Eur. Phys. J. A (2005) 23: 351-364
https://doi.org/10.1140/epja/i2004-10081-1

Excitation functions of the analyzing power in elastic proton-proton scattering from 0.45 to 2.5 GeV

¹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115, Bonn, Germany
² Institut für Experimentalphysik, Universität Hamburg, D-22761, Hamburg, Germany
³ Institut für Kernphysik, Forschungszentrum Jülich, D-52425, Jülich, Germany

^* e-mail: hinterberger@hiskp.uni-bonn.de

Received: 8 July 2004
Accepted: 17 September 2004
Published online: 23 December 2004

Abstract

Excitation functions A _N(p _lab,Θ_c.m.) of the analyzing power in elastic proton-proton scattering have been measured in an internal target experiment at the Cooler Synchrotron COSY with an unpolarized proton beam and a polarized atomic hydrogen target. Data were taken continuously during the acceleration and deceleration for proton kinetic energies T _lab (momenta p _lab) between 0.45 and 2.5 GeV (1.0 and 3.3 GeV/c) and scattering angles 30 ^° ⩽ Θ_c.m. ⩽ 90^°. The results provide excitation functions and angular distributions of high precision and internal consistency. The data can be used as calibration standard between 0.45 and 2.5 GeV. They have significant impact on phase shift solutions, in particular on the spin triplet phase shifts between 1.0 and 1.8 GeV.