Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 39: Instrumentation VIII

HK 39.4: Group Report

Wednesday, April 1, 2020, 18:00–18:30, J-HS D

KOALA experiment commissioning at COSY — •Huagen Xu — Forschungszentrum Juelich, Juelich, DE

The prime motivation of the KOALA experiment is the study of antiproton-proton elastic scattering at small momentum transfers at HESR. Since the evaluation of the pure Coulomb differential cross section, which proportional to 1/t², is unambiguous, a measurement in the region of Coulomb dominance would determine the pp luminosity in an independent way and allow parameters of the pp interaction to be extracted. The idea of KOALA is to measure the scattered beam antiprotons at forward angles by fast timing detector and the recoil target protons near 90^∘ by energy detectors.

To verify the method of KOALA a recoil detector has been built and successfully commissioned at former ANKE hydrogen cluster target station at COSY. It was found that the high rate of background limits the measurement to be extended to the desired small momentum transfer t. In order to suppress the background a forward detector consisting of scintillator bars has been built for the KOALA commissioning at COSY by measuring the pp elastic scattering. So far, the full KOALA setup has been installed at COSY. The latest results of KOALA commissioning measurements at COSY will be presented.