https://doi.org/10.1140/epja/i2003-10238-4
Alpha-gamma decay studies of 251, 253No and their daughter products 247, 249Fm
1
Gesellschaft für Schwerionenforschung mbH, D-64220, Darmstadt, Germany
2
Institut für Physik, Johannes Gutenberg - Universität Mainz, D-55099, Mainz, Germany
3
Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
4
Department of Physics, University of Jyväskylä, FIN-40361, Finland
Received:
1
December
2003
Accepted:
27
June
2004
Published online:
9
November
2004
The isotopes 251No and 253No were produced in nuclear reactions 206Pb( 48Ca,3n) 251No and 207Pb( 48Ca,2n) 253No. Radioactive decay of these isotopes and their daughter products has been investigated by means of α- and α-γ- spectroscopy. An isomeric state 251mNo, having a half-life of T 1/2 = (0.93±0.06) s and decaying by emission of α particles of E α = (8665±8) keV was identified. The measured decay data allowed for the construction of partial level schemes for 251No, 247, 249Fm and 243, 245Cf and an extrapolation of energy systematics of single particle levels of N = 145, 147 and 149 isotones with even Z towards higher atomic numbers up to Z = 102.
PACS: 23.60.+e α decay – / 27.90.+b 220 ⩽ A – / 21.10.-k Properties of nuclei; nuclear energy levels –
© Società Italiana di Fisica and Springer-Verlag, 2004