Measurement of the absolute n p scattering differential cross section at 194 MeV.
/ Authors
M. Sarsour, T. Peterson, M. Planinić, S. Vigdor, C. Allgower, B. Bergenwall, J. Blomgren, T. Hossbach, W. Jacobs, C. Johansson
and 12 more authors
J. Klug, A. Klyachko, P. Nadel-Turonski, L. Nilsson, N. Olsson, S. Pomp, J. Rapaport, T. Rinckel, E. Stephenson, U. Tippawan, S. Wissink, Yaoqi Zhou
/ Abstract
We describe a double-scattering experiment with a novel tagged neutron beam to measure differential cross sections for np backscattering to better than +/-2% absolute precision. The measurement focuses on angles and energies where the cross section magnitude and angle dependence constrain the charged pion-nucleon coupling constant, but existing data show serious discrepancies among themselves and with energy-dependent partial-wave analyses. The present results are in good accord with the partial-wave analyses, but deviate systematically from other recent measurements.
Journal: Physical review letters