The half-life of 128Te relative to the half-life of 130Te has been found to be t12128t12130=(1.59±0.05)×103 by measurement of the ββ-decay products, 128Xe and 130Xe, in a geologically old (2.4×109 yr) telluride ore. These results yield an upper limit on the lepton nonconservation parameter, η≤0.8×10-4. RADIOACTIVITY ββ-decay 128Te; measured T1/2=1.5×1024 yr; deduced η≤0.8×10-4. Detected excess 128Xe in old Te ore.
E. W. Hennecke et al., "Double beta decay of 128Te," Physical Review C - Nuclear Physics, vol. 11, pp. 1378-1384, American Physical Society, Apr 1975.
The definitive version is available at https://doi.org/10.1103/PhysRevC.11.1378
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