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Nuance / Neut comparison

Nuance / Neut comparison. Comparisons on a generator and simulation level (all information is read from .root files produced by Geant) Neut file: 20.000 evts from h2o.neut4.5.1.flux04b_40GeV_2.5deg.nd5.001.nfsi.nt Guessing from the name (h2o*), these events are generated on water!.

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Nuance / Neut comparison

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  1. Nuance / Neut comparison • Comparisons on a generator and simulation level (all information is read from .root files produced by Geant) • Neut file: 20.000 evts from h2o.neut4.5.1.flux04b_40GeV_2.5deg.nd5.001.nfsi.nt • Guessing from the name (h2o*), these events are generated on water!

  2. Generator/Simulation: Number of muons (all and primary) • Less muons in neut (<Nneut>=0.71, <Nnuance>=0.75) nuance neut

  3. Generator/Simulation: Number of protons (all and primary) • Less protons in neut (<Nneut>=1.1, <Nnuance>=1.5 for primary protons) – a significant difference nuance neut

  4. Generator: Momentum distributions of primary muons and protons • Muons much softer in neut nuance neut

  5. Simulation: Number of muon hits in SMRD per event • Vertices in the whole detector (including the magnet) • Slightly less hits for neut nuance neut

  6. Notes for neut files • Sometimes (25evts in 20000) the trajectory container is missing (??)

  7. Some questions • The detector is situated off-axis. This means that the flux may change from top to bottom. As far as I understand this is not taken into account in the simulation (the distribution of vertices depends on the material density only). Am I right? • The detector is 2.5deg off-axis, but it’s large enough to catch neutrinos from (very approx.) 1.75deg to 3.25deg (this is including the magnet; 2.20 to 2.80 for the basket). This may influence the energy spectrum. I’m not sure whether this was taken into account in Neut files that we’re now using.

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