An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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branching ratio
  وابر ِ شاخه‌زد  
vâbar-e šâxé-zad
Fr.: rapport de branchement  

A quantity used to describe a → radionuclide that has more than one → decay mode.
For a particular decay mode, the ratio of the number of atoms decaying by that decay mode to the number decaying in total:

BRi = ki/(k1 + k2 + …) = ki/k, where k is → decay constant.

See also: → branching; → ratio.