B. R. Hackett
A5110688351- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Scientific Research and Discoveries
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Cosmology and Gravitation Theories
- Nuclear physics research studies
- Gamma-ray bursts and supernovae
- Photocathodes and Microchannel Plates
- Quantum, superfluid, helium dynamics
- Radioactive contamination and transfer
- Radioactivity and Radon Measurements
- Atmospheric and Environmental Gas Dynamics
- CCD and CMOS Imaging Sensors
- Isotope Analysis in Ecology
- Spacecraft and Cryogenic Technologies
- Age of Information Optimization
- Inorganic Fluorides and Related Compounds
- High-Energy Particle Collisions Research
Pacific Northwest National Laboratory
2019-2025
Battelle
2025
Fermi National Accelerator Laboratory
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2024
University of Pisa
2024
Universidade de São Paulo
2024
Royal Holloway University of London
2024
Augustana University
2024
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2024
University of Massachusetts Amherst
2022
We present the results of a search for dark matter WIMPs in mass range below 20 GeV/c^2 using target low-radioactivity argon. The data were obtained DarkSide-50 apparatus at Laboratori Nazionali del Gran Sasso (LNGS). analysis is based on ionization signal, which time projection chamber fully efficient 0.1 keVee. observed rate detector 0.5 keVee about 1.5 events/keVee/kg/day and almost entirely accounted by known background sources. obtain 90% C.L. exclusion limit above 1.8 spin-independent...
We report the first results of DarkSide-50, a direct search for dark matter operating in underground Laboratori Nazionali del Gran Sasso (LNGS) and searching rare nuclear recoils possibly induced by weakly interacting massive particles (WIMPs). The detector is Liquid Argon Time Projection Chamber with (46.4+-0.7) kg active mass, operated inside 30 t organic liquid scintillator neutron veto, which turn installed at center 1 kt water Cherenkov veto residual flux cosmic rays. here null...
We present new constraints on sub-GeV dark matter particles scattering off electrons in argon based an analysis of ionization signal data from the DarkSide-50 detector.
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,...
Liquid argon is a bright scintillator with potent particle identification properties, making it an attractive target for direct-detection dark matter searches. The DarkSide-50 search here reports the first WIMP results obtained using of low-radioactivity argon. detector, two-phase liquid time projection chamber, located at Laboratori Nazionali del Gran Sasso. underground shown to contain Ar-39 level reduced by factor (1.4 +- 0.2) x 10^3 relative atmospheric We report background-free null...
Nuclear recoil events produced by neutron scatters form one of the most important classes background in WIMP direct detection experiments, as they may produce nuclear recoils that look exactly like interactions. In DarkSide-50, we both actively suppress and measure rate neutron-induced using our veto, composed a boron-loaded liquid scintillator detector within water Cherenkov detector. This paper is devoted to description veto system including structure, fundamentals event reconstruction...
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...
Although the existence of dark matter is supported by many evidences, based on astrophysical measurements, its nature still completely unknown. One major candidate represented weakly interacting massive particles (WIMPs), which could in principle be detected through their collisions with ordinary nuclei a sensitive target, producing observable low-energy (<100 keV) nuclear recoils. The DarkSide program aims at WIPMs detection using liquid argon time projection chamber (LAr-TPC). In this...
The DarkSide-50 experiment at the Laboratori Nazionali del Gran Sasso is a search for dark matter using dual phase time projection chamber with 50 kg of low radioactivity argon as target. Light signals from interactions in are detected by system 38 photo-multiplier tubes (PMTs), 19 above and below TPC volume inside cryostat. We describe electronics which processes photo-multipliers, trigger identifies events interest, data-acquisition records data further analysis. include resistive voltage...
The primary advantage of moderately superheated bubble chamber detectors is their simultaneous sensitivity to nuclear recoils from weakly interacting massive particle (WIMP) dark matter and insensitivity electron recoil backgrounds. A comprehensive analysis PICO gamma calibration data demonstrates for the first time that in ${\mathrm{C}}_{3}{\mathrm{F}}_{8}$ scale accordance with a new nucleation mechanism, rather than one driven by hot spike as previously supposed. Using this semiempirical...
We reanalyze data collected with the DarkSide-50 experiment and recently used to set limits on spin-independent interaction rate of weakly interacting massive particles (WIMPs) argon nuclei an effective field theory framework. The dataset corresponds a total $(16660\ifmmode\pm\else\textpm\fi{}270)\text{ }\mathrm{kg}\text{ }\mathrm{d}$ exposure using target low-radioactivity extracted from underground sources. obtain upper couplings 12 leading operators in nonrelativistic systematic...
DarkSide-50 is a two phase argon TPC for direct dark matter detection which installed at the Gran Sasso underground laboratory, Italy. has 50-kg active volume and will make use of low in 39Ar. The inside an neutron veto made with boron-loaded high radiopurity liquid scintillator. 1000 m3 water Cherenkov muon veto. cryostat are assembled radon-free clean rooms to reduce radioactive contaminants. overall design aims background free exposure after selection cuts applied. expected sensitivity...
This paper describes the design, fabrication, commissioning and use of a CALibration source Insertion System (CALIS) in DarkSide-50 direct dark matter search experiment. CALIS deploys radioactive sources into liquid scintillator veto to characterize detector response detection efficiency Liquid Argon Time Projection Chamber, surrounding 30 t organic neutron veto. It was commissioned September 2014 has been used successfully several gamma campaigns since then. A description hardware an...
DarkSide-50 is a detector for dark matter candidates in the form of weakly interacting massive particles. It utilizes liquid argon time projection chamber inner main detector, surrounded by scintillator veto (LSV) and water Cherenkov (WCV). The LSV WCV act as neutron cosmogenic muon detectors DarkSide-50. This paper describes electronics data acquisition system used these two detectors. made custom built front end commercial National Instruments high speed digitizers. electronics, DAQ,...
The DarkSide experiment is designed for the direct detection of Dark Matter with a double phase liquid Argon TPC operating underground at Laboratori Nazionali del Gran Sasso. placed inside 30 tons organic scintillator sphere, acting as neutron veto, which in turn installed 1 kt water Cherenkov detector. current detector running since November 2013 50 kg atmospheric fill and we report here first null results search (1422 ± 67) kg.d exposure. This result correspond to 90% CL upper limit on...
Measurements were made of scintillation light yield alpha particles from the $^{222}$Rn decay chain within DarkSide-50 liquid argon time projection chamber. The was found to increase as applied electric field increased, with alphas in a 200 V/cm exhibiting 2% compared no field.
DarkSide is a multi-stage program devoted to direct searches of Dark Matter particles with detectors based on double phase liquid Argon Time Projection Chamber. The DarkSide-50 setup running underground at the Laboratori Nazionali del Gran Sasso. First it was operated Atmospheric and during that run (1422 ± 67) kg×d truly background-free exposure has been accumulated. Obtained data made possible set 90% C.L. upper limit WIMP-nucleon cross section 6.1 × 10−44 cm2 (for WIMP mass 100 GeV/c2)....
The DarkSide program at LNGS aims to perform background-free WIMP searches using two phase liquid argon time projection chambers, with the ultimate goal of covering all parameters down so-called neutrino floor. One distinct features is use underground has a reduced content radioactive 39Ar compared atmospheric argon. Collaboration currently operating DarkSide-50 experiment, first such detector Operations indicate suppression by factor (1.4 ± 0.2) × 103 relative new results obtained and plans...
Radioactive decays from ^{42}Ar and its progeny ^{42}K are potential background sources in large-scale liquid-argon-based neutrino dark matter experiments. In the atmosphere, is produced primarily by cosmogenic activation on ^{40}Ar. The use of low radioactivity argon cosmogenically shielded underground can expand reach sensitivity rare event searches. We estimate production nuclear reactions induced natural cosmic-ray muon-induced interactions. At 3,000 mwe, rate 1.8E-3 atoms per ton crust...
DarkSide-50 is a dark matter direct search experiment at LNGS, searching for rare nuclear recoils possibly induced by WIMPs. It has two nested vetoes and dual phase liquid argon TPC as detector. Key features of this are the use underground radio-pure target muon neutron active to suppress background. The first data-taking campaign was running from November 2013 April 2015 with an atmospheric reduced efficiency veto due internal contamination. However, upper limit on WIMP-nucleon cross...