The Pion-Nucleon coupling constant from np charge exchange scattering

Abstract

A novel extrapolation method has been used to deduce the charged Pion-Nucleon coupling constant from backward $np$ differential scattering cross sections. We applied it to new measurements performed at 162 MeV at the The Svedberg Laboratory in Uppsala. In the angular range $150^{\circ }-180^{\circ }$, the carefully normalized data are steeper than those of most previous measurements. The extracted value, $g_{{\pi }^{\pm }}^2=14.52\pm 0.26$, in good agreement with the classical value, is higher than those determined in recent nucleon-nucleon partial-wave analyses.

Comments: 6 pages, 3 encapsulated figures, epsfig, menu97.cls (included)