Etude et impact du bruit de fond corrélé pour la mesure de l'angle ...

3.9 Conclusions 77
tel-00821629, version 1 - 11 May 2013
Figure 3.27: Data and MC 2.2 MeV n-H capture peak as obtained from 252 Cf
calibration source deployed in the center of the detector. The peak position
is defined as the energy conversion factor, corresponding to 230 PE/MeV.
the responses are equalised at 2.2 MeV. Such discrepancies were explored
by using all calibration sources in the energy range [0.7, 8] MeV deployed
along the z-axis and guide tube. A 0.85 % variation consistent with this
non-linearity was measured with the z-axis calibration system, and used as
the systematic error for relative non-linearity. Consistent results were obtained
when sampling with the same sources along the GT.
The systematic uncertainties related to the energy scale are summarised in
Tab. 3.3. Upon calibration, the remaining di↵erence in response between
data and MC is of 0.3 % [42].
Error [%]
Relative non-uniformity 0.43
Relative instability 0.61
Relative non-linearity 0.85
Total 1.13
Table 3.3: Contribution to the systematic uncertainty related to the energy
scale.
3.9 Conclusions
The DC detector design, the electronics and the online system has been described
with details highlighting the major improvements with respect the
previous CHOOZ experiment. The FD was build between 2009 and 2010