced by the reaction 48Ca + 207Pb . The excitation energy of the known single-particle isomeric state ( 5/2+[622] was measured by delayed coincidences between γ-rays and implanted evaporation residues and was placed into the level scheme. In addition, decay of a high-lying multi-quasiparticle isomer in 253No was studied using e −-γ coincidence measurements. A rotational band populated by its de-excitation was identified in 253No . A new isomeric state in 253Fm was observed and a partial-level scheme for this isotope is suggested. In addition γ transitions from excited levels are reported for 253Md .
© SIF, Springer-Verlag Berlin Heidelberg, 2011
