From 19 June 2025 to 17 July 2025, I completed an internship at the Max Planck Institute for Nuclear Physics (MPIK) in Heidelberg, Germany. My internship, supervised by Thierry Lasserre, focused on the study of the expected signal and the statistical analysis of simulated spectra related to the capture of relic neutrinos. Several models were developed to reproduce the data, relying on minimization procedures and sensitivity studies. The data collected comes from the fifth measurement campaign of the KATRIN experiment. Understanding this experimental operation, from the tritium source to the pixelated detector, allowed me to realise the technical complexity of the importance of instrumental choices in extracting results. 

This internship was initially an introduction to the world of research. In addition, I was able to expand my knowledge of particle physics, cosmology and mathematical models for scientific data analysis. Beyond the scientific aspects, this internship provided me with a valuable learning experience. I was able to develop a variety of skills, ranging from theoretical modelling to numerical analysis, as well as understanding experimental constraints and critically interpreting results. I also became aware of the difficulty of this type of research, where the rarity of the signal and the importance of background noise require rigour, patience and creativity in data processing.

This internship is a key step in my career, preparing me to tackle complex research projects in the field of astroparticle physics and, more broadly, high-energy physics.