SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 15: Instrumentation VI

HK 15.2: Vortrag

Dienstag, 21. März 2023, 17:15–17:30, SCH/A117

The PUMA trap setup at ELENA — •Alexander Schmidt for the PUMA collaboration — IKP TU Darmstadt

The antiProton Unstable Matter Annihilation (PUMA) experiment at CERN will provide the ratio of protons and neutrons in the nuclear density tail as a new observable to test nuclear structure theories. To determine this ratio, the concept of antiprotonic atoms is used. After capture onto an antiprotonic orbital, the antiproton cascades towards the nucleus and eventually annihilates with a nucleon in the tail of the nuclear density distribution [1].

As there is no facility worldwide which provides both low-energy antiprotons and radioactive ions, PUMA uses a transportable setup which combines a cryogenic Penning trap for the long-term storage of antiprotons after accumulation at the ELENA ring and a detection system for the identification of pions originating from annihilations of antiprotons and ions of interest, which are either provided by the offline ion source of PUMA at ELENA, for experiments with stable nuclei, or the ISOLDE facility at CERN for investigating radioactive nuclei.

The first commissioning of a part of the PUMA beam line is currently performed at the Antimatter factory at CERN. This talk will give an status report of the trap and cryostat development and its foreseen implementation for the upcoming ELENA beam time starting in April 2023.

[1] Aumann T. et al., PUMA, antiProton unstable matter annihilation. Eur. Phys. J. A 58, 88 (2022).