# Spectroscopy of the odd transfermium $^{251}$Md and $^{255}$Lr nuclei using $\gamma$, electron and $\alpha$ spectroscopy

Abstract : A rotational band has been observed in 251Md using RITU and the $\gamma$-ray spectrometer Jurogam at the University of Jyvaskyla. Interpreted as having a 1/2- configuration, this is the first firmly established rotational band in an odd-Z transfermium nucleus. In order to disentangle the single-particle structure, the $\alpha$ decay of 255Lr has been studied both at Jyvaskyla and at GANIL. From the preliminary analysis, we have observed for the first time the $\alpha$ decay fine structure of 251Md and two excited states in 247Es. Four $\alpha$ lines from the 255Lr decay have been observed, originating from two initial states, which establishes the ordering of the levels.
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Submitted on : Friday, December 15, 2006 - 12:09:50 PM
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• HAL Id : in2p3-00025447, version 1

### Citation

A. Chatillon, Ch. Theissen, E. Bouchez, E. Clément, R. Dayras, et al.. Spectroscopy of the odd transfermium $^{251}$Md and $^{255}$Lr nuclei using $\gamma$, electron and $\alpha$ spectroscopy. International Symposium on Exotic Nuclei (EXON 2004), Jul 2004, Peterhof, Russia. pp.198-205. ⟨in2p3-00025447⟩

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