原子内的一个中子衰变后会产生一个质子、一个电子和一个中微子。

When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino.

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这些物质被称作“放射性同位素”—同一种元素的变种，他们具有异常的中子数量，频繁的衰变和放出辐射。

These materials are known as "radioisotopes" -versions of an element that, because they have an abnormal number of neutrons, frequently decay and release radiation.

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反中子逃离大气，然后在高得多的区域衰变为反质子。

The antineutrons escape the atmosphere and then decay into antiprotons at much higher altitudes.

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