Consider the scattering of two particles of equal mass (for example, scattering of protons off
when the projectile and target have equal masses
(b) Write down the lab cross section for the scattering of two equal-mass hard spheres. (We know that in the CM frame, the differential cross section is R 2 /4 where R = R1+ R2 .) By integrating over all directions, verify that the total cross section in the lab frame is πR2, as it has to be.
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