Speaker
Description
Nuclear interactions constitute the fundamental basis for understanding the structure of nuclear matter. However, despite significant theoretical progress—particularly within the framework of chiral effective field theory (ChEFT)—noticeable discrepancies between experimental data and theoretical predictions persist, especially in few-nucleon systems. To expand the experimental database with precise measurements of differential cross sections, the BINA detection system was installed at the CCB (Cyclotron Center Bronowice) [1,2]. The BINA setup is designed to study the elastic and breakup reactions at intermediate energies. It consists of the liquid target facility and the low threshold detector covering nearly 4π solid angle, enabling studies of almost full phase space of these reactions [3,4].
The BINA detection system will be extended by the installation of a proton polarimeter, consisting of a graphite scatterer and a Multi-Wire Drift Chamber (MWDC), enabling measurements of induced polarization [5]. The very important aspect of the project is the optimization of the graphite scatterer thickness, which directly affects essential polarimeter parameters such as detection efficiency, energy threshold for protons, and the effective analyzing power.
This optimization will be performed based on detailed Monte Carlo simulations using the Geant software package, which allow for a realistic representation of the detector geometry and particle-matter interaction processes. The simulation results will allow for the selection of a configuration that provides the best conditions for precise measurements of proton polarization, thereby contributing to a deeper understanding of multi-nucleon interactions.
[1] A. Łobejko et al., Acta Phys. Pol. B. 50, 3, p.361-366 (2019). [2] A. Łobejko, E. Stephan et al., Phys. Rev. C 111, 054001 (2025). [3] A. Ramazani-Moghaddam-Arani, et al., Phys. Rev. C 78, 014006 (2008). [4] St. Kistryn, E. Stephan, J. Phys. G: Nucl. Part. Phys. 40, 063101 (2013). [5] Grant No. 2022/45/B/ST2/03223.