[continues from 4.6.1]

4.6.2 Scintillation region

The top fraction of the scintillation region contributes also to the total efficiency; events that interact in this top region produce a BL within the nominal thresholds. This effect can be modelled by a "fudged" layer of Xenon, whose depth is stored in files m{1,2,3}_scintillation.coeff

The values are:

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Fig. 4.6.2-I : absorption efficiency in the scintillation region

The overall efficiency of the gas cell is the sum of the absorption efficiency in the drift region and of the product of the absorption efficiency in the scintillation region (see figure above) times the transmission efficiency of the drift region (complement to 1 of the relevant absorption).

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Fig. 4.6.2-II : overall efficiency of the MECS gas cells


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