Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 78: Electroweak Interactions II

T 78.5: Talk

Thursday, March 18, 2021, 17:00–17:15, Tc

The muX experiment at the Paul Scherrer Institute — •Frederik Wauters — PRISMA+ Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg University Mainz

When a negative muon comes to rest in matter, an exotic atom is quickly formed. During the formation process, muonic X-rays, which can have energies up to several MeV, are emitted until the 1s orbital is reached. The muon wave function in the lower orbits has a large overlap with the nucleus, making this system an excellent laboratory to study short range interactions between the muon and the atomic nucleus. The muX project at the Paul Scherrer Institute is performing muonic X-ray measurements on medium and high-Z nuclei, thereby fully exploiting the coverage and multiplicity of a full high-purity germanium array in combination with muon, electron and neutron detectors. A new technique was developed utilizing transfer reaction in a H2/D2 gas cell to stop a standard muon beam in a few ug of target material. The physics program is focusing on atomic parity violation (APV). A measurement of the charge radius of 226Ra will serve as an important input for an upcoming APV experiment with Ra in a Paul trap. We are also pursuing measuring APV directly in muonic atoms in the 2s-1s transition. As a short term goal, we want to significantly improve the signal to noise for this low intensity transition. In this talk I will present the preliminary results of the 2017, 2018, and 2019 experimental campaigns.