Conveners
Light/charge response in Noble Elements
- Davide Franco (APC)
Light/charge response in Noble Elements
- Theresa Fruth (University of Sydney)
Two-phase liquid argon detectors measure ionization signals by detecting electroluminescence light produced by ionization electrons extracted from liquid into gas under a strong electric field. Xenon-doping of argon at the few percent level in the liquid phase populates xenon in the gas phase at the 10s of ppm level, which perpetuates energy transfer from 128 nm Ar2 dimer light to 147 nm and...
The X-ArT (Xenon-Argon Technology) collaboration has studied the scintillation mechanisms in pure and Xe-doped liquid argon (LAr) using silicon photomultipliers sensitive to different wavelength ranges. Thanks to our measurements we identified a long-lived (>10μs) component attributed to extreme ultraviolet (EUV) photons emitted by the metastable levels of atomic argon. Based on this...
Liquid xenon time projection chambers (LXe TPCs) exhibit delayed photon and electron signals occurring long after an initial interaction. While they represent a significant background for low-energy searches, the origin of these delayed signals remains not fully understood. We explore the hypothesis that vacuum ultraviolet (VUV) scintillation photons from xenon induce delayed photoluminescence...
We present the development and initial results of an experimental setup designed to measure the vacuum ultraviolet (VUV) reflectivity of materials commonly used in argon and xenon-based detectors. The system consists of a monochromator coupled to a sealed black box chamber filled with ultra-pure argon gas. A photosensor mounted on a motorized rotation stage enables angular-resolved...
The increasing size of liquid argon and xenon time projection chambers introduces new challenges related to higher event rates in the active volume. A key concern is pile-up, the overlap of multiple events within the maximum drift time, which can lead to S1–S2 misidentification and increased dead time. We discuss possible mitigation strategies, including optimized event selection and advanced...
Recently, dual-phase xenon detectors have observed indication of solar boron-8 neutrino CEvNS signals, which demonstrates a promising sensitivity of light mass dark matter detection through xenon. One key issue for is to have a precise measurement of the signal response of low energy nuclear recoil in xenon. In this talk, I will discuss the nuclear recoil signal model parameter determination...
Precise knowledge of ionization and scintillation yields at high energies is crucial for liquid xenon detectors, particularly for rare-event searches such as neutrinoless double-beta decay. While low-energy yields are extensively studied, data above 100 keV remain limited. Using XENONnT data and a time-coincidence identification method, we present yield measurements from the clean beta decay...
Liquid noble time proportional chambers (TPCs) are one of the most widely used scintillators in particle detection due to their low cost, high availability, and excellent scintillation properties. Many experiments in the neutrino and dark matter sectors are based on this detection technique. Here, we present a first principles study of the total quanta yield for liquid noble elements and the...
