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Unique second-forbidden β transitions: Decay of 137Cs

  • Proceedings of the LVI International Conference On Nuclear Spectroscopy and Nuclear Structure “NUCLEUS-2006”
  • Published:
Bulletin of the Russian Academy of Sciences: Physics Aims and scope

Abstract

The intensity of the 283.4-keV γ line in the decay of 137Cs has been measured. The value obtained is used to determine the probability of the unique second-forbidden β transition of the 7/2+ → 1/2+ type: (8.7 ± 2.0) × 10−4% of the number of decays; this value corresponds to log f un2 t = 16.45 ± 0.12. The intensity of the possible E5 transition at 378.3 keV is estimated to be < 0.9 × 10−4%. The technique for determining the values of log f un2 t in calculations of the tensor matrix elements in the Cartesian and spherical coordinate systems is discussed. The possible intensity of the unique second-forbidden β transition between the ground states of 129I and 129Xe is estimated to be I β ≈ 0.1% of the number of decays of 129I.

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Authors and Affiliations

  1. St. Petersburg Nuclear Physics Institute, Russian Academy of Sciences, Gatchina, Leningrad oblast, 188350, Russia

    V. O. Sergeev & F. F. Valiev

Authors
  1. V. O. Sergeev
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  2. F. F. Valiev
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Original Russian Text © V.O. Sergeev, F.F. Valiev, 2007, published in Izvestiya Rossiiskoi Akademii Nauk. Seriya Fizicheskaya, 2007, Vol. 71, No. 6, pp. 854–858.

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Sergeev, V.O., Valiev, F.F. Unique second-forbidden β transitions: Decay of 137Cs. Bull. Russ. Acad. Sci. Phys. 71, 827–831 (2007). https://doi.org/10.3103/S1062873807060159

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  • DOI: https://doi.org/10.3103/S1062873807060159

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