A Isovector and Isoscalar magnetic moments

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Hi all,
I am currently working on the Skyrme model. In the paper of Zahed and Brown: "The Skyrme Model" which can be found online they want to calculate the magnetic momenta of protons and neutrons. They do this by first calculating the isoscalar and isovector magnetic moments(p.69). However, I first of all do not understand how these are connected to the baryon/isovector current and how one should deduce the magnetic momenta of proton/neutron from these.
Do you have any good book/textbook suggestion(which would ideally be found online;)?
Thanks so much in advance!
Bob
 
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Thank you a lot- unfortunately a lot of the pages are not visible.
 

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