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Four factor formula : ウィキペディア英語版
Four factor formula
The four-factor formula, also known as Fermi's four factor formula is used in nuclear engineering to determine the multiplication of a nuclear chain reaction in an infinite medium. The formula is
k_ = \eta f p \varepsilon

}
| \eta = \frac
|-
| f
| The thermal utilization factor
|
\frac}

| f = \frac
|-
| p
| The resonance escape probability
|
\frac}

| p \approx \mathrm \left( -\frac N_i I_}} \right)
|-
| \epsilon
| The fast fission factor
|
\frac}

| \varepsilon \approx 1 + \frac\frac P_}
|-
|}
The six factor formula defines each of these terms in much more detail.
==Multiplication==
The multiplication factor, k, is defined as (see Nuclear chain reaction):
k = \frac}

If k is greater than 1, the chain reaction is ''supercritical,'' and the neutron population will grow exponentially.

If k is less than 1, the chain reaction is ''subcritical,'' and the neutron population will exponentially decay.

If k = 1, the chain reaction is ''critical'' and the neutron population will remain constant.
In an infinite medium, neutrons cannot leak out of the system and the multiplication factor becomes the infinite multiplication factor, k = k_, which is approximated by the four-factor formula.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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