K. J. Palladino
A5002420607- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Radio Astronomy Observations and Technology
- Cosmology and Gravitation Theories
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Nuclear Physics and Applications
- Radiation Therapy and Dosimetry
- Quantum, superfluid, helium dynamics
- Quantum Chromodynamics and Particle Interactions
- Nuclear reactor physics and engineering
- Graphite, nuclear technology, radiation studies
- Gamma-ray bursts and supernovae
- Functional Brain Connectivity Studies
- Arctic and Antarctic ice dynamics
- Hyperglycemia and glycemic control in critically ill and hospitalized patients
- Inertial Sensor and Navigation
- Spacecraft and Cryogenic Technologies
- Astronomical Observations and Instrumentation
- Diabetes and associated disorders
- Gyrotron and Vacuum Electronics Research
University of Wisconsin–Madison
2016-2025
Science Oxford
2023-2024
University of Oxford
2021-2024
University of Edinburgh
2020-2024
Lux Research (United States)
2020
Moscow Engineering Physics Institute
2017-2019
SLAC National Accelerator Laboratory
2016-2018
Menlo School
2016-2018
Kavli Institute for Particle Astrophysics and Cosmology
2016-2018
Stanford University
2016-2018
We report constraints on spin-independent weakly interacting massive particle (WIMP)-nucleon scattering using a 3.35×104 kg day exposure of the Large Underground Xenon (LUX) experiment. A dual-phase xenon time projection chamber with 250 active mass is operated at Sanford Research Facility under Lead, South Dakota (USA). With roughly fourfold improvement in sensitivity for high WIMP masses relative to our previous results, this search yields no evidence nuclear recoils. At 50 GeV c−2,...
We present constraints on weakly interacting massive particles (WIMP)-nucleus scattering from the 2013 data of Large Underground Xenon dark matter experiment, including 1.4×104 kg day search exposure. This new analysis incorporates several advances: single-photon calibration at scintillation wavelength, improved event-reconstruction algorithms, a revised background model events originating detector walls in an enlarged fiducial volume, and calibrations decays injected tritium β source...
We present experimental constraints on the spin-dependent WIMP-nucleon elastic cross sections from total 129.5 kg-year exposure acquired by Large Underground Xenon experiment (LUX), operating at Sanford Research Facility in Lead, South Dakota (USA). A profile likelihood ratio analysis allows 90% CL upper limits to be set WIMP-neutron (WIMP-proton) section of $\sigma_n$ = 1.6$\times 10^{-41}$ cm$^{2}$ ($\sigma_p$ 5$\times 10^{-40}$ cm$^{2}$) 35 GeV$c^{-2}$, almost a sixfold improvement over...
The Antarctic Impulsive Transient Antenna (ANITA) completed its second long-duration balloon flight in January 2009, with 31 days aloft (28.5 live days) over Antarctica. ANITA searches for impulsive coherent radio Cherenkov emission from 200 to 1200 MHz, arising the Askaryan charge excess ultra-high energy neutrino-induced cascades within ice. This included significant improvements first payload sensitivity, efficiency, and a trajectory deeper Analysis of in-flight calibration pulses surface...
We report new limits on cosmic neutrino fluxes from the test flight of Antarctic Impulsive Transient Antenna (ANITA) experiment, which completed an 18.4 day a prototype long-duration balloon payload, called ANITA-lite, in early 2004. search for impulsive events that could be associated with ultrahigh energy interactions ice and derive constrain several models rule out long-standing -burst model.
We present experimental constraints on the spin-dependent WIMP (weakly interacting massive particle)-nucleon elastic cross sections from LUX data acquired in 2013. is a dual-phase xenon time projection chamber operating at Sanford Underground Research Facility (Lead, South Dakota), which designed to observe recoil signature of galactic WIMPs scattering nuclei. A profile likelihood ratio analysis 1.4×104 kg day fiducial exposure allows 90% C.L. upper limits be set WIMP-neutron (WIMP-proton)...
We report on observations of coherent, impulsive radio Cherenkov radiation from electromagnetic showers in solid ice. This is the first observation Askaryan effect As part complete validation process for ANITA experiment, we performed an experiment at Stanford Linear Accelerator Center June 2006 using a 7.5 metric ton ice target. measure time large-scale angular dependence pattern, major factor determining solid-angle acceptance ultrahigh-energy neutrino detectors.
As part of the Snowmass process, Cosmic Frontier WIMP Direct Detection subgroup (CF1) has drawn on input from and broader Particle Physics community to produce this document. The charge CF1 was (a) summarize current status projected sensitivity direct detection experiments worldwide, (b) motivate dark matter searches over a broad parameter space by examining spectrum models, (c) establish consensus type experimental program required explore that space, (d) identify common infrastructure...
The scattering of dark matter (DM) particles with sub-GeV masses off nuclei is difficult to detect using liquid xenon-based DM search instruments because the energy transfer during nuclear recoils smaller than typical detector threshold. However, tree-level DM-nucleus diagram can be accompanied by simultaneous emission a bremsstrahlung photon or so-called "Migdal" electron. These provide an electron recoil component experimental signature at higher energies corresponding recoil. presence...
We report the observation of 16 cosmic ray events with a mean energy $1.5\ifmmode\times\else\texttimes\fi{}{10}^{19}\text{ }\text{ }\mathrm{eV}$ via radio pulses originating from interaction air shower Antarctic geomagnetic field, process known as geosynchrotron emission. present measurements in 300--900 MHz range, which are first self-triggered, ultrawide band, far-field, and highest sample collected technique. Their properties inconsistent current ground-based models. The emission is 100%...
The first searches for axions and axionlike particles with the Large Underground Xenon experiment are presented. Under assumption of an axioelectric interaction in xenon, coupling constant between electrons ${g}_{\mathrm{Ae}}$ is tested using data collected 2013 exposure totaling 95 live days $\ifmmode\times\else\texttimes\fi{}118\text{ }\text{ }\mathrm{kg}$. A double-sided, profile likelihood ratio statistic test excludes larger than...
We report on four radio-detected cosmic-ray (CR) or CR-like events observed with the Antarctic Impulsive Transient Antenna (ANITA), a NASA-sponsored long-duration balloon payload. Two of were previously identified as stratospheric CR air showers during ANITA-I flight. A third was detected ANITA-II Here we characteristics these three unusual events, which develop nearly horizontally, 20-30~km above surface Earth. In addition, fourth steeply upward-pointing radio event has consistent primary...
We present the potential sensitivity of a future recoil detector for first detection process coherent elastic neutrino nucleus scattering (CEνNS). use Chooz reactor complex in France as our luminous source neutrinos. Leveraging ability to cleanly separate rate correlated with thermal power against (uncorrelated) backgrounds, we show that 10 kg cryogenic bolometric array 100 eV threshold should be able extract CEνNS signal within one year running.
We present measurements of the electron-recoil (ER) response LUX dark matter detector based upon 170 000 highly pure and spatially uniform tritium decays. reconstruct energy spectrum using combined model find good agreement with expectations. report average charge light yields ER events in liquid xenon at 180 $105\text{ }\text{ }\mathrm{V}/\mathrm{cm}$ compare results to NEST model. also measure mean recombination fraction its fluctuations, we investigate location width band. These provide...
We report initial results of the first flight Antarctic Impulsive Transient Antenna (ANITA-1) 2006-2007 Long Duration Balloon flight, which searched for evidence a diffuse flux cosmic neutrinos above energies E(nu) approximately 3 x 10(18) eV. ANITA-1 flew 35 days looking radio impulses due to Askaryan effect in neutrino-induced electromagnetic showers within ice sheets. here on our analysis, was performed as blind search data. No neutrino candidates are seen, with no detected physics...
Dual-phase xenon detectors, as currently used in direct detection dark matter experiments, have observed elevated rates of background electron events the low energy region. While this negatively impacts detector performance various ways, its origins only been partially studied. In paper we report a systematic investigation pathologies LUX experiment. We characterize different populations based on their emission intensities and correlations with preceding depositions detector. By studying...
The Large Underground Xenon (LUX) experiment is a dual-phase liquid xenon time projection chamber (TPC) operating at the Sanford Research Facility in Lead, South Dakota. A calibration of nuclear recoils was performed $\textit{in situ}$ LUX detector using collimated beam mono-energetic 2.45 MeV neutrons produced by deuterium-deuterium (D-D) fusion source. recoil energy from first neutron scatter TPC reconstructed measured scattering angle defined double-scatter events within active volume. We...
The DEAP-3600 experiment is located 2 km underground at SNOLAB, in Sudbury, Ontario. It a single-phase detector that searches for dark matter particle interactions within 1000-kg fiducial mass target of liquid argon. A first generation prototype (DEAP-1) with 7-kg argon demonstrated high level pulse-shape discrimination (PSD) reducing β/γ backgrounds and helped to develop low radioactivity techniques mitigate surface-related α backgrounds. Construction the nearly complete commissioning...
This work presents an analysis of monoenergetic electronic recoil peaks in the dark-matter-search and calibration data from first underground science run Large Underground Xenon (LUX) detector. Liquid xenon charge light yields for energies between 5.2 661.7 keV are measured, as well energy resolution LUX detector at those same energies. Additionally, there is interpretation existing measurements descriptions electron-ion recombination fluctuations liquid limiting cases a more general re-...
Various dark matter models predict annual and diurnal modulations of interaction rates in Earth-based experiments as a result the Earth's motion halo. Observation such features can provide generic evidence for detection interactions. This paper reports search both rate LUX experiment using over 20 calendar months data acquired between 2013 2016. focuses on electron recoil events at low energies, where leptophilic interactions are expected to occur DAMA has observed strong modulation two...