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On the alpha activity of natural tungsten isotopes

F. A. Danevich, A. Sh. Georgadze, V. V. Kobychev, S. S. Nagorny, A. S. Nikolaiko, O. A. Ponkratenko, V. I. Tretyak, S. Yu. Zdesenko, Yu. G. Zdesenko, P. G. Bizzeti, T. F. Fazzini, P. R. Maurenzig

nucl-exarXiv:nucl-ex/0211013

Abstract

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)x1018 yr has been observed for the first time with the help of the super-low background 116-CdWO4 crystal scintillators. In conservative approach the lower limit on half-life of 180-W has been established as T1/2>0.7x1018 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 1020 yr.

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