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汉语拼音：shuāi biàn

大量的同种原子核因具有放射性而发生转变，使处于原状态的核数目不断减少的过程。不稳定的粒子自发地转变为新粒子的过程也叫衰变。

1. 衰落变化。

   唐 玄奘 《大唐西域记·吠舍厘国》：“有七宝应，王四天下，覩衰变之相，体无常之理。” 宋 苏轼 《无题》诗：“年光与时景，顷刻互衰变。”

2. 放射性元素放射出粒子后变成另一种元素的现象。也叫蜕变。

• "There was active-enough chemistry in the sediments that the decay process didn't occur as quickly as the mineralization process, " he said.

  “沉积物中有积极的，足够的化学物质，（它的）衰变过程没有同成矿过程一样快，”他说。

• It had been used for practical ends, to identify elements and to unravel radioactive decay chains.

  已将其用于实践的目的，去鉴别元素和阐明放射性衰变系。

• Let us calculate first how much energy is released when a free neutron decays.

  让我们首先来计算一个自由中子的衰变会释放出多少能量。

• Exactly what has scientists so on edge is the fact that the natural rate of decay of atomic particles has always been predictable.

  确切的说，令科学家们如此紧张不安的是，原子微粒的自然衰变率曾经一直是可预测的。

• Others call it a shout-out to the man who studied microbial decay, brought you spoilage-resistant milk and found a vaccine for rabies.

  还有人认为把这认为是巴斯德的一种留言或者是警示，而巴斯德研究微生物衰变，并为我们研究出了抗腐败牛奶以及发现了狂犬疫苗。

• Some of these particles are stable and form the normal matter, the others live for fractions of a second and then decay to the stable ones.

  这些粒子中的一部分是稳定的并且构成了普通物质，其它的只存在一秒钟的几分之一，然后衰变为稳定粒子。

• The Higgs should occasionally decay into a pair of photons, which would produce a bump in the photon-pair energy distribution.

  偶尔，玻色子会衰变为一对光子，光子纠缠对能量分布不均可能产生效应。

• She also said that the experiment had another part, involving _two_ universes around the choice point of the time of decay of the atom.

  她还说，这个实验还有另外一个部分，是关于在原子衰变的刹那间的两个宇宙。

• Transport of a two-member decay chain of radionuclides through a discrete fracture in a porous rock matrix in the presence of colloids.

  放射性核素双数衰变链通过胶体中多孔岩石基质不连续断裂的输运…[中国核科技信息与经济研究院]。