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Forum: Processes Involving Optical Photons
Re: Sad help@Setted decay time constant can not accord with simulation result (ja)
Date: 15 Jul, 2011
From: Gumplinger Peter <Gumplinger Peter>

Sorry, this message slipped under my radar after I first saw it.

On Wed, 06 Jul 2011 07:20:35 GMT, ja wrote: > In my work,the fast&&slow decay time constants are both setted 2.7ns

If your crystal only has one time component, define only one; e.g. don't artificially split it up equally between the possible two!

> The
> SetParticleTime is 0*ns when the gamma rays generated,the GetGlobalTime
> got when photon hit the SD.
> 
> So,the result of decay time constant,regardless of the fitting method
> employed,is about 3.3ns.I'm so confused about this time broadening.

This broadening comes about - I would think - because your detected photons have traveled some distance/time and they are not all travelling the exact same time to your detector. This extra time smearing introduced by the detection geometry broadens the originally sampled decay time constant.

> 
> Any helpful response is appreciated.
> 
I sure hope you have since come to the sampe conclusion.

Peter

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