柯林斯詞典branching /?brɑ?nt???/ 1. N the occurrence of several decay paths (branches) in the disintegration of a particular nuclide or the de-excitation of an excited atom. The branching fraction (nuclear) or branching ratio (atomic) is the proportion of the disintegrating nuclei that follow a particular branch to the total number of disintegrating nuclides 分支[physics] 返回 branching