Eur. Phys. J. A (2005) 26: 233-239
https://doi.org/10.1140/epja/i2005-10171-6

Original Article

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

¹ Gesellschaft für Schwerionenforschung mbH, D-64220, Darmstadt, Germany
² Department of Nuclear Physics, Comenius University, SK-84215, Bratislava, Slovakia
³ Institut für Kernphysik, Johann Wolfgang Goethe-Universität, D-60054, Frankfurt am Main, Germany
⁴ Institut für Physik, Johannes Gutenberg-Universität, D-55099, Mainz, Germany
⁵ Department of Physics, University of Jyväskylä, FIN-40361, Jyväskylä, Finland
⁶ Japan Atomic Energy Research Institute (JAERI), 319-1195, Tokai, Ibaraki, Japan

Received: 1 August 2005
Accepted: 14 November 2005
Published online: 8 December 2005

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, 253}Md 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