EPJ

2023 Impact factor 4.2
EPJ C - Particles and Fields
Particles and Fields

Eur. Phys. J. C 10, 409-413
DOI 10.1007/s100529900109

Measurement of the pp analyzing power in the vicinity of 2.20 GeV

J. Ball1,2 - M. Beddo3 - Y. Bedfer1,2 - J. Bystrický2 - P.-A. Chamouard1 - M. Combet1,2 - Ph. Demierre4 - J.-M. Fontaine1,2 - G. Gaillard4 - D. Grosnick3 - R. Hess4 - R. Kunne1 - F. Lehar2 - A. de Lesquen2 - D. Lopiano3 - D. Rapin4 - J.-L. Sans1 - H M. Spinka3

1 Laboratoire National SATURNE, CNRS/IN2P3 and CEA/DSM, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France
2 DAPNIA, CEA/Saclay, F-91191 Gif-sur-Yvette Cedex, France
3 Argonne National Laboratory, HEP Division, 9700 South Cass Avenue, Argonne, IL 60439, USA
4 DPNC, University of Geneva, 24 quai Ernest-Ansermet, CH-1211 Geneva 4, Switzerland

Received: 24 March 1999 / Published online: 12 August 1999

Abstract
The pp elastic scattering analyzing power was measured in small energy steps in the vicinity of the accelerator depolarizing resonance $\gamma G= 6 $ at 2.202 GeV. A vertically polarized proton beam was extracted from SATURNE II at energies above the resonance and passed through different copper degraders. The beam was focused on the beam line polarimeter CH2 target. Its halo was removed by four powerful magnets. Measurements at degraded energies were complemented by data obtained with the directly extracted polarized beam outside the resonance region. Analyzing power results at fixed laboratory angles are compared with existing data in the region under discussion, with polynomial fits from 1.6 to 3.5 GeV, and with phase shift analysis predictions.

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