Hey guys, posted this in HW help, but its actually just a thought i had in chem class. I was wondering if light or heavy elements would be better at stopping slow moving neutrons? And how come? By heavy and light, i mean mass. Heres what i think. I thought a heavy element would have a better chance of stopping particles because they have a high probability of smacking the heavy elements' nucleus, but does this apply to neutrons flying through other heavy elements? Kinda like Rutherford's experiment eh? Thanks guys.