α activity of natural tungsten isotopes

α activity of natural tungsten isotopes
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天然钨同位素的α活度

DOI:
10.1103/physrevc.67.014310
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发表时间:
2002
期刊:
影响因子:
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通讯作者:
P. R. Maurenzig
P. R. Maurenzig
中科院分区:
--
文献类型:
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作者:
F. Danevich;A. Georgadze;V. Kobychev;S. Nagorny;A. Nikolaǐko;O. Ponkratenko;V. Tretyak;S. Zdesenko;Y. Zdesenko;P. Bizzeti;T. Fazzini;P. R. Maurenzig

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利用超低本底116-CdWO_4晶体闪烁体,首次观测到了半衰期为T1/2=1.1+0.8-0.4(STAT)+-0.3(SYST)×10^18Yr的180-Wα衰变的迹象。在保守的方法中,180W的半衰期下限被确定为在90%C.L.时的t1/2>0.7×10^18年。此外,在10^20年的水平上,新的t1/2下限被设定为182-W、183-W、184-W和186-W的α衰变。
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.