Abstract
Until recently, all calculations of breakup observables were carried out in a non-relativistic regime. The relativistic treatment of the breakup reaction in 3 N system is quite a new achievement. The detailed study of various aspects of few-nucleon system dynamics in medium energy region, with a particular emphasis on investigation of relativistic effects and their interplay with three nucleon force (3NF) becomes feasible with increasing available energy in the three nucleon system. Therefore an experiment to investigate the ^1H(d, pp)n breakup cross section using a deuteron beam of 300, 340, 380 and 400 MeV and the WASA detector has been performed at COSY-Jülich. The almost 4pi geometry of the WASA detector gives an unique possibility to study variety of kinematic configurations, which reveal different sensitivity to aspects of dynamics of the three nucleon system. The main steps of the analysis, including energy calibration, PID, normalization and efficiency studies, and their impact on the final accuracy of the result, are discussed.
Highlights
Three-nucleon system dynamics can be investigated quantitatively by comparing observables calculated with the use of Faddeev equations with precise measurements
The dynamics is generated by the chiral effective field theory (χ EFT), so far at the next-to-next-to-leading order with all relevant NN and 3 N contributions taken into account [4]
The analysis is continued with the aim to determine the differential cross sections for the the deuteron breakup process for a large set of kinematical configurations covering a significant part of the reaction phase space
Summary
Three-nucleon system dynamics can be investigated quantitatively by comparing observables calculated with the use of Faddeev equations with precise measurements. Page 2 of 4 calculations include the long-range Coulomb interaction or relativistic effects. In the recent years the relativistic treatment of the breakup reaction in 3 N system was developed using NN potential in [6] and this approach has been extended for calculations including 3NF in [7]. We measured the differential cross section of the 1 H (d, pp)n breakup reaction at energies of 300, 340, 380 and 400 MeV. The investigations at this energy range will enable to study the evolution of the relativistic and 3NF effects, and will put strong constraints on the theoretical calculations
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