Measurement of the π+p--> analyzing power at 68.3 MeV
Abstract
The analyzing power Ay for π+p--> scattering at 68.3 MeV has been measured at the Paul Scherrer Institut with the magnetic spectrometer LEPS. The measurements cover the angular range 40°<=θlab<=70°. The protons have been polarized in a butanol target, operated in frozen spin mode. The S31 phase shift comes out by about 1° smaller than the Koch-Pietarinen [Nucl. Phys. A 336, 331 (1980)] phase shift analysis, supporting the necessity of an alternative dispersion analysis of πN scattering to determine the σ term and the πN coupling constant.
- Publication:
-
Physical Review C
- Pub Date:
- October 1996
- DOI:
- 10.1103/PhysRevC.54.1930
- Bibcode:
- 1996PhRvC..54.1930W
- Keywords:
-
- 13.75.Gx;
- 24.70.+s;
- 25.80.Dj;
- Pion-baryon interactions;
- Polarization phenomena in reactions;
- Pion elastic scattering