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宇宙核钟
Authors
戴光曦,孙志虹
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Abstract
以很长半衰期 ( 4 2× 1 0 9a)的 β-衰变的 187Re- 187Os核对作为大尺度的宇宙核钟来量度宇宙的年纪 ,是近代天文学与核物理学相结合的又一典范 .这种宇宙时钟是利用裸核 187Re与它的衰变子体 187Os同位素在共生矿中天然含量的比值来测定时间的 .利用 187Re裸核的半衰期通过核物理计算可对中性 187Re的半衰期进行修
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Last time updated on 24/05/2016