Author(s): Ze-an Peng, Christoph H. Keitel, and Jörg Evers Future applications of the spectrally narrow x-ray resonances in Mössbauer nuclei require x-ray sources with exceptionally high peak and average spectral flux. Here, we introduce a superradiant parametric Mössbauer radiation (SPMR) source, which utilizes the scattering of spatially microstructured e… [Phys. Rev. Lett. 137, 035001] Published Wed Jul 15, 2026