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Re: prespec git updates [message #17645 is a reply to message #17158]

Fri, 12 December 2014 13:39

miree
Messages: 71
Registered: June 2014

continuous participant

From: *ikp.physik.tu-darmstadt.de

Hello,

A severe problem in the so called "Core Tracking" algorithm was discovered by Liliana
(the name of the processor is "GammaTrackingCore" in the AGATA plugin) .
First, the algorithm was throwing out all events with only one PSA hit the full array. That reduces the statistics.
Second, it produced one additional "nonsense gamma". The second point increases the gamma multiplicity by one, but does not affect the gamma spectra.

I have rewritten the algorithm and copied the old one to "GammaTrackingCoreWithBug", in case you want to quantify the losses you had in your spectra. The changes are already pushed to the git repository.

I did the comparison for one of the 80Kr Coulex runs (everything else in the analysis is identical).
The counts in the 80Kr peak (at 616 keV):
old: 569.95 +- 45.1105
new: 688.684 +- 48.2208
index.php?t=getfile&id=8213&private=0

(the histograms are background subtracted. That is why some of the bins may contain fewer counts after correcting the mistake.)

So 20% of the counts were lost because of that mistake.
I don't know if under different conditions (higher/lower rate, heavier particles, etc.) the loss is bigger or smaller.

I'm sorry for that mistake!
Michael

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[Message index]

		prespec git updates By: miree on Mon, 11 August 2014 19:51
		Re: prespec git updates By: mlcortes on Thu, 14 August 2014 13:43
		Re: prespec git updates By: mlcortes on Mon, 18 August 2014 11:21
		Re: prespec git updates By: miree on Tue, 19 August 2014 17:18
		Re: prespec git updates By: miree on Fri, 14 November 2014 14:53
		Re: prespec git updates By: miree on Thu, 27 November 2014 21:26
		Re: prespec git updates By: miree on Fri, 12 December 2014 13:39
		Re: prespec git updates By: miree on Wed, 21 January 2015 11:49
		Re: prespec git updates By: mlcortes on Thu, 22 January 2015 14:42
		Re: prespec git updates By: Michael Reese on Mon, 01 August 2016 13:35

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