Energy spectra plots

• Crude: done at the same time as the PMT information is filled and uses knowledge of the exact positron and neutron gamma positions to simulate PMT response. Assumes knowledge of positron and neutron-like energies. Includes all effects in the NuSAG simulation document.
• Charge-weighted: done the same way as crude but with a charge-weighted sum over all PMT to find reconstructed positions for the positron and neutron gammas. Contains a bug in the charge-weighted sum where the weighting is only correct for Q > 0 (not correct now that we allow the pedestal to drive Q negative). Also seems to have a pathology (maybe bug) associated with adding the Cerenkov light in both positron and neutron distributions. Assumes knowledge of positron and neutron-like energies.
• Scope-trace: sums the energy in a time window started by energy above some threshold (for these plots it is E > 0.2 MeV). No prior knowledge of the light-generating particle is assumed.

Spectra Plots:

Figure 1: (a) reconstructed positron energy for crude (solid) and scope-trace (dashed) recons. (b) reconstructed neutron energy for for crude (solid) and scope-trace (dashed) recons. Only energy cuts are made for all curves (no timing or position cuts). The dashed curves have a 0.2 MeV threshold to detect a neutron or positron.

Figure 2: plots for NuSAG using the scope-trace reconstruction.

Followup plots:

Figures of PMT "scope-trace" reconstructed energy distributions with a 0.2 MeV threshold:

Supplemental plots:

Figure 3: plots of reconstructed positron energy with all effects (solid), no light from neutron elastic scatter (ES) (dashed), and no Cerenkov light (dotted) for 10k events with neutron energy cut. Pathology in low Q-weighted recon at 1 MeV is gone when Cerenkov light effects removed.

Figure 4: R position for events with neutron capture (En > 6 MeV) in the low energy positron tail (Ee+ < 1 MeV).