First QUARTET physics result submitted
The first physics result of QUARTET, the nuclear charge radius of beryllium-9 from muonic atom spectroscopy, has been submitted for publication.
The measurement used metallic magnetic calorimeters (MMCs) from KIP Heidelberg at the Paul Scherrer Institute. Results on lithium and boron are close to publication, and oxygen is under analysis. Preprint: O. Eizenberg et al., arXiv:2607.13690.
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