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## Main Question or Discussion Point

I remember reading about charge independence; about how the energy levels of mirror nuclei (correcting for differences in the colomb term) are identical… I think this suggests that the force between any two nucleons is the same, so the attraction of neutron-proton=proton-proton=neutron-neutron.

One of my textbooks states the following:

"The average neutron-proton attraction in a nucleus is greater than the average neutron-neutron or proton-proton attraction, essentially as a consequence of Pauli Exclusion Principle."

questions:

1)is the textbook right about the force between n-p not being equal to p-p or n-n?

2)Can someone explain how Pauli EP is relavent here?

I've tried reasoning it in my head, but I'm getting confused: I probably don't know what I'm talking about but n-p has an antisymetric isospin (right?), therefore the space wavefunction has to be symetric? Is this relavent?

Thanks in advance:)

One of my textbooks states the following:

"The average neutron-proton attraction in a nucleus is greater than the average neutron-neutron or proton-proton attraction, essentially as a consequence of Pauli Exclusion Principle."

questions:

1)is the textbook right about the force between n-p not being equal to p-p or n-n?

2)Can someone explain how Pauli EP is relavent here?

I've tried reasoning it in my head, but I'm getting confused: I probably don't know what I'm talking about but n-p has an antisymetric isospin (right?), therefore the space wavefunction has to be symetric? Is this relavent?

Thanks in advance:)