Abstract
An experiment to investigate the \(^{1}\)H(d, pp)n breakup reaction using a deuteron beam of 300, 340, 380 and 400 MeV and the WASA detector has been performed at the Cooler Synchrotron COSY-Julich. As a first step the data collected at the beam energy of 340 MeV are analysed, with a focus on the proton-proton coincidences registered in the Forward Detector. The differential cross section is determined for 189 configurations on a dense angular grid defined by the emission angles of the two outgoing protons: two polar angles \(\theta _1\) and \(\theta _2\) (in the range between 5\(^{\circ }\) and 15\(^{\circ }\) with the step size of 2\(^\circ \)) and the relative azimuthal angle \(\varphi _{12}\) (in the range from 20\(^\circ \) to 180\(^\circ \), with the step size of 20\(^\circ \)).The cross section data are compared to theoretical predictions based on the state-of-the-art nucleon-nucleon potentials, combined with three-nucleon force, Coulomb interaction or carried out in a relativistic regime.
Highlights
Few nucleon systems are ideal laboratories to study details of nuclear interactions
With the lack of complete calculations performed in relativistic regime, including 3N F and Coulomb interaction, there is a need of the systematic data set collected in a large phase space
A new measurement of the 1H(d, pp)n breakup cross section using a deuteron beam of 300, 340, 380 and 400 MeV with the aim to check the theoretical predictions for relativistic effects and to unambiguously fix a relevance of the 3N F
Summary
Few nucleon systems are ideal laboratories to study details of nuclear interactions. Their theoretical and experimental investigation started from the simple nucleon–nucleon (2N ) systems and gradually evolved into more complex environments. With the lack of complete calculations performed in relativistic regime, including 3N F and Coulomb interaction, there is a need of the systematic (in the beam energy) data set collected in a large phase space. This may allow us to trace the effects in the kinematic regions where they play locally very important role. A new measurement of the 1H(d, pp)n breakup cross section using a deuteron beam of 300, 340, 380 and 400 MeV with the aim to check the theoretical predictions for relativistic effects and to unambiguously fix a relevance of the 3N F
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