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A proton is a positively charged particle which is generally considered to be a composite particle comprising of three quarks interacting through the strong force (e.g. in the standard model.)
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Neutron to proton transition matrix element
Well I have managed to understand this.
Basically one must act with $\tau$ in every quark of the neutron wave function (https://wikimedia.org/api/rest_v1/media/math/render/svg/d01d80212401fe5d60053ac …
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Neutron to proton transition matrix element
I am reading the book Advances on Nuclear Physics vol 13 by J. w. Negele and Erich Vogt.
On page 33, one is going to calculate a matrix element corresponding to a transition of a neutron to a proton.
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