بلورة باردة تصطاد المادة المظلمة سريع

الملخص الأصلي

كما كتبه المؤلفون، بالإنجليزية arXiv:2608.11303v1

We report the first temperature-dependent characterization of a NaI(Tl) crystal readout by two silicon photomultipliers (SiPMs) directly coupled to opposite ends of the crystal for rare-event searches. A $$6 \text{ mm} \times 6 \text{ mm} \times 13 \text{ mm}$$ NaI(Tl) crystal was directly coupled to two SiPMs and characterized in a liquid nitrogen-cooled cryostat over a temperature range of 94$$-$$293 K. The light yield, energy resolution, and scintillation decay time were measured using $$\gamma$$-ray peak from a $$^{241}$$Am source. After correcting for optical crosstalk contributions, the light yield increased, reaching $$17.7 \pm 1.1$$ photoelectrons/keV at 238 K, corresponding to a 34.5% enhancement relative to room temperature (293 K). Furthermore, dual-channel configuration effectively suppresses random thermal noise via coincidence triggers, which together with the observed increase in light yield, provides a critical pathway toward lowering the energy threshold for dark matter and coherent elastic neutrino$$-$$nucleus scattering searches.