Nucleon-nucleon scattering analyses. III.<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>np</mml:mi></mml:math>phase-shift analyses: Complex structure and multiple solutions at 50 and 325 MeV

Abstract

Recent comprehensive analyses of $n\ensuremath{-}p$ data near 50 and 325 MeV reveal a complex ${\ensuremath{\chi}}^{2}$ hypersurface with nonquadratic behavior at 50 MeV and multiple minima at 325 MeV. We present the "most reasonable" solutions at these energies and present graphically some of the complex ${\ensuremath{\chi}}^{2}$ structure which invalidates the conventional measure of error on the resultant phase parameters.NUCLEAR REACTIONS $n+p$ phase-shift analyses, 50 and 325 MeV.