1. Introduction to the pb Experiment

6.3.2 NORMALIZATION

In the analysis events with exactly one neutron counter information n (n=1,30) and exactly one tag counter information t (t=1,12) are accepted in order to avoid ambiguities. For all the neutron and the tag counters the unit vectors from the origin (center of the LH₂ target) to the center of the counters are known. The angle q _1n can be calculated using , and E_{g 2}(n,t) is obtained for each combination of neutron counter n and tag counter t. As displayed in Fig. 6.2, the values for E_{g 2} are between 68 and 75 MeV. The energy E_s deposited in the CsI-array is calculated from the experimental data. The normalized energy E_n for each event is

MeV. ( 6.10)

Before normalizing the energy E_s deposited in the CsI-array to 70 MeV, several corrections have to be applied to the experimental data, which are described below. The experimental data of one run are analyzed in two iterations: In the first iteration, pedestal and gain values are calculated and in the second iteration the corrected data were used to calculate the deposited energy E_s for each event.