^这种分离是基于产生的原子核会比未反应的粒子束更慢地通过目标。分离器中包含电场和磁场,若粒子速度恰好,則電場與磁場对运动粒子的影响会剛好抵消。[19]飞行时间质谱法(英语:Time-of-flight mass spectrometry)和反冲能量的测量也有助分离,两者结合可以估计原子核的质量。[20]
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