Muon-spin spectroscopy at continuous sources has stagnated at a stopped muons rate of ~40 kHz for the last few decades. The major limiting factor is the requirement of a single muon in the sample during the typical 10 {\mu}s data gate window. To overcome this limit and to be able to perform muon-spin relaxation ({\mu}SR) measurements on millimeter-sized samples, one can use vertex reconstruction methods to construct {\mu}SR spectra. This is now possible thanks to the availability of very thin monolithic Si-pixel chips, which offer minimal particle scattering and high count rate. Here we present results from a Si-pixel based spectrometer that utilizes vertex reconstruction schemes for the incoming muons and emitted positrons. With this spectrometer we were able to obtain a first vertex reconstructed {\mu}SR (VR-{\mu}SR) spectrum. The unique capabilities and benefits of such a spectrometer are discussed.
@article{arxiv.2503.08891,
title = {Advanced muon-spin spectroscopy with high lateral resolution using Si-pixel detectors},
author = {Lukas Mandok and Pascal Isenring and Heiko Augustin and Marius Köppel and Jonas A. Krieger and Hubertus Luetkens and Thomas Prokscha and Thomas Rudzki and André Schöning and Zaher Salman},
journal= {arXiv preprint arXiv:2503.08891},
year = {2026}
}