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Collective structures of the 131Cs nucleus

  • R. Kumar
  • Kuljeet Singh
  • D. Mehta
  • Nirmal Singh
  • S. S. Malik
  • E. S. Paul
  • A. Görgen
  • S. Chmel
  • R. P. Singh
  • S. Muralithar
Article

Abstract.

The collective structures of 131Cs have been investigated by in-beam γ-ray spectroscopic techniques following the 124Sn (^11B , 4n) reaction at a beam energy Elab = 57MeV. The previously established rotational bands, built on πg7/2, πd5/2 and the unique-parity πh11/2 orbitals, have been extended and evolve into new bands involving rotationally aligned ν(h11/2)2 and π(h11/2)2 quasiparticles. In addition, a new multiquasiparticle band based on the πg7/2 ⊗ νg7/2 ⊗ νh11/2 configuration has also been observed. Theoretical interpretations for the assigned configurations are discussed in the framework of Total Routhian Surface (TRS) and Tilted Axis Cranking (TAC) model calculations. TAC model calculations predict a decrease in the B(M1) values with increasing rotational frequency for the πg7/2d5/2 ⊗ ν(h11/2)2 and πh11/2 ⊗ ν(h11/2)2 bands, thus indicating a magnetic rotation character for these bands.

PACS.

21.10.Re Collective levels 23.20.Lv γ transitions and level energies 21.60.-n Nuclear structure models and methods 27.60.+j 90 ⩽ A ⩽ 149 

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2005

Authors and Affiliations

  • R. Kumar
    • 1
  • Kuljeet Singh
    • 1
  • D. Mehta
    • 1
  • Nirmal Singh
    • 1
  • S. S. Malik
    • 2
  • E. S. Paul
    • 3
  • A. Görgen
    • 4
  • S. Chmel
    • 4
  • R. P. Singh
    • 5
  • S. Muralithar
    • 5
  1. 1.Department of PhysicsPanjab UniversityChandigarhIndia
  2. 2.Department of PhysicsGuru Nanak Dev UniversityAmritsarIndia
  3. 3.Oliver Lodge LaboratoryUniversity of LiverpoolUK
  4. 4.Helmholtz-Institut für Strahlen- und KernphysikUniversität BonnBonnGermany
  5. 5.Nuclear Science CentreAruna Asaf Ali MargNew DelhiIndia

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