科学家们知道：只有在中子撞击原子的原子核时，中子才可能处于游离状态。这种碰撞会改变原子核的运动轨迹。
Scientists know that a neutron is loose only when the neutron hits the nucleus of an atom. The collision changes the path of the nucleus.
这架望远镜被命名为“冰立方”，其工作原理是：当一个微中子撞击冰中的水分子原子时，望远镜就会探测这些罕见的场合中产生的闪光。
Called IceCube, it will work by detecting the flashes of light generated on those rare occasions when a neutrino hits one of the atoms in a molecule of water in the ice.
同时还需要足够多的、可裂变的原子核用于中子进行撞击，换句话说，需要一个临界质量。
There also need to be enough fissionable atoms about for the neutrons to bumpinto—in other words, a critical mass.
足够多的中子就会引发进一步的裂变—不是逃走，要么撞击原子，要么被没有裂开的原子吸收—演变成自动维持的过程。
When enough of these neutronsproduce further fissions—rather than escaping, bouncing off or being absorbedby atoms that do not split apart—the process becomes self-sustaining.
撞击会生成两种拥有117个质子的同位素，其中一种元素有176个中子，而另一种元素有177个中子。
The collision spit out neutrons to create two isotopes of an element with 117 protons, one with 176 neutrons and the other with 177.
但有时宇宙射线会撞击氮原子，赋予它一个额外的中子。
But sometimes a cosmic ray will collide with a nitrogen atom, giving it an extra neutron.
一个撞击铀235原子的中子，释放出一些γ，和一些中子，创造出2个裂变碎片,那它们自己会有出现的分布。
A neutron striking a uranium 235 atom, releasing some gammas and some neutrons, creating two fission fragments which themselves have a distribution of occurrence.
氮16是来自堆芯的高速中子在周围的冷却水中撞击氧原子的时候产生的。
It is made when speeding neutrons from the reactor's core hit oxygen in the surrounding cooling water.
中子在撞击到发生器内部的靶材上的离子的碰撞中产生。
Neutrons are generated from a collision of ions impinging on a target in the generator.
中子在撞击到发生器内部的靶材上的离子的碰撞中产生。
Neutrons are generated from a collision of ions impinging on a target in the generator.
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