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Spectroscopy and single-particle structure of the odd-Z heavy elements $^{255}$Lr, $^{251}$Md and $^{247}$Es

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 2f5/2 shell is discussed.
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Submitted on : Tuesday, October 10, 2006 - 1:06:20 PM
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A. Chatillon, Ch. Theisen, P.T. Greenlees, G. Auger, J.E. Bastin, et al.. Spectroscopy and single-particle structure of the odd-Z heavy elements $^{255}$Lr, $^{251}$Md and $^{247}$Es. European Physical Journal A, EDP Sciences, 2006, 30, pp.397-411. ⟨10.1140/epja/i2006-10134-5⟩. ⟨in2p3-00105118⟩



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