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markrosauer
2009-Aug-13, 01:25 PM
Ok, Something that I have never really understood even in my advanced Physics classes:

An antineutron is composed of antiquarks and has the opposite magnetic moment of a neutron (which is composed of quarks). However, both of these particles are, by definition, electrically neutral. So how can neutral particles annihilate each other?

Also, are protons attracted to neutrons because neutrons are, in comparison, more negatively charged than protons? Would the same hold true or not true for electrons being attracted to neutrons and all the associated antiparticles being attracted to antineutrons/neutrons?

BTW, thanks for the birthday greeting. At least someone remembered.

HenrikOlsen
2009-Aug-13, 08:45 PM
If you look at a neutron as consisting of a proton, an electron and an electron anti-neutrino it becomes easier to see how it's annihilated by an anti-neutron, as that consists of a positron, an anti-proton and an electron neutrino, each of with annihilates their counterpart. (note, simplified explanation)