Orsay: relative energy distribution for alpha coincidences

Alex's suggestion: calculate relative energy for (simulated) two-alpha events, see if there's a spectrum.
Results: see figure: there's a clear peak, with a fwhm of about 250 keV.



To duplicate this in the data, need some kind of position-to-theta mapping. If the position is linear in theta, then the mapping should be as follows:
detectors 2 and 3: θ = 96 - 14 p or 96 - 14(1-p)
detectors 4 and 5: θ = 63 - 14 p or 63 - 14(1-p)
where p goes from -1 to 1, and the two options account for the two possible orientations of the strips (low p = low theta or the opposite).