Kaonic copper and fluorine absolute yields measurement with a CZT-based detection system at DAΦNE

作者：Francesco Artibani Simone Manti, Simone Manti, L. Abbene, Antonino Buttacavoli, Manuele Bettelli, G. Gerardi, F. Principato, Andrea Zappettini, M. Bazzi, Giacomo Borghi, Damir Bosnar, Mario Bragadireanu, Marco Carminati, Alberto Clozza, F. Clozza, Raffaele Del Grande, Luca De Paolis, Carlo Fiorini, Ivica Friscic, Carlo Guaraldo, Mihail Iliescu, Masahiko Iwasaki, A. Khreptak, Johann Marton, Pawel Moskal, F. Napolitano, Hiroaki Ohnishi, Kristian Piscicchia, Francesco Sgaramella, Michal Silarski, Florin Sirghi, Florin Sirghi, M. Skurzok, A. Spallone, Kairo Toho, Oton Vazquez Doce, Johann Zmeskal, Catalina Curceanu, A Scordo · 发表于：Journal of Physics G Nuclear and Particle Physics · 年份：2026 · DOI：10.1088/1361-6471/ae9f75 · 研究领域：X-ray Spectroscopy and Fluorescence Analysis、High-Energy Particle Collisions Research、High-pressure geophysics and materials

Abstract In this work, new measurements of absolute X-ray yields for several transitions in kaonic copper and, for the first time, in kaonic fluorine are reported. The data were collected by the SIDDHARTA-2 collaboration at the DAΦNE collider using a novel room-temperature Cadmium Zinc Telluride (CZT) detection system. Detection efficiencies were evaluated through a dedicated Geant4 Monte Carlo simulation of the full experimental setup, enabling the extraction of absolute yields per stopped kaon. The measured yields exhibit a systematic dependence on the principal quantum number, reflecting the interplay between radiative transitions, Auger de-excitation, and strong-interaction-induced nuclear capture. In kaonic fluorine, a suppression of the 4→3 transition yield relative to higher-n transitions is observed, providing evidence for the onset of strong-interaction effects already at the n=4 level. From this behaviour, a conservative lower limit on the corresponding strong-interaction width is derived. These results provide new quantitative constraints for cascade models of exotic atoms and extend experimental access to intermediate atomic levels where strong-interaction effects are not directly observable via level shifts and widths. They also establish CZT-based detection as a powerful and versatile approach for high-resolution X-ray spectroscopy of kaonic atoms in collider environments.