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

arXiv - PHYS - Nuclear Experiment Pub Date : 2024-07-09 DOI:arxiv-2407.06721

Claude Amsler, Horst Breuker, Marcus Bumbar, Matti Cerwenka, Giovanni Costantini, Rafael Ferragut, Markus Fleck, Marco Giammarchi, Angela Gligorova, Giulia Gosta, Eric David Hunter, Carina Killian, Bernadette Kolbinger, Viktoria Kraxberger, Naofumi Kuroda, Moritz Lackner, Marco Leali, Giancarlo Maero, Valerio Mascagna, Yasuyuki Matsuda, Stefano Migliorati, Daniel James Murtagh, Amit Nanda, Lilian Nowak, Simon Rheinfrank, Massimiliano Romé, Martin C. Simon, Minori Tajima, Valerio Toso, Stefan Ulmer, Martin van Beuzekom, Luca Venturelli, Alina Weiser, Eberhard Widmann, Yasunori Yamazaki, Johann Zmeskal

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Abstract

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, sub-keV 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.

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固体薄靶中反质子静止湮灭以及与蒙特卡罗模拟的比较

尽管之前开展了大量的实验和理论工作，但人们对反质子-核静止湮灭的机理还不完全了解。在这项研究中，我们利用从欧洲核子研究中心 ASACUSA 仪器中缓慢提取的亚千伏反质子，测量了带电粒子的倍率以及反质子静止湮灭在碳、钼和金三种不同核上的能量沉积。结果与 Geant4 和 FLUKA 模拟工具中不同模型的预测结果进行了比较。目前还缺少一个能解释所有观测到的特征的模型，也缺少在低能下的测量结果来验证这些模型。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv - PHYS - Nuclear Experiment

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