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Physical Review Letters 102 (2009) 212501
Gamma-Ray Spectroscopy at the Limits: First Observation of Rotational Bands in 255Lr
S. Ketelhut, P.T. Greenlees, D. Ackermann, S. Antalic, E. Clement1, I.G. Darby, O. Dorvaux2, A. Drouart1, S. Eeckhaudt, B.J.P. Gall2, A. Gorgen1, T. Grahn, C. Gray-Jones, K. Hauschild3, R.D. Herzberg, F.P. Hessberger, U. Jakobsson, G.D. Jones, P. Jones, R. Julin, S. Juutinen, T.L. Khoo, W. Korten1, M. Leino, A.P. Leppaanen, J. Ljungvall1, S. Moon, M. Nyman, A. Obertelli1, J. Pakarinen, E. Parr, P. Papadakis, P. Peura, J. Piot2, A. Pritchard, P. Rahkila, D. Rostron, P. Ruotsalainen, M. Sandzelius, J. Saren, C. Scholey, J. Sorri, A. Steer, B. Sulignano1, C. Theisen1, J. Uusitalo, M. Venhart, M. Zielinska, M. Bender4, P.H. Heenen

The rotational band structure of 255Lr has been investigated using advanced in-beam gamma-ray spectroscopic techniques. To date, 255Lr is the heaviest nucleus to be studied in this manner. One rotational band has been unambiguously observed and strong evidence for a second rotational structure was found. The structures are tentatively assigned to be based on the 1/2;{-}[521] and 7/2;{-}[514] Nilsson states, consistent with assignments from recently obtained alpha decay data. The experimental rotational band dynamic moment of inertia is used to test self-consistent mean-field calculations using the Skyrme SLy4 interaction and a density-dependent pairing force.
1 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
2 :  IPHC - Institut Pluridisciplinaire Hubert Curien
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
4 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
Physique/Physique Nucléaire Théorique