, Volume 61, Issue 6, pp 1157–1162 | Cite as

Observation of high spin levels in131Cs from131Ba decay

  • M. Sainath
  • Dwaraka Rani Rao
  • K. Venkataramaniah
  • P. C. Sood


The γ- and conversion electron spectra following131Ba ε-decay are investigated, using HPGe detector and mini-orange electron spectrometer. Attention is particularly focussed on identifying weak transitions associated with low energy high spin levels in131Cs level scheme earlier inferred in reaction studies but not yet observed in131Ba decay. Our experiment identifies 15 new gammas and 6 new conversion lines in this decay. Internal conversion coefficients and multipolarities of several transitions are determined. Five new levels (3 with Iπ = 7/2+ and one each with Iπ 9/2+ and 11/2) are introduced in the131Cs level scheme based on our observations taken together with the results from reaction studies. Spin-parity assignments to a few other levels are also suggested


Radioactivity 131Ba beta decay γ and ce measured HPGe miniorange internal conversion coefficient multipolarities 131Cs level scheme 


23.20.Lv 23.20.Nx 27.60.+j 


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Copyright information

© Indian Academy of Sciences 2003

Authors and Affiliations

  • M. Sainath
    • 1
  • Dwaraka Rani Rao
    • 1
  • K. Venkataramaniah
    • 1
  • P. C. Sood
    • 1
  1. 1.Department of PhysicsSri Sathya Sai Institute of Higher LearningPrasanthinilayamIndia

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