Measurement of the $^{7}Be + ^{9}Be$ cross section at beam momenta of 13A, 20A and 30A GeV/c

The NA61/SHINE experiment located at the SPS at CERN covers many purposes in various elds. It is a xed target experiment, which operates with di erent targets and beams. In 2012 and 2013 data was taken at di erent beam momenta with a 7 Be beam and a 9 Be target. Within this Bachelor work the data of NA61/SHINE was analyzed and the rst results on the 7 Be + 9 Be cross section at beam momenta of 13 A , 20 A and 30 A GeV/c are presented. In chapter 1 a de nition of the cross section is given and its approximation for the case of nucleus-nucleus collisions using the geometrical model is de ned and calcu- lated. The NA61/SHINE experiment and its detectors are described in chapter 2. The procedure which is used for the evaluation of the cross section and the interac- tion probability is presented and explained in chapter 3. It also includes information about the analyzed runs and the used event cuts. Further the interaction probability is calculated for all data sets with the standard cuts. The in uence of the variation of di erent cuts on the interaction probability is studied in chapter 4. Also in this analysis the systematic error is estimated and presented. In chapter 5 the values of the cross section are shown for all analyzed data and compared with the results at 1.45 A GeV/c.