Transcript Document 7897982

Progress on the Compton
Analysis
R. S. Holmes, A. Rakhman
Compton X-Sect and Asymmetry
The DL response function
Di-Gaussian. Parameters are
extrapolated with polynomials
Extrapolated
Other fits:
1. 2D polynomial
2. Variable width Gaussian
Observed Compton Spectrum
Integrate response
Function folded
With theory
New Systematic
Appeared when a bug was fixed
Effect is down (at low end) by 2 with new function
Accidental Background on the Tail
Add 10 runs (with same gain)
Linear
Log
Hint of accidentals
Accidentals Easy to See on Low
Energy Strip
Monte Carlo
Monte Carlo
Data
Pulse shape?
Monte Carlo of Accidental
Pseudo-Effect of Accidentals
Data
Monte Carlo
Sensitivity to Thresholds
This must
be understood.
We have ideas.
New Fit Parameters vs PMT Gain
Gaussian with
Variable width
Cuts
Parameters versus
Polarization of run
Polarization vs Run
Χ2 is getting
better. It looks
like we are
ultimately
statistics
limited
Jobs
• Make sure that <ADC>~E and that width
behaves reasonable with E.
• Rewrite code so that it can analyze Monte
Carlo
• Model slow PbWO4 response.
• Fix various bugs.