Orsay: energy considerations for S2s

Need to consider whether the particles we want to see will punch through the S2 detectors. Here's the energies of the "good" events with the S2 configuration from below:



Stopping the alphas might be a problem. Here's what SRIM says:...actually the table formatting is too hard to read. Never mind. What it says is that 25 MeV alphas stop in 317 um of Si, and 35 MeV alphas stop in 564 um. Even the Edinburgh 500-micron S2s won't be enough to stop the forward alphas.

(Stopping the Oxygen is not a problem--just a few microns does it.)