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## Main Question or Discussion Point

Hi guys!

I'm trying to understand how to use the fact that the total isospin is conserved in all strong processes in the particular case (

$$ p+p \rightarrow d+\pi^+ $$

Griffiths first argues that the deuteron d has isospin I=0, because of experimental reasons, basically. He uses this to conclude that "the isospin states on the right are |11>, |10>,

and |11>, respectively, whereas those on the left are I1 1>, $$\frac{1}{\sqrt{2}}(|10>+|00>)$$

and |1 - 1>"

I do not understand how he concludes this. Could you please enlighten me?

I'm trying to understand how to use the fact that the total isospin is conserved in all strong processes in the particular case (

*vide*Griffiths, pages 118 and 119):$$ p+p \rightarrow d+\pi^+ $$

Griffiths first argues that the deuteron d has isospin I=0, because of experimental reasons, basically. He uses this to conclude that "the isospin states on the right are |11>, |10>,

and |11>, respectively, whereas those on the left are I1 1>, $$\frac{1}{\sqrt{2}}(|10>+|00>)$$

and |1 - 1>"

I do not understand how he concludes this. Could you please enlighten me?