Abstract.
The odd-Z isotope 255Lr, its daughter 251Md and grand-daughter 247Es were studied in two experiments performed at GANIL and the University of Jyväskylä. The 255Lr nuclei were produced using the cold fusion-evaporation reaction 209Bi(48Ca, 2n)255Lr at a bombarding energy of 217MeV. The single-particle structure and decay properties were investigated using α, γ and electron spectroscopy. The ground-state spin and parity could be assigned for 255Lr (1/2-) and 251Md (7/2-). States corresponding to the 7/2+[633], 7/2-[514] and 1/2-[521] Nilsson orbitals were observed. Results are compared to experimental data obtained in neighbouring isotopes and to Hartree-Fock-Bogoliubov calculations using the Skyrme interaction SLy4 and a density-dependent pairing interaction. The position of the 1/2-[521] orbital from the spherical 2f 5/2 shell is discussed.
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Chatillon, A., Theisen, C., Greenlees, P.T. et al. Spectroscopy and single-particle structure of the odd- Z heavy elements 255Lr, 251Md and 247Es. Eur. Phys. J. A 30, 397–411 (2006). https://doi.org/10.1140/epja/i2006-10134-5
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DOI: https://doi.org/10.1140/epja/i2006-10134-5