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26 April 2024

» arxiv » 2006.2268

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A comprehensive study of analyzing powers in the proton-deuteron break-up channel at 135 MeV
M. T. Bayat ; H. Tavakoli-Zaniani ; H. R. Amir-Ahmadi ; A. Deltuva ; M. Eslami-Kalantari ; J. Golak ; N. Kalantar-Nayestanaki ; St. Kistryn ; A. Kozela ; H. Mardanpour ; J. G. Messchendorp ; M. Mohammadi-Dadkan ; A. Ramazani-Moghaddam-Arani ; R. Ramazani-Sharifabadi ; R. Skibiński ; E. Stephan ; H. Witała ;
Date:	3 Jun 2020
Abstract:	A measurement of the analyzing powers for the $^2$H$(oldsymbol{p},pp)n$ break-up reaction was carried out at KVI exploiting a polarized-proton beam at an energy of 135 MeV. The scattering angles and energies of the final-state protons were measured using the Big Instrument for Nuclear-polarization Analysis (BINA) with a nearly $4pi$ geometrical acceptance. In this work, we analyzed a large number of kinematical geometries including forward-forward configurations in which both the final-state particles scatter to small polar angles and backward-forward configurations in which one of the final-state particles scatters to large polar angles. The results are compared with Faddeev calculations based on modern nucleon-nucleon (NN) and three-nucleon (3N) potentials. Discrepancies between polarization data and theoretical predictions are observed for configurations corresponding to small relative azimuthal angles between the two final-state protons. These configurations show a large sensitivity to 3N force effects.
Source:	arXiv, 2006.2268
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