3He(e,e'd) Background Subtraction / Dilution factor estimation

Wishes:

1.) Make PID (using dE,E vs. p plots)
2.) Subtract random coincidences using raw coincidence time plots
3.) Estimate dilution factor/ proton contamination (using DL.t3 vs. p plots ??? - Should not subtract background twice!!!)

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Deuteron PID cut:

04.)

Deuteron PID cut takes only those events, that lie above lower red line and under upper red line. Therefore extension of the lower red line to the left has no effect. Deuteron cut needs to go very close to proton cut, because there are some good deuterons in that region and we are eager to collect all deuterons.

Improvements in the the Background subtraction:

Before:

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After:

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New Results:

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Proton contamination:

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Deuteron Elastics:

Probably can not be used for contamination estimation.

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Nitrogen data:

Will use to check any false asymmetries:

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Problem with ADC??? noise:

I suspect that additional lines seen in the ADC spectra are caused by the low-energy particles, that come into the ADC within the gate and get integrated, causing a bigger ADC readout. These particles have too small energy to form trigger, because they are always below threshold. Although this sounds convining, I can not (yet) prove this statement. Working on that!

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Last modified: 08/03/11