原子质量与质量数有什么区别?如何找到中子质子的原子质量?


回答 1:

Atomicmassistheactualmassofanatom.ItisroughlythemassnumbertimesoneAMU(1.6605389×1027kg).NeutronsandprotonsbothmassaboutoneAMU.(Tobemoreprecise,abareprotonmasses1.0072765AMUandabareneutronmasses1.0086652AMU.)Whenyouputthemtogetherwithotherprotonsandneutronsinanucleus,atinybitoftheirmassdisappearsdownthepotentialwellofthestronginteraction.Atomic mass is the actual mass of an atom. It is roughly the mass number times one AMU (1.6605389\times 10^{-27} kg). Neutrons and protons both mass about one AMU. (To be more precise, a bare proton masses 1.0072765 AMU and a bare neutron masses 1.0086652 AMU.) When you put them together with other protons and neutrons in a nucleus, a tiny bit of their mass “disappears down the potential well” of the strong interaction.


回答 2:

将所有原子质量都视为中性原子质量很方便。原子核的质量数是它包含的核仁的整数。因此,质子和中子的质量数均为1。

但是中子和质子的实际质量(精确地由C12 = 12.000000000定义的原子质量单位)分别是1.0086649和1.0078250。由于中子的重量增加,β会衰减成质子和电子。