Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations

• Main Authors: Amsler, Claude, Breuker, Horst, Bumbar, Marcus, Cerwenka, Matti, Costantini, Giovanni, Ferragut, Rafael, Fleck, Markus, Giammarchi, Marco, Gligorova, Angela, Gosta, Giulia, Hunter, Eric David, Killian, Carina, Kolbinger, Bernadette, Kraxberger, Viktoria, Kuroda, Naofumi, Lackner, Moritz, Leali, Marco, Maero, Giancarlo, Mascagna, Valerio, Matsuda, Yasuyuki, Migliorati, Stefano, Murtagh, Daniel James, Nanda, Amit, Nowak, Lilian, Rheinfrank, Simon, Romé, Massimiliano, Simon, Martin C, Tajima, Minori, Toso, Valerio, Ulmer, Stefan, van Beuzekom, Martin, Venturelli, Luca, Weiser, Alina, Widmann, Eberhard, Yamazaki, Yasunori, Zmeskal, Johann
• Format: Journal Article
• Language: English
• Published: 09-07-2024
• Subjects: Physics - Nuclear Experiment
• DOI: 10.48550/arxiv.2407.06721

The mechanism of antiproton-nucleus annihilation at rest is not fully
understood, despite substantial previous experimental and theoretical work. In
this study we used slow extracted antiprotons from the ASACUSA apparatus at
CERN to measure the charged particle multiplicities and their energy deposits
from antiproton annihilations at rest on three different nuclei: carbon,
molybdenum and gold. The results are compared with predictions from different
models in the simulation tools Geant4 and FLUKA. A model that accounts for all
the observed features is still missing, as well as measurements at low
energies, to validate such models.