Description: The KOALA experiment for (anti)proton

This title appears in the Scientific Report : 2021

The KOALA experiment for (anti)proton–proton elastic scattering

The KOALA experiment measures the differential cross section of (anti)proton–proton elastic scattering over a wide range of four-momentum transfer squared from 0.0008 to 0.1 (GeV/c)2. These data are essential input for the PANDA experiment to reach the desired absolute precision for the integrated l...

Personal Name(s):	Zhou, Yong (Corresponding author)
	Xu, Huagen (Corresponding author) / Bechstedt, Ulf / Böker, Jürgen / Demary, Nils / Goldenbaum, Frank / Grzonka, Dieter / Hetzel, Jan / Khoukaz, Alfons / Klehr, Franz / Krings, Thomas / Lessmann, Lukas / Mannweiler, Christian / Prasuhn, Dieter / Quilitzsch, Steffen / Ritman, James / Schadmand, Susan / Sefzick, Thomas / Stassen, Rolf / Wüstner, Peter
Contributing Institute:	Zentralinstitut für Elektronik; ZEA-2 IKP- Technische und Administrative Infrastruktur; IKP-TA Kernphysikalische Großgeräte; IKP-4 Experimentelle Hadronstruktur; IKP-1
Published in:	Nuclear instruments & methods in physics research / A, 1019 (2021) S. 165849 -
Imprint:	Amsterdam North-Holland Publ. Co. 2021
DOI:	10.1016/j.nima.2021.165849
Document Type:	Journal Article
Research Program:	Cosmic Matter in the Laboratory FAIR (GSI)
Link:	OpenAccess Restricted
	Publikationsportal JuSER

Please use the identifier: http://hdl.handle.net/2128/29165 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.nima.2021.165849 in citations.

The KOALA experiment measures the differential cross section of (anti)proton–proton elastic scattering over a wide range of four-momentum transfer squared from 0.0008 to 0.1 (GeV/c)2. These data are essential input for the PANDA experiment to reach the desired absolute precision for the integrated luminosity determination. The KOALA experiment is based on fixed target kinematics and uses an internal hydrogen cluster jet target. The wide range of is achieved by measuring the total kinetic energy of the recoil protons near 90. The recoil detector consists of silicon and germanium single-sided strip sensors with an energy resolution of approximately 20 keV and 30 keV (FWHM), respectively. 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. By requiring a coincidence of the forward detector with the recoil detector, the large background at small recoil angles is suppressed, thereby improving the identification of elastic scattering events in the low range. The KOALA setup has been installed and commissioned with proton beam at COSY in order to validate the detector by measuring the proton–proton elastic scattering. The results from this commissioning are presented here.