A5084394949- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Radio Astronomy Observations and Technology
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Gamma-ray bursts and supernovae
- Atmospheric Ozone and Climate
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- Astronomical Observations and Instrumentation
- Ionosphere and magnetosphere dynamics
- Radiation Therapy and Dosimetry
- Calibration and Measurement Techniques
- Precipitation Measurement and Analysis
- History and Developments in Astronomy
- Pulsars and Gravitational Waves Research
- Photocathodes and Microchannel Plates
- Atmospheric aerosols and clouds
- High-Energy Particle Collisions Research
- Solar and Space Plasma Dynamics
- Particle Accelerators and Free-Electron Lasers
- Radio Wave Propagation Studies
- Computational Physics and Python Applications
- Atmospheric and Environmental Gas Dynamics
University of Chicago
2011-2025
Fermi National Accelerator Laboratory
2011-2025
University of Illinois Chicago
2024
Electronics for Imaging (United States)
2021-2024
University of Washington
2024
Institute of Astronomy and Space Physics
2011-2023
Universidad Nacional de La Plata
2011-2023
University of Buenos Aires
2011-2023
Consejo Nacional de Investigaciones Científicas y Técnicas
2010-2023
National University of General San Martín
2016-2023
We report direct-detection constraints on light dark matter particles interacting with electrons. The results are based a method that exploits the extremely low levels of leakage current DAMIC detector at SNOLAB 2-6$\times$10$^{-22}$ A cm$^{-2}$. evaluate charge distribution pixels collect $<10~\rm{e^-}$ for contributions beyond may be attributed to interactions. Constraints placed so-far unexplored parameter space masses between 0.6 and 100 MeV$c^{-2}$. also present new hidden-photon in...
We report constraints on sub-GeV dark matter particles interacting with electrons from the first underground operation of DAMIC-M detectors. The search is performed an integrated exposure 85.23 g days, and exploits subelectron charge resolution low level current charge-coupled devices (CCDs). Dark-matter-induced ionization signals above detector are searched for in CCD pixels up to 7e^{-}. With this dataset we place limits mass between 0.53 1000 MeV/c^{2}, excluding unexplored regions...
We present constraints on the existence of weakly interacting massive particles (WIMPs) from an 11 kg-day target exposure DAMIC experiment at SNOLAB underground laboratory. The observed energy spectrum and spatial distribution ionization events with electron-equivalent energies $>$200 eV$_{\rm ee}$ in CCDs are consistent backgrounds natural radioactivity. An excess is above analysis threshold 50 ee}$. While origin this low-energy requires further investigation, our data exclude...
Dark matter (DM) particles with sufficiently large cross sections may scatter as they travel through Earth’s bulk. The corresponding changes in the DM flux give rise to a characteristic daily modulation signal detectors sensitive DM-electron interactions. Here, we report results obtained from first underground operation of DAMIC-M prototype detector searching for such MeV-scale mass. A model-independent analysis finds no rate <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
We present results from a 3.25 kg-day target exposure of two silicon charge-coupled devices (CCDs), each with 24 megapixels and skipper readout, deployed in the DAMIC setup at SNOLAB. With reduction pixel readout noise factor 10 relative to previous detector, we investigate excess population low-energy events CCD bulk previously observed above expected backgrounds. address dominant systematic uncertainty analysis through depth fiducialization designed reject surface backgrounds on CCDs. The...
We construct the first comprehensive radioactive background model for a dark matter search with charge-coupled devices (CCDs). leverage well-characterized depth and energy resolution of DAMIC at SNOLAB detector detailed geant4-based particle-transport simulation to both bulk surface backgrounds from natural radioactivity down 50 eVee. fit distributions observed ionization events differentiate constrain possible sources, example, 3H silicon cosmogenic activation 210Pb radon plate-out. observe...
A bstract Oscura is a planned light-dark matter search experiment using Skipper-CCDs with total active mass of 10 kg. As part the detector development, collaboration plans to build Integration Test (OIT), an engineering test 10% mass. Here we discuss early science opportunities OIT for millicharged particles (mCPs) NuMI beam at Fermilab. mCPs would be produced low energies through photon-mediated processes from decays scalar, pseudoscalar, and vector mesons, or direct Drell-Yan productions....
The puzzle of ultra-high energy cosmic rays (UHECRs) still remains unresolved. With the progress in preparation next generation experiments (AUGER, EUSO, OWL), importance directional analysis existing and future events is increasing. Galactic Magnetic Field (GMF) plays key role source identification even this range. We first analyze current status our experimental theoretical knowledge about GMF introduce a complex up-to-date model GMF. Then we present two examples simple applications...
We report the first direct measurement of overall characteristics microwave radio emission from extensive air showers. Using a trigger provided by KASCADE-Grande shower array, signals antennas Cosmic-Ray Observation via Microwave Emission experiment have been read out and searched for signatures high-energy showers in GHz frequency range. detected more than 30 with energies above 3×10^{16} eV. The observations presented this Letter are consistent mainly forward-directed polarized process...
Experiments aiming to directly detect dark matter through particle recoils can achieve energy thresholds of $\mathcal{O}(1\,\mathrm{eV})$. In this regime, ionization signals from small-angle Compton scatters environmental $\gamma$-rays constitute a significant background. Monte Carlo simulations used build background models have not been experimentally validated at these low energies. We report precision measurement scattering on silicon atomic shell electrons down 23$\,$eV. A skipper...
Abstract Oscura is a proposed multi-kg skipper-CCD experiment designed for dark matter (DM) direct detection search that will reach unprecedented sensitivity to sub-GeV DM-electron interactions with its 10 kg detector array. planning operate at SNOLAB 2070 m overburden, and aims background goal of less than one event in each electron bin the 2–10 ionization-signal region full 30 kg-year exposure, radiation rate 0.01 dru.[1 dru (differential unit) corresponds 1 event/kg/day/keV.] In order...
We report a measurement of the energy spectrum cosmic rays above $2.5{\times} 10^{18}$ eV based on $215,030$ events. New results are presented: at about $1.3{\times} 10^{19}$ eV, spectral index changes from $2.51 \pm 0.03 \textrm{ (stat.)} 0.05 (sys.)}$ to $3.05 (stat.)}\pm 0.10\textrm{ (sys.)}$, evolving $5.1\pm0.3\textrm{ 0.1\textrm{ beyond $5{\times} while no significant dependence features declination is seen in accessible range. These can be reproduced models with energy-dependent mass...
The DAMIC-M (DArk Matter In CCDs at Modane) experiment employs thick, fully depleted silicon charged-coupled devices (CCDs) to search for dark matter particles with a target exposure of 1 kg-year. A novel skipper readout implemented in the provides single electron resolution through multiple non-destructive measurements individual pixel charge, pushing detection threshold eV-scale. will advance by several orders magnitude exploration particle hypothesis, particular candidates pertaining...
We present a discovery and observation of an extraordinarily bright prompt optical emission the GRB 060117 obtained by wide-field camera atop robotic telescope FRAM Pierre Auger Observatory from 2 to 10 minutes after GRB. found rapid average temporal flux decay alpha = -1.7 +- 0.1 peak brightness R 10.1 mag. Later observations other instruments set strong limit on radio transient fluxes, unveiling unexpectedly further decay. interpretation featuring relatively steep electron-distribution...
The production of $^{3}$H, $^{7}$Be, and $^{22}$Na by interactions cosmic-ray particles with silicon can produce radioactive backgrounds in detectors used to search for rare events. Through controlled irradiation CCDs wafers a neutron beam that mimics the spectrum, followed direct counting, we determined rate from neutrons at sea level is ($112 \pm 24$) atoms/(kg day) ($8.1 1.9 $) ($43.0 7.1 $^{22}$Na. Complementing these results current best estimates activation cross sections other than...
FRAM—F/(Ph)otometric Robotic Atmospheric Monitor is one of the atmospheric monitoring instruments at Pierre Auger Observatory in Argentina. FRAM an optical telescope equipped with CCD cameras and photometer, it automatically observes a set selected standard stars. Primarily, observations are used to obtain wavelength dependence light extinction. also able observe secondary astronomical targets, namely detection counterparts gamma‐ray bursts has already proven be successful. Finally,...
The origin of the highest energy Galactic cosmic rays is still not understood, nor transition to EeV extragalactic particles. Scientific progress requires enhancements existing air-shower arrays, such as: IceCube with its surface detector IceTop, and low-energy extensions both Telescope Array Pierre Auger Observatory.
Radio emission from air showers enables measurements of cosmic particle kinematics and identity. The radio signals are detected in broadband Megahertz antennas among continuous background noise. We present two deep learning concepts their performance when applied to simulated data. first network classifies time traces as signal or background. achieve a true positive rate about 90% for signal-to-noise ratios larger than three with false below 0.2%. other is used clean the trace recover...
We report on the measurement of microwave radio signals from air showers with CROME (Cosmic Ray Observation via Microwave Emission) experiment. is located in center KASCADE-Grande shower array. The antennas are stored for each high-energy trigger array and matched offine data. After almost one year data taking have been observed more than ten showers.
Oscura is a proposed multi-kg skipper-CCD experiment designed for dark matter (DM) direct detection search that will reach unprecedented sensitivity to sub-GeV DM-electron interactions with its 10 kg detector array. planning operate at SNOLAB 2070 m overburden, and aims background goal of less than one event in each electron bin the 2-10 ionization-signal region full 30 kg-year exposure, radiation rate 0.01 dru. In order achieve this goal, must address potential source events, including...