Gießen 2024 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 51: Instrumentation XIII
HK 51.5: Talk
Wednesday, March 13, 2024, 18:30–18:45, HBR 19: C 2
Beam and Target Optimization for the KOALA Experiment — •Ruijia Yang1,2, Frank Goldenbaum1,2, and Huagen Xu2 for the PANDA collaboration — 1Bergische Universität Wuppertal — 2Forschungszentrum Jülich GmbH
The KOALA experiment is aimed to measure (anti)proton-proton elastic scattering over a wide range of four momentum transfer squared 0.0008<|t|<0.1(GeV/c)2 in order to precisely determine the differential cross section. The wide range of |t| is achieved by measuring the total kinetic energy as well as the recoil angle α(=90∘-θ) from -1.8∘ to 15∘ of the recoil protons with a recoil detector consisting of silicon and germanium single-sided strip sensors. The large background at small |t| can be suppressed by measuring the elastically scattered beam particles in the forward direction close to the beam axis with a forward detector, which contains two layers of plastic scintillators. It is noted that the finite thickness of the target profile and the residual gas in the scattering chamber play critical roles at such small recoil angles (α<1.2∘), while attempting to achieve the expected smallest |t|. Meanwhile it is also observed that the beam imperfection such as large profile and offset to beam axis introduces a non-negligible impact on the measurement precision. As a compensation for the missing acceptance at the forward region, a larger scintillator detector has been implemented. The simulation study based upon KoalaSoft for the influence of the realistic target profile, residual gas in the scattering chamber as well as the beam imperfection is ongoing. The latest results of the study will be presented.
Keywords: elastic scattering