这种原子通过释放射线从不稳定状态变到更加稳定的状态的过程被称为核衰减或放射。

The process by which an atom changes from an unstable state to a morestable state by emittingradiation is called radioactive decay or radioactivity.

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但有时宇宙射线会撞击氮原子，赋予它一个额外的中子。

But sometimes a cosmic ray will collide with a nitrogen atom, giving it an extra neutron.

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科学家们首次将注意力转向亚原子微粒(包括宇宙射线)，并使用一种名为“云室”的装置对其进行研究。

When scientists first turned their attention to subatomic particles, including cosmic rays, they used a device called a cloud chamber to study them.

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