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

doi:10.1140/epja/s10050-020-00255-0

arXiv · 2006.02268

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

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Abstract

A measurement of the analyzing powers for the $^2$H$(\vec{p},pp)n$ 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 $4\pi$ 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.

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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. 2020-06-03. A comprehensive study of analyzing powers in the proton-deuteron break-up channel at 135 MeV. https://doi.org/10.1140/epja/s10050-020-00255-0

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