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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 f2un t = 16.45 ± 0.12. The intensity of the possible E 5 transition at 378.3 keV is estimated to be < 0.9 × 10-4%. The technique for determining the values of log f2un 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 Iβ ≈ 0.1% of the number of decays of 129I.
Original language | English |
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Pages (from-to) | 827-831 |
Number of pages | 5 |
Journal | Bulletin of the Russian Academy of Sciences: Physics |
Volume | 71 |
Issue number | 6 |
DOIs | |
State | Published - 30 Jul 2007 |
ID: 51040296