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Briselet, R; Theisen, Ch; Sulignano, B; Airiau, M; Auranen, K; Cox, D M; Déchery, F; Drouart, A; Favier, Z; Gall, B; Goigoux, T; Grahn, T; Greenlees, P T; Hauschild, K; Herzan, A; R -D Herzberg; Jakobsson, U; Julin, R; Juutinen, S; Konki, J; Leino, M; Lopez-Martens, A; Mistry, A; Nieminen, P; Pakarinen, J; Papadakis, P; Peura, P; Rahkila, P; Rey-Herme, E; Rubert, J; Ruotsalainen, P; Sandzelius, M; Sarén, J; Scholey, C; Sorri, J; Stolze, S; Uusitalo, J; Vandebrouck, M; Ward, A; Zielińska, M; Bally, B; Bender, M; Ryssens, W
arXiv.org, 07/2020Paper, Journal Article
The odd-\(Z\) \(^{251}\)Md nucleus was studied using combined \(\gamma\)-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the \(5211/2^-\) configuration, another rotational structure has been identified using \(\gamma\)-\(\gamma\) coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a \(5147/2^-\) single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of \(\simeq\) 60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely \(g_K = 0.69^{+0.19}_{-0.16}\) for the ground-state band. The odd-\(Z\) \(^{249}\)Md was studied using \(\gamma\)-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the \(\Delta l = \Delta j = 3\) \(5213/2^-\) and \(6337/2^+\) Nilsson orbitals were found in both \(^{249,251}\)Md. A surprising similarity of the \(^{251}\)Md ground-state band transition energies with those of the excited band of \(^{255}\)Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands.
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