A measurement of the analyzing powers for the 2H(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 4π 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.
@article{arxiv.2006.02268,
title = {A comprehensive study of analyzing powers in the proton-deuteron break-up channel at 135 MeV},
author = {M. T. Bayat and H. Tavakoli-Zaniani and H. R. Amir-Ahmadi and A. Deltuva and M. Eslami-Kalantari and J. Golak and N. Kalantar-Nayestanaki and St. Kistryn and A. Kozela and H. Mardanpour and J. G. Messchendorp and M. Mohammadi-Dadkan and A. Ramazani-Moghaddam-Arani and R. Ramazani-Sharifabadi and R. Skibiński and E. Stephan and H. Witała},
journal= {arXiv preprint arXiv:2006.02268},
year = {2020}
}