With increasing neutron number, the size of a nucleus grows, subject to subtle effects that act as fingerprints of its internal structure. A fresh look at potassium calls for theory to decipher the details.

中文翻译：

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外来同位素的情况

随着中子数的增加，原子核的大小会增加，并受到微妙的影响，这些指纹会充当其内部结构的指纹。对钾的重新审视要求用理论来解释细节。