Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 55: Structure and Dynamics of Nuclei XII
HK 55.4: Vortrag
Donnerstag, 13. März 2025, 18:30–18:45, HS 2 Physik
Probing the surface of stable nuclei with antiprotons - the first phase of the PUMA experiment — •Moritz Schlaich1, Alexandre Obertelli1, Frank Wienholtz1, Clara Klink2, Jonas Fischer1, and Lukas Nies2 — 1Technische Universität Darmstadt, Institut für Kernphysik, Darmstadt, Germany — 2CERN, Genf, Schweiz
PUMA (antiProton Unstable Matter Annihilation) is a new experiment at the Antimatter Factory at CERN since 2021 [1]. It aims to use low-energy antiprotons as a probe for the nucleonic composition on the surface of both stable and exotic nuclei. For this, antiprotons are trapped together with the ions of interest to form antiprotonic atoms. As a result, the antiprotons will annihilate with a proton or a neutron in the tail of the nuclear density distribution. This process yields annihilation products dominated by pions whose total electric charge allows the reconstruction of the isospin distribution and thus provides access to a new observable: the neutron-to-proton annihilation ratio. These insights offer a new perspective for the investigation of quantum phenomena such as nuclear halos and neutron skins.
In the first phase of the experiment, the experimental technique will be applied to stable ions provided by a versatile offline ion source setup. This contribution provides an overview of the current status of the PUMA experiment at the Antimatter Factory and discusses the latest results of the PUMA offline ion source setup.
[1] T. Aumann et al., Eur. Phys. J. A (2022) 58:88
[2] D. Adhikari et al., PREX, Phys. Rev. Lett. 126 (2021) 172502
Keywords: Antiprotonische Atome; PUMA; Antiproton decelerator; Nuclear structure; low-energy ion beams