Coexisting normal and triaxial superdeformed structures in $^165Lu$

G. Schönwasser, N. Nenoff, H. Hübel, G.B. Hagemann, P. Bednarczyk, G. Benzoni, A. Bracco, P. Bringel, R. Chapman, D. Curien, J. Domscheit, B. Herskind, D.R. Jensen, S. Leoni, G. Lo Bianco, W.C. Ma, A. Maj, A. Neusser, S.W. Ødegård, C.M. PetracheD. Rossbach, H. Ryde, A.K. Singh, K.H. Spohr

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Abstract

High-spin states in 165Lu were populated in the 139La(30Si,4n) reaction at a beam energy of 152 MeV and γ-ray coincidences were measured with the EUROBALL spectrometer array. Nine new rotational bands were discovered, known band structures were considerably extended and many inter-band transitions were found. Structures with normal deformation coexist with bands associated with the strongly deformed triaxial energy minima found in calculations. Three of these triaxial bands form a family of wobbling excitations with phonon quanta nw=0, 1 and 2. The wobbling mode is a unique signature of nuclear triaxiality. Configuration assignments are discussed for the observed band structures. An exchange of configuration between two of the new bands due to mixing is observed, resulting in different signature partnerships at low and high spins.
Original languageEnglish
Pages (from-to)393-424
Number of pages32
JournalNuclear Physics A
Volume735
Issue number3-4
DOIs
Publication statusPublished - 3 May 2004

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Keywords

  • Nuclear reactions139La(30Si,4n)
  • E=152 MeV
  • measured, Eγ
  • γγ-coin
  • 165Lu deduced, high-spin levels
  • J
  • π
  • configurations
  • shape coexistence
  • triaxial deformation
  • Euroball array

Cite this

Schönwasser, G., Nenoff, N., Hübel, H., Hagemann, G. B., Bednarczyk, P., Benzoni, G., Bracco, A., Bringel, P., Chapman, R., Curien, D., Domscheit, J., Herskind, B., Jensen, D. R., Leoni, S., Lo Bianco, G., Ma, W. C., Maj, A., Neusser, A., Ødegård, S. W., ... Spohr, K. H. (2004). Coexisting normal and triaxial superdeformed structures in $^165Lu$. Nuclear Physics A, 735(3-4), 393-424. https://doi.org/10.1016/j.nuclphysa.2004.02.006