Histograms of gammas at sensitive detectors

We describe here the GmHistosGammaAtSD, an utility that prints information about the interaction of 'original' gammas in the sensitive detector. It is a user action and therefore it can be activated with the command

/gamos/userAction GmHistosGammaAtSD

At the end of run a table like the following one is printed:

 $$$$$$$$$$ Classification of Gamma Interactions in SD $$$$$$$$
	$$GC: nEvents       : 1000000
	$$GC: n gamma in SD : 516170 : 25.8085 %
	$$GC:  n PE           : 321588 : 62.30273 %
	$$GC:    PE 0 COMP      : 157614 : 49.011157 %
	$$GC:    PE 1 COMP      : 111304 : 34.610744 %
	$$GC:    PE >1 COMP     : 52670 : 16.378099 %
	$$GC:  n COMP         : 222590 : 43.12339 %
	$$GC:    1 COMP         : 159193 : 71.518487 %
	$$GC:    >1 COMP        : 63397 : 28.481513 %
	$$GC: nGamma_COMP/event: 0.585931

• nEvents : total number of events.

• n gamma in SD : number of 'original' gammas reaching one sensitive detector.

• n PE : number of 'original' gammas with photoelectric interaction in SD

• PE 0 COMP : number of 'original' gammas with photoelectric interaction and no Compton interactions in SD (percentage relates to ``n PE'').

• PE 1 COMP : number of 'original' gammas with photoelectric interaction and one Compton interaction in SD (percentage relates to ``n PE'').

• PE >1 COMP : number of 'original' gammas with photoelectric interaction and more than one Compton interaction in SD (percentage relates to ``n PE'').

• n COMP : number of 'original' gammas with Compton interactions in SD.

• 1 COMP : number of 'original' gammas with only one Compton interaction in SD (percentage relates to ``n COMP'').

• >1 COMP : number of 'original' gammas with more than one Compton interactions in SD (percentage relates to ``n COMP'').

• nCOMP/event : number of Compton interactions in SD per 'original' gamma.

This class also makes several histograms, all of them have the words Gamma At SD: included in their names. And all are written to the file gammaSD.root/csv. The following histograms are defined:

• Event Type / 100, i.e. no Rayleigh counting ("Event Type")

• Number of photoelectric interactions per 'original' gamma ("N PhotoElec")

• Number of Compton interactions per 'original' gamma ("N Compton")

• Number of Rayleigh interactions per 'original' gamma ("N Rayleigh")

• Number of photoelectric interactions vs Number of Compton+Rayleigh interactions per 'original' gamma ("N PhotoElec vs Compton+Rayleigh")

• Energy of gamma upon entering SD("Energy at entering SD (keV)")

• Energy lost in the photoelectric interactions ("Energy lost PhotoElec (keV)");

• Difference in position from the gamma entering SD to the point where a photoelectric interaction happened ("Diff pos when PhotoElec (mm)")

• Difference in direction from the gamma entering SD to the point where a photoelectric interaction happened ("Diff dir when PhotoElec (mm)")

• Difference in kinetic energy from the gamma entering SD to the point where a photoelectric interaction happened ("Diff energy when PhotoElec (mm)")

• Energy lost in the Compton interactions ("Energy lost Compton (keV)");

• Angle variation in the Compton interactions ("Angle variation Compton (mrad)")

• Energy lost in the Rayleigh interactions (must be 0.)("Energy lost Rayleigh (eV)")

• Angle variation in the Rayleigh interactions ("Angle variation Rayleigh (mrad)")

All these histograms are repeated for the different types of events (a prefix in the name marks the event type the histogram refers to):

• "ALL: ": every event

• "No PE: " events where no photoelectric interaction occurred

• "Only PE: " events where only photoelectric interaction occurred

• "PE + 1 Compt: " events where one photoelectric interaction plus only one Compton interaction occurred

• "PE + >1 Compt: " events where one photoelectric interaction plus more than one Compton interaction occurred