S. Chashin
A5020876643- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Scientific Research and Discoveries
- Neutrino Physics Research
- Photocathodes and Microchannel Plates
- Spacecraft and Cryogenic Technologies
- Age of Information Optimization
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Superconducting Materials and Applications
- Inorganic Fluorides and Related Compounds
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Planetary Science and Exploration
- Radioactive contamination and transfer
- Quantum, superfluid, helium dynamics
- Methane Hydrates and Related Phenomena
- Gamma-ray bursts and supernovae
- Gaussian Processes and Bayesian Inference
Lomonosov Moscow State University
2021-2025
Moscow State University
2024-2025
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2023
Institute of Nuclear Physics
2022
We report on the search for dark matter weakly interacting massive particles (WIMPs) in mass range below $10\text{ }\text{ }\mathrm{GeV}/{\mathrm{c}}^{2}$, from analysis of entire dataset acquired with a low-radioactivity argon target by DarkSide-50 experiment at Laboratori Nazionali del Gran Sasso. The new benefits more accurate calibration detector response, improved background model, and better determination systematic uncertainties, allowing us to accurately model rate spectra down...
We present a search for dark matter particles with sub-GeV/c^{2} masses whose interactions have final state electrons using the DarkSide-50 experiment's (12 306±184) kg d low-radioactivity liquid argon exposure. By analyzing ionization signals, we exclude new parameter space matter-electron cross section σ[over ¯]_{e}, axioelectric coupling constant g_{Ae}, and photon kinetic mixing κ. also set first direct-detection constraints on angle |U_{e4}|^{2} keV/c^{2} sterile neutrinos.
Dark matter elastic scattering off nuclei can result in the excitation and ionization of recoiling atom through so-called Migdal effect. The energy deposition from electron adds to deposited by nuclear system allows for detection interactions sub-GeV/c^{2} mass dark matter. We present new constraints using dual-phase liquid argon time projection chamber DarkSide-50 experiment with an exposure (12 306±184) kg d. analysis is based on signal alone significantly enhances sensitivity DarkSide-50,...
Dark matter lighter than 10 GeV/c$^2$ encompasses a promising range of candidates. A conceptual design for new detector, DarkSide-LowMass, is presented, based on the DarkSide-50 detector and progress toward DarkSide-20k, optimized low-threshold electron-counting measurement. Sensitivity to light dark explored various potential energy thresholds background rates. These studies show that DarkSide-LowMass can achieve sensitivity down solar neutrino floor GeV-scale masses significant MeV/c$^2$...
Abstract Future liquid-argon DarkSide-20k and Argo detectors, designed for direct dark matter search, will be sensitive also to core-collapse supernova neutrinos, via coherent elastic neutrino-nucleus scattering. This interaction channel is flavor-insensitive with a high-cross section, enabling high-statistics neutrino detection target masses of ∼50 t ∼360 respectively. Thanks the low-energy threshold ∼0.5 keV nr achievable by exploiting ionization channel, have potential discover bursts...
Abstract Aria is a plant hosting $${350}\,\hbox {m}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>350</mml:mn><mml:mspace/><mml:mtext>m</mml:mtext></mml:mrow></mml:math> cryogenic isotopic distillation column, the tallest ever built, which being installed in mine shaft at Carbosulcis S.p.A., Nuraxi-Figus (SU), Italy. one of pillars argon dark-matter search experimental program, lead by Global Argon Dark Matter Collaboration. It was designed to reduce abundance...
Abstract We present a novel approach for the search of dark matter in DarkSide-50 experiment, relying on Bayesian Networks. This method incorporates detector response model into likelihood function, explicitly maintaining connection with quantity interest. No assumptions about linearity problem or shape probability distribution functions are required, and there is no need to morph signal background spectra as function nuisance parameters. By expressing terms Networks, we have developed an...
Abstract The stability of a dark matter detector on the timescale few years is key requirement due to large exposure needed achieve competitive sensitivity. It especially crucial enable potentially detect any annual event rate modulation, an expected signature. In this work, we present performance history DarkSide-50 dual-phase argon time projection chamber over its almost three-year low-radioactivity run. particular, focus electroluminescence signal that enables sensitivity sub-keV energy...
Abstract DarkSide-20k is a novel liquid argon dark matter detector currently under construction at the Laboratori Nazionali del Gran Sasso (LNGS) of Istituto Nazionale di Fisica Nucleare (INFN) that will push sensitivity for Weakly Interacting Massive Particle (WIMP) detection into neutrino fog. The core apparatus dual-phase Time Projection Chamber (TPC), filled with 50 tonnes low radioactivity underground (UAr) acting as WIMP target. NUV-HD-cryo Silicon Photomultipliers (SiPM)s designed by...
Abstract DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ∼ 100 t of low radioactivity argon from an underground source (UAr) its inner detector, with half serving as target dual-phase time projection chamber (TPC). The UAr cryogenics system must maintain stable thermodynamic conditions throughout experiment's lifetime over 10 years. Continuous removal impurities and radon essential for...
Abstract The Aria cryogenic distillation plant, located in Sardinia, Italy, is a key component of the DarkSide-20k experimental program for WIMP dark matter searches at INFN Laboratori Nazionali del Gran Sasso, Italy. designed to purify argon, extracted from underground wells Colorado, USA, and used as target material, detector-grade quality. In this paper, we report first measurement argon isotopic separation by with 26 m tall prototype. We discuss operating parameters column observation...
The activation of materials due to exposure cosmic rays may become an important background source for experiments investigating rare event phenomena. DarkSide-20k, currently under construction at the Laboratori Nazionali del Gran Sasso, is a direct detection experiment galactic dark matter particles, using two-phase liquid-argon Time Projection Chamber (TPC) filled with 49.7 tonnes (active mass) Underground Argon (UAr) depleted in 39Ar. Despite outstanding capability discriminating...
Abstract The direct search for dark matter in the form of weakly interacting massive particles (WIMP) is performed by detecting nuclear recoils produced a target material from WIMP elastic scattering. experimental identification direction WIMP-induced crucial asset this field, as it enables unmistakable modulation signatures matter. Recoil Directionality (ReD) experiment was designed to probe such directional sensitivity argon dual-phase time projection chambers (TPC), that are widely...
Dark matter may induce an event in Earth-based detector, and its rate is predicted to show annual modulation as a result of the Earth’s orbital motion around Sun. We searched for this signature using ionization signal DarkSide-50 liquid argon time projection chamber. No significant compatible with dark observed electron recoil equivalent energy range above <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mn>40</a:mn><a:mtext> </a:mtext><a:mtext>...
The dual-phase liquid argon time projection chamber is presently one of the leading technologies to search for dark matter particles with masses below 10 GeV c−2. This was demonstrated by DarkSide-50 experiment approximately 50 kg low-radioactivity as target material. next generation DarkSide-20k, currently under construction, will use 1,000 times more and expected start operation in 2027. Based on experience, here we assess DarkSide-20k sensitivity models predicting light particles,...
Dark matter induced event rate in an Earth-based detector is predicted to show annual modulation as a result of the Earth's orbital motion around Sun. We searched for this signature using ionization signal DarkSide-50 liquid argon time projection chamber. No significant compatible with dark observed electron recoil equivalent energy range above $40~{\rm eV_{ee}}$, lowest threshold ever achieved such search.
Abstract Proportional electroluminescence (EL) in noble gases is used two-phase detectors for dark matter searches to record (in the gas phase) ionization signal induced by particle scattering liquid phase. The “standard” EL mechanism considered be due excimer emission vacuum ultraviolet (VUV). In addition, there are two alternative mechanisms, producing light visible and near infrared (NIR) ranges. first bremsstrahlung of electrons scattered on neutral atoms (“neutral bremsstrahlung”,...
The dual-phase liquid argon time projection chamber is presently one of the leading technologies to search for dark matter particles with masses below 10 GeV/c$^2$. This was demonstrated by DarkSide-50 experiment approximately 50 kg low-radioactivity as target material. next generation DarkSide-20k, currently under construction, will use 1,000 times more and expected start operation in 2027. Based on experience, here we assess DarkSide-20k sensitivity models predicting light particles,...
The direct search for dark matter in the form of weakly interacting massive particles (WIMP) is performed by detecting nuclear recoils (NR) produced a target material from WIMP elastic scattering. A promising experimental strategy employs argon dual-phase time projection chambers (TPC). One advantages TPC capability to detect both scintillation and charge signals NRs. Furthermore, existence drift electric field breaks rotational symmetry: angle between momentum recoiling nucleus can...
The stability of a dark matter detector on the timescale few years is key requirement due to large exposure needed achieve competitive sensitivity. It especially crucial enable potentially detect any annual event rate modulation, an expected signature. In this work, we present performance history DarkSide-50 dual-phase argon time projection chamber over its almost three-year low-radioactivity run. particular, focus electroluminescence signal that enables sensitivity sub-keV energy...
Experiments aimed at direct searches for WIMP dark matter require highly effective reduction of backgrounds and control any residual radioactive contamination. In particular, neutrons interacting with atomic nuclei represent an important class due to the expected similarity a WIMP-nucleon interaction, so that such experiments often feature dedicated neutron detector surrounding active target volume. context development DarkSide-20k INFN Gran Sasso National Laboratory (LNGS), several R&D...
DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ~100 t of low radioactivity argon from an underground source (UAr) its inner detector, with half serving as target dual-phase time projection chamber (TPC). The UAr cryogenics system must maintain stable thermodynamic conditions throughout experiment's lifetime >10 years. Continuous removal impurities and radon essential for maximising signal...
Abstract Experiments aimed at direct searches for WIMP dark matter require highly effective reduction of backgrounds and control any residual radioactive contamination. In particular, neutrons interacting with atomic nuclei represent an important class due to the expected similarity a WIMP-nucleon interaction, so that such experiments often feature dedicated neutron detector surrounding active target volume. context development DarkSide-20k INFN Gran Sasso National Laboratory (LNGS), several...