Some things to improve

[konarfil]

Some quick scribbles - future challenges (in Czech) poznamky.odt

[miroslav-macko]

Things to improve (Miro´s extra list):

• [ ] Study why we need additive constant (+ c) in fit of 482 keV peak.
  • [ ] Is this constant caused by events from 976 keV peak which are in tail of Landau distribution? How do such event look like?
  • [ ] In brief first simulation we have seen something like gamma peak. Is this maybe caused by some gammas?
• [ ] Which individual OM resolutions we need to plug into Falaise so with all the detector effects we can mimic the real data spectra?
• [ ] Can we exploit data from reference OMs? For example use some alpha source? Maybe study the optical effects?
• [ ] IMPORTANT: Can we finally accept / reject a hypothesis that the worsening of the OM resolutions is caused by aging of the OMs?
  • [ ] We need to study the resolutions - how they develop over the time (1 year or so)
  • [ ] We need to search for articles which discuss the againg effect of polystyrene - maybe there is known curve (resolution vs. time). Then we need to compare our findings with these curves.
• [ ] Try to work with "special cuts", for example only take 10 cm x 10 cm (or 5 cm x 5 cm) in center of each OM. In this region the correction factor of optical corrections is around ~1 (no correction) so we could study the energy loss corrections with data directly.
  • [ ] Similar thing could be achieved by taking into account only electrons which travelled similar distance (e.g. 550-600 mm)
  • [ ] Think about some other possible justifications of the corrections with real data.
• [ ] Implement better charge integration using Gill´s and Khrystyna´s findings.
• [ ] There is a possibility that we could profit from 3rd peak for calibration (around 1600 keV). It is weaker but maybe we could find a method how to fit it (maybe maximum likelihood method)?
  • [ ] Near third peak there should be some structure caused by gammas. If I remember right it should be Compton edge of the gammas from Bi-207 (discuss with Manu, he discussed this with us). Maybe we need to describe this properly before we try to work with the 3rd peak?
• [ ] The composition of the gas will be precisely measured. The composition enters into the energy loss correction (Bethe-Bloch). Would it make a difference if we implement these small gas composition changes?
• [ ] To discuss with Francois: We need to add estimation of sigma_a, sigma_b and sigma_ab of the calibration parameters of a and b (and maybe also fit quality flag - good, bad, questionable) into output. Discuss it with Francois
  • [ ] We need also to propagate sigma_a, sigma_b and sigma_ab into sigma_E - final uncertainty of the energy.
• [ ] Finally resolve the question of the Bi-207 positions. There are very nice works by Vladyslav Yankovskyi, Ivan Kovalenko and Sam Pratt which need to be merged together. This task has an article potential.
• [ ] Suggestion by Francois: Rename "calibration tools" to more precise name, something like "calocalibration tools". There will be more types of calibrations and it could be confusing.