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・ Branchinectidae
・ Branchinella
・ Branchinella alachua
・ Branchinella apophysata
・ Branchinella basispina
・ Branchinella denticulata
・ Branchinella lithaca
・ Branchinella ornata
・ Branchinella simplex
・ Branchinella spinosa
・ Branchinella wellardi
・ Branching (linguistics)
・ Branching (polymer chemistry)
・ Branching (version control)
・ Branching factor
Branching fraction
・ Branching identification key
・ Branching order of bacterial phyla (Battistuzzi et al., 2004)
・ Branching order of bacterial phyla (Cavalier-Smith, 2002)
・ Branching order of bacterial phyla (Ciccarelli et al., 2006)
・ Branching order of bacterial phyla (Gupta, 2001)
・ Branching order of bacterial phyla (Rappe and Giovanoni, 2003)
・ Branching order of bacterial phyla (Woese, 1987)
・ Branching Out
・ Branching process
・ Branching quantifier
・ Branching random walk
・ Branching theorem
・ Branchio-oculo-facial syndrome
・ Branchio-oto-renal syndrome


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Branching fraction : ウィキペディア英語版
Branching fraction
In particle physics and nuclear physics, the branching fraction for a decay is the fraction of particles which decay by an individual decay mode with respect to the total number of particles which decay. It is equal to the ratio of the partial decay constant to the overall decay constant. Sometimes a partial half-life is given, but this term is misleading; due to competing modes it is not true that half of the particles will decay through a particular decay mode after its partial half-life. The partial half-life is merely an alternate way to specify the partial decay constant λ, the two being related through:
:t_ = \frac.
For example, for spontaneous decays of 132Cs, 98.1% are ε or β+ decays, and 1.9% are β decays. The partial decay constants can be calculated from the branching fraction and the half-life of 132Cs (6.479 d), they are: 0.10 d−1 (ε + β+) and .0020 d−1). The partial half-lives are 6.60 d (ε + β+) and 341 d (β). Here the problem with the term partial half-life is evident: after (341+6.60) days almost all the nuclei will have decayed, not only half as one may initially think.
Isotopes with significant branching of decay modes include copper-64, arsenic-74, rhodium-102, indium-112, iodine-126 and holmium-164.
== References ==


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