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  1. Why we use the minimum diffraction angle here to find the nuclear radius? I know how to find the radius (using the equation $d\sin(\theta)=1.22(\lambda)$), but I don't know why we use the first minimum angle.

  2. How do you interpret such graph qualitatively? Why the bigger the diffraction angle, the lower the intensity/cross section?

  3. How about the graph with multiple minima (As shown below)? How do you interpret the consecutive minima? It can't be a nucleus with multiple radii, right?

enter image description here

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