https://doi.org/10.1140/epja/i2012-12075-8
Regular Article - Experimental Physics
Alpha-gamma decay studies of 253No and its daughter products 253Md , 249Fm
1
GSI, Helmholtzzentrum für Schwerionenforschung GmbH, 64291, Darmstadt, Germany
2
Helmholtz Institut Mainz, 55099, Mainz, Germany
3
Department of Nuclear Physics and Biophysics, Comenius University, 84248, Bratislava, Slovakia
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, Tokai, 319-1195, Ibaraki, Japan
Received:
23
January
2012
Accepted:
17
April
2012
Published online:
29
May
2012
Nuclear structure and decay of the isotope 253No and its decay products 249Fm and 253Md were investigated by means of -
spectroscopy. Besides the established strong
transitions from the
Nilsson level in 249Fm , populated predominantly by the
decay of 253No , into the ground-state (gs) rotational band, a couple of weaker
lines (58.3, 129.2, 209.3 and 669.5keV) were observed and placed into the 249Fm level scheme. The transition from the
level in 249Es , populated by the
decay of 253Md , into the
member of the gs rotational band, so far established for other odd-mass Es isotopes, was observed clearly. GEANT4 simulations were performed to investigate the influence of energy summing between
particles and conversion electrons (CE) on the shape of the
spectra at different implantation energies, leading to evidence for a weak
decay branch of 253No into the gs of 249Fm or the ground-state rotational band, respectively.
© SIF, Springer-Verlag Berlin Heidelberg, 2012