Study of the proton-proton collisions at 1683 MeV/c K. N. Ermakov, V. A. Nikonov, O. V. Rogachevsky, A. V. Sarantsev, V. V. Sarantsev and S. G. Sherman Eur. Phys. J. A, 53 6 (2017) 122 Published online: 14 June 2017 DOI: 10.1140/epja/i2017-12322-6