Barn - barn (English spelling)

Japanese: バーン - ばーん(英語表記)barn
Barn - barn (English spelling)

In nuclear physics, it is the unit of cross section of the probability of collision of each particle when atomic nuclei or elementary particles collide with each other. It is adopted as one of the "other non-SI units" in the International System of Units (SI). The symbol is b. Since the radius of an atomic nucleus is about 10 -14 meters, its cross section is about 10 -28 square meters.

1b= 100-28 m2
When an incident atomic nucleus passes through a substance, atomic processes such as absorption, fission, and scattering occur. The barn is a unit that measures this probability. This name was first used in the United States in 1942.

[Koizumi Kesakatsu and Imai Hidetaka]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

Japanese:

原子核物理学において、原子核や素粒子が相互に衝突する場合の、各粒子の衝突確率の断面積の単位。国際単位系(SI)においては「その他の非SI単位」の一つとして採用されている。記号はb。原子核の半径は10-14メートル程度であるから、その断面積は10-28平方メートル程度になる。

  1b=100-28m2
入射原子核が物質中を通過するとき、吸収、分裂、散乱などの原子核過程がおこる。バーンはこの確率の目安となる単位である。この名称は1942年アメリカで初めて用いられた。

[小泉袈裟勝・今井秀孝]

出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例

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