Original Article

The European Physical Journal A - Hadrons and Nuclei

, Volume 26, Issue 2, pp 233-239

First online:

Energy systematics of low-lying Nilsson levels in odd-mass einsteinium isotopes

  • F. P. HeßbergerAffiliated withGesellschaft für Schwerionenforschung mbH
  • , S. AntalicAffiliated withDepartment of Nuclear Physics, Comenius University
  • , B. StreicherAffiliated withDepartment of Nuclear Physics, Comenius University
  • , S. HofmannAffiliated withGesellschaft für Schwerionenforschung mbHInstitut für Kernphysik, Johann Wolfgang Goethe-Universität
  • , D. AckermannAffiliated withGesellschaft für Schwerionenforschung mbHInstitut für Physik, Johannes Gutenberg-Universität
  • , B. KindlerAffiliated withGesellschaft für Schwerionenforschung mbH
  • , I. KojouharovAffiliated withGesellschaft für Schwerionenforschung mbH
  • , P. KuusiniemiAffiliated withGesellschaft für Schwerionenforschung mbHDepartment of Physics, University of Jyväskylä
  • , M. LeinoAffiliated withDepartment of Physics, University of Jyväskylä
    • , B. LommelAffiliated withGesellschaft für Schwerionenforschung mbH
    • , R. MannAffiliated withGesellschaft für Schwerionenforschung mbH
    • , K. NishioAffiliated withJapan Atomic Energy Research Institute (JAERI)Gesellschaft für Schwerionenforschung mbH
    • , S. SaroAffiliated withDepartment of Nuclear Physics, Comenius University
    • , B. SulignanoAffiliated withGesellschaft für Schwerionenforschung mbHInstitut für Physik, Johannes Gutenberg-Universität

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Abstract.

The decay of odd-mass mendelevium isotopes ( A = 247-255) has been studied by means of α-γ spectroscopy. Strong evidence for a small α branch in the decay of 253Md was found. γ lines in coincidence with α-decays of 247, 249, 251, 253Md have been observed for the first time. Levels in the einsteinium daughter nuclei were assigned on the basis of α-γ coincidence measurements. An energy systematics of the 7/2-[514] Nilsson level could be established, showing a correlation with the deformation parameter β2 of the corresponding nuclei. The results are compared with theoretical predictions

PACS.

23.60.+e α decay 27.90.+b 220 ⩽ A