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词汇 Neutron multiplication factor
分类 英语词汇 英语翻译词典
释义

Neutron multiplication factor

中文百科

核连锁反应 Nuclear chain reaction

（重定向自Neutron multiplication factor）

核连锁反应是当发生一个核反应，两个或以上的周边核反应被触动，从而带动其他核反应以指数形式增长。

在临界质量的核裂变燃料发生的不受控核连锁反应可释放出巨大能量，也是核武的概念，而连锁反应可通过控制，成为日常所需的能源。

唯一已知的自然核连锁反应堆位于西非加蓬共和国的奥克洛（Oklo），该处有一个长达20亿年历史的古老核反应堆。

英语百科

Nuclear chain reaction 核连锁反应

（重定向自Neutron multiplication factor）
A possible nuclear fission chain reaction. 1. A uranium-235 atom absorbs a neutron, and fissions into two new atoms (fission fragments), releasing three new neutrons and a large amount of binding energy. 2. One of those neutrons is absorbed by an atom of uranium-238, and does not continue the reaction. Another neutron leaves the system without being absorbed. However, one neutron does collide with an atom of uranium-235, which then fissions and releases two neutrons and more binding energy. 3. Both of those neutrons collide with uranium-235 atoms, each of which fissions and releases a few neutrons, which can then continue the reaction.
If two pieces of subcritical material are not brought together fast enough, nuclear predetonation can occur, whereby a smaller explosion than expected will blow the bulk of the material apart. See Fizzle (nuclear test)

A nuclear chain reaction occurs when one single nuclear reaction causes an average of one or more subsequent nuclear reactions, thus leading to the possibility of a self-propagating series of these reactions. The specific nuclear reaction may be the fission of heavy isotopes (e.g. U). The nuclear chain reaction releases several million times more energy per reaction than any chemical reaction.
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