# Can the spin of a subatomic particle increase?

Can the spin of a particle increase? Can it get stronger? Can we measure this?

For composite particles, like the proton (which is made of two up quarks and one down) one can change the way the quarks' spin combines to make a total spin of 3/2 while keeping the particle content. However, this introduces so much energy into the quarks' interactions that it dramatically increases the composite's mass, and we simply think of it as a different particle; thus, the spin-3/2 version of the proton is known as the Delta $\Delta^+$ baryon.