Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 59: Structure and Dynamics of Nuclei X

HK 59.3: Talk

Friday, April 3, 2020, 11:45–12:00, J-HS E

Current Status of the PUMA Project — Jonas Fischer, Erik Friedrich, Yuki Kubota, Noritsugu Nakatsuka, Alexandre Obertelli, •Alexander Schmidt, and Frank Wienholtz for the PUMA collaboration — TU Darmstadt, Darmstadt, Germany

The antiProton Unstable Matter Annihilation (PUMA) project aims at the investigation of the outermost density tail for the protons and neutrons of short-lived nuclei by the use of low-energy antiprotons at CERN. A special focus will be set on medium mass neutron-rich nuclei, for which a thick neutron skin or a neutron halo has been predicted but a solid experimental proof is still missing. In order to quantify if a nucleus has a halo or a neutron skin, the surface of the nucleus will be investigated by the means of annihilations with antiprotons. In these annihilation processes the produced energy is mainly carried away by charged and neutral pions, whose sum of the charges is equal to the sum of charges of the antiproton and the annihilated nucleon, which will allow us to distinguish between neutron and proton annihilations. Based on detecting and identifying all produced charged pions, the measurements will determine the ratio of protons to neutrons on the surface of the nucleus.

This contribution will provide an overview of the current status of the PUMA project with a special focus on the proof-of-principle setup for the diagnostics and the trapping scheme. It is supported by the ERC-COG through grant no. 726276.