How is center of mass in a complex systems?

jojo1st
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Now i am suddenly confused with the concept of the center of mass.
As we know , nucleus are a system of many-body,composed of nucleons. And their interactions are very complex between nucleons. I want to know, If we can observe a nuclei such as Ne20, how is the motivation of its center of mass?
 
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What do you mean by motivation?
 
Sorry , I mean motion.
 
The position of the center of mass is not affected by the internal motion of the nucleons.
 

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