Hello, I'm following an introductory course in modern physics.
So I understand there's a chance the particle appears on the right side of the barrier, and this has been experimentally verified.
Now I was wondering: can the particle also appear in the barrier?
If so: is this directly measurable? If not, is this indirectly measurable? (for the latter, I'm thinking of the virtual bosons interacting for the fundamental forces: we can't directly measure them, but their effects are measurable)
If not: then what does it mean that the probability function is non-zero in the barrier? Shouldn't the blue part be made zero then?