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Il Nuovo Cimento A (1971-1996)

, Volume 111, Issue 6–7, pp 685–690 | Cite as

High-spin studies of164Lu using EUROBALL

  • S. Törmänen
  • G. B. Hagemann
  • A. Harsmann
  • M. Bergström
  • R. A. Bark
  • B. Herskind
  • G. Sletten
  • S. W. Ødegård
  • P. O. Tjøm
  • A. Görgen
  • H. Hübel
  • B. Aengenvoort
  • U. J. Van Severen
  • H. Ryde
  • C. Fahlander
  • D. Napoli
  • S. Lenzi
  • C. Petrache
  • C. Ur
  • H. J. Jensen
  • A. Bracco
  • S. Frattini
  • R. Chapman
  • D. M. Cullen
  • S. L. King
Article
  • 18 Downloads

Summary

A new region of superdeformed shapes with a pronounced triaxiality coexisting with normal deformation exists for nuclei withN ~ 94 andZ ~ 71. Calculations with the Ultimate Cranker have revealed that triaxial SD minima with γ ~ ±20° are expected for all symmetry groups (π, α). In an odd-odd nucleus, the possibility exists to exploit the various combinations of proton and neutron orbitals which are expected to sample the triaxial minima differently. A search for such structures was performed as one of the first Euroball experiments using the reaction139La(29Si,4n) with thin self-supporting targets at a beam energy of 145 MeV, provided by the Legnaro XTU tandem accelerator. The preliminary analysis has provided a major extension of the known (normal deformed) level scheme in164Lu, in addition to ~7 new, presumably triaxial, SD bands in164Lu. These bands have dynamical moments of inertia similar to those found in163,165Lu. The new data are compared to expectations from calculations with the code “Ultimate Cranker”.

PACS 21.10

Properties of nuclei nuclear energy levels 

PACS 23.20.Lv

Gamma transitions and level energies 

PACS 25.70

Low and intermediate energy heavy-ion reactions 

PACS 27.70

150 < A < 189 

PACS 01.30.Cc

Conference proceedings 

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References

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    Åberg S.,Nucl. Phys A,520 (1990) 35c andReferences therein. CrossRefADSGoogle Scholar
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    Schnack-Petersen H. et al., Nucl. Phys. A,594 (1995) 175.CrossRefADSGoogle Scholar
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    Schmitz W. et al., Phys. Lett. B,303 (1993) 230.CrossRefADSGoogle Scholar
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    Yang C. X. et al., Eur. Phys. J. A,1 (1998) 237.CrossRefADSGoogle Scholar
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    Wang X.-H. et al., Nucl. Phys. A,608 (1996) 77;Cardona M. A. et al.,Phys. Rev. C,56 (1997) 707.CrossRefADSGoogle Scholar

Copyright information

© Società Italiana di Fisica 1998

Authors and Affiliations

  • S. Törmänen
    • 1
  • G. B. Hagemann
    • 1
  • A. Harsmann
    • 1
  • M. Bergström
    • 1
  • R. A. Bark
    • 1
  • B. Herskind
    • 1
  • G. Sletten
    • 1
  • S. W. Ødegård
    • 2
  • P. O. Tjøm
    • 2
  • A. Görgen
    • 3
  • H. Hübel
    • 3
  • B. Aengenvoort
    • 3
  • U. J. Van Severen
    • 3
  • H. Ryde
    • 4
  • C. Fahlander
    • 4
    • 5
  • D. Napoli
    • 5
  • S. Lenzi
    • 6
  • C. Petrache
    • 6
  • C. Ur
    • 6
  • H. J. Jensen
    • 1
    • 7
  • A. Bracco
    • 8
  • S. Frattini
    • 8
  • R. Chapman
    • 9
  • D. M. Cullen
    • 10
  • S. L. King
    • 10
  1. 1.Niels Bohr InstituteTandem Accelerator LaboratoryRoskildeDenmark
  2. 2.Department of PhysicsUniversity of OsloOsloNorway
  3. 3.University of Bonn, ISKPBonnGermany
  4. 4.Department of PhysicsUniversity of LundLundSweden
  5. 5.INFN, Laboratori Nazionali di LegnaroLegnaroItaly
  6. 6.Department of Physics and INFNUniversity of PadovaPadovaItaly
  7. 7.KFAJülichGermany
  8. 8.Department of PhysicsUniversity of MilanMilanItaly
  9. 9.Department of PhysicsUniversity of PaisleyPaisleyScotland
  10. 10.Department of PhysicsUniversity of LiverpoolUK

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