α activity of natural tungsten isotopes

@article{Danevich2003AO,
  title={$\alpha$ activity of natural tungsten isotopes},
  author={Fedor Danevich and A. Sh. Georgadze and V. V. Kobychev and S. S. Nagorny and A. S. Nikolaǐko and O. A. Ponkratenko and V. I. Tretyak and S. Yu. Zdesenko and Yu. G. Zdesenko and P. G. Bizzeti and T. F. Fazzini and Paolo Maurenzig},
  journal={Physical Review C},
  year={2003},
  volume={67},
  pages={014310}
}
The indication for the alpha decay of 180-W with a half-life T1/2=1.1+0.8-0.4(stat)+-0.3(syst)x10^18 yr has been observed for the first time with the help of the super-low background 116-CdWO_4 crystal scintillators. In conservative approach the lower limit on half-life of 180-W has been established as T1/2>0.7x10^18 yr at 90% C.L. Besides, new T1/2 bounds were set for alpha decay of 182-W, 183-W, 184-W and 186-W at the level of 10^20 yr. 
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