Relativistic treatment of the few-nucleon theoretical models has beenrecently developed for the deuteron breakup reaction. This ingredient canbe quantitatively verified with the use of the deuteron breakup reactionat the intermediate energy region. The interplay of relativistic and threenucleonforce (3NF) effects can also be studied. For this purpose, an experimentinvestigating the 1H(d; pp)n breakup cross section was performedin FZ-Jülich. The unpolarized deuteron beam of energies of 170, 190 and200 MeV per nucleon was impinging on the hydrogen pellet target and thereaction products were registered with the use of the Wide Angle ShowerApparatus (WASA) detection system. Its almost 4 geometrical acceptancegives unique possibility to study a variety of kinematic configurations. Themain steps of the analysis, including PID, efficiency studies and normalization,and the preliminary results of the cross section are discussed.
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