The KOALA Experiment for (anti)proton-proton Elastic Scattering
Abstract
The KOALA experiment measures the differential cross section of (anti)proton-proton elastic scattering over a wide range of four-momentum transfer squared 0.0008 < |t| < 0.1 (GeV/c) . The forward scattering parameters and the absolute luminosity can be deduced by analyzing the characteristic shape of the differential cross-section spectrum. The experiment is based on fixed target kinematics and uses an internal hydrogen cluster jet target. The wide range of |t| is achieved by measuring the total kinetic energy of the recoil protons near 90{\deg} with a recoil detector, which consists of silicon and germanium single-sided strip sensors. The energy resolution of the recoil detector is better than 30 keV (FWHM). A forward detector consisting of two layers of plastic scintillators measures the elastically scattered beam particles in the forward direction close to the beam axis. It helps suppress the large background at small recoil angles and improves the identification of elastic scattering events in the low |t| range. The KOALA setup has been installed and commissioned at COSY in order to validate the detector by measuring the proton-proton elastic scattering. The results from this commissioning are presented here.
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Cite
@article{arxiv.2103.09914,
title = {The KOALA Experiment for (anti)proton-proton Elastic Scattering},
author = {Yong Zhou and Huagen Xu and Ulf Bechstedt and Jürgen Böker and Nils Demary and Frank Goldenbaum and Dieter Grzonka and Jan Hetzel and Alfons Khoukaz and Franz Klehr and Thomas Krings and Lukas Lessmann and Christian Mannweiler and Dieter Prasuhn and Steffen Quilitzsch and James Ritman and Susan Schadmand and Thomas Sefzick and Rolf Stassen and Peter Wüstner},
journal= {arXiv preprint arXiv:2103.09914},
year = {2021}
}