2025/11/04 by Artibani, Francesco, Abbene, Leonardo, Buttacavoli, Antonino +37 · 1 citation
Engineering · Physics and Astronomy · #Advanced Semiconductor Detectors and Materials #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Particle Detector Development and Performance
paper · doi:10.48550/arxiv.2511.02671
openalex publication_date 2025/11/04 · openalex created_date 2025/11/06 · openalex updated_date 2026/07/28
This work presents the results of a time-based event selection for searching X-ray signals from kaonic atom X-ray transition using a single quasi-hemispherical Cadmium-Zinc-Telluride (CZT) detector at the DAΦNE collider. To mitigate the high background level in the measured X-ray spectrum, a dedicated event selection strategy was developed, exploiting the precise timing correlation between e+e- collisions and detector signals. This approach enabled, for the first time, the observation of two characteristic X-ray transitions from kaonic aluminum atoms using a CZT detector: for the 5-4 transition at 50~keV, 362~±~41~(stat.)~±~20~(sys.) signal events over 1698~±~197~(stat.)~±~25~(sys.) background events in 5σ were observed, with a resolution of 9.2%~FWHM; for the 4-3 transition at 106~keV, 295~±~50~(stat.)~±~20~(sys.) signal events over 2939~±~500~(stat.)~±~16~(sys.) background events in 5σ were measured, with a resolution of 6.6 ~FWHM. A strong background suppression of approximately 95% of the triggered data was achieved through this time-based selection. The demonstrated timing capability of the CZT detector proved highly effective in isolating time-correlated events within an 80 ns window, setting an important benchmark for the application of these semiconductors in timing-based X-ray spectroscopy. These results highlight the potential of CZT-based detection systems for future precision measurements in high-radiation environments, paving the way for compact, room-temperature X-ray and γ-ray spectrometers in fundamental physics and beyond.