The MuX Project

TL;DR

The muX project conducts advanced muonic X-ray measurements on medium- and high-Z nuclei to determine nuclear charge radii and explore atomic parity violation, utilizing innovative detection and target technologies.

Contribution

It introduces a novel hydrogen target for muon transfer and demonstrates initial measurements on radioactive Cm and Ra, supporting future parity violation experiments.

Findings

Successful measurement of radioactive Cm and Ra nuclei

Development of a new hydrogen target for muon transfer

Feasibility study for atomic parity violation experiment

Abstract

The \emph{muX} project is conducting a series of muonic X-ray measurements in medium- and high-Z nuclei at PSI, utilizing a high-purity germanium detector array, in-beam muon detectors, and a modern digital data-acquisition system. A novel hydrogen target for muon transfer was developed, enabling measurements with as little as a few micrograms of target material. First measurements with radioactive Cm and Ra targets were conducted, aimed at determining their nuclear charge radii. These serve as important input for upcoming atomic parity violation experiments. The apparatus is also used to perform a feasibility study of an atomic parity violation experiment with the $2s-1s$ muonic X-ray transition. In addition, the setup has been made available for a wider range of nuclear, particle, and solid-state physics measurements.