A question about quantum tunnelling

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SUMMARY

Quantum tunneling occurs when particles pass through potential barriers, which can include physical barriers as well as energy barriers. In fusion, protons overcome the repulsion of a nucleus by entering a high potential area, allowing them to collide and complete the fusion process. However, when discussing an atom passing through a physical barrier, it must navigate through the atoms that constitute the barrier itself. This distinction highlights the complexity of quantum tunneling in different contexts.

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ShayanJ
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I understand quantum tunnelling while thought as the one happening in fusion.But could someone explain the process when we're talking about a particle passing through a physical barrier not just a potential barrier?
thanks
 
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ALL barriers are potential barriers. The repulsion of a proton against a nucleus for fusion is just like the repulsion of an atom against other atoms as it tries to get through whatever barrier.
 
Yes I understand that but there is difference between these two situations.
In fusion a proton goes into the high potential area of the electric field and continues motion till it collides with the other proton and its finished.
But in second situation the atom not only must go into the high potential area but also must pass the atoms themselves.How can matter pass through matter?
that's what I mean.(nice signature drak)
thanks
 

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