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不同于电子和质子质量的测量(可以通过荷质比的测定求出),中性的中子质量的测定要困难得多。这可能也是约里奥·居里夫妇当年错失发现电子机会的原因之一。中子质量通常采用碰撞的方法转化为测定带电粒子的速度而求出。
Unlike the measurement of the mass of electrons and protons (which can be determined by the charge-to-mass ratio measurement), the measurement of neutral neutron mass is much more difficult. This may be one of the reasons why Joliot Curie missed the opportunity to discover the electronics. The neutron mass is usually determined by collision into a method for measuring the velocity of a charged particle.