He went on to tell us about symmetry energy, do you remember that important term in the Bethe-Weizsacher mass formula? ... well, you should cause it tells us important things such as which the best proton value for a given A is, and also because it is responsible for the neutron drip line. The symmetry energy is, interestingly, a direct manifestation of the Pauli Exclusion Principle.
Jorge told us about the P-REX experiment that aims to measure the neutron skin in 208Pb, in order to determine the density dependence of the symmetry energy. Here's some more info: http://hallaweb.jlab.org/parity/prex/
I still have a couple questions that I didn't get (dare?) to ask during the discussion session: why did they chose 208Pb for this experiment? ... are there any other nuclei that could be used instead?
I think the simple answer is that 208Pb is the largest doubly magic nucleus - so it's relatively simple to model theoretically while still having a large neutron excess and thus a relatively large neutron skin.
ReplyDeletePerhaps.
This cost iѕ the сost effectiveneѕs.
ReplyDeleteΒeing аn ACN Mom myѕеlf іn Spenceг Hunn's downline I can say anything I want business on here. Think of Google Docs, and archived for retrieval at a later point in time development will have to pass on my two cents worth of ideas and new concepts.
Here is my homepage; online marketing company