Erlangen 2026 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster Session

HK 27.10: Poster

Wednesday, March 18, 2026, 16:15–18:30, Redoutensaal

Improving the ALPACA particle-gamma spectrometer for telescope based particle identification — •Nick Marx, Markus Müllenmeister, Michael Weinert, and Andreas Zilges — University of Cologne, Institute for Nuclear Physics, Germany

Studying nuclear reactions requires precise particle identification (PID) [1], especially when multiple particles are generated in similar energy regions. The current work assesses the capabilities of Passivated Implanted Planar Silicon (PIPS) detectors operating in a telescope configuration, similar to the setup used in the SONIC@HORUS array [2]. The objective is to determine whether it is capable of accurately distinguishing between protons, deuterons, and tritons and whether the resolution is improved by new thin detectors. The detector performance was tested using deuteron beams at 10*MeV and 18*MeV at the FN Tandem accelerator of the University of Cologne. Measurements included both scattering and nuclear reactions on a ¹⁹⁷Au target in the ALPACA scattering chamber [3] to evaluate energy resolution and particle identification under realistic experimental conditions. First results demonstrate the achievable energy resolution and PID performance. These findings allow a direct comparison and evaluation of the improved detector setup for upcoming experiments.

[1] G. F. Knoll, Radiation Detection and Measurement, 4th ed., Wiley, Hoboken (2010).

[2] S. G. Pickstone et al., Nucl. Instr. and Meth. A 875 (2017) 104.

[3] G. Huppelsberg, Master*s thesis, University of Cologne (2024).

Keywords: particle spectroscopy; particle identification; ΔE-E telescopes; neutron transfer reactions; scattering