R. Linehan
A5002351628- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Radiation Detection and Scintillator Technologies
- Thermal properties of materials
- Planetary Science and Exploration
- High-Energy Particle Collisions Research
- Physics of Superconductivity and Magnetism
- Semiconductor materials and devices
- Nuclear Physics and Applications
- Advancements in Semiconductor Devices and Circuit Design
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Materials Characterization Techniques
- Geophysical and Geoelectrical Methods
- Nuclear and radioactivity studies
- Cosmology and Gravitation Theories
- Particle accelerators and beam dynamics
- Graphite, nuclear technology, radiation studies
- Quantum and electron transport phenomena
- Gamma-ray bursts and supernovae
- Nuclear reactor physics and engineering
- Muon and positron interactions and applications
Fermi National Accelerator Laboratory
2024-2025
SLAC National Accelerator Laboratory
2020-2024
Kavli Institute for Particle Astrophysics and Cosmology
2020-2024
Stanford University
2020-2024
University of Edinburgh
2024
Menlo School
2023
Boston University
2020-2022
University of California, Berkeley
2017-2020
Lawrence Berkeley National Laboratory
2020
Imperial College London
2019
LUX-ZEPLIN (LZ) is a next-generation dark matter direct detection experiment that will operate 4850 feet underground at the Sanford Underground Research Facility (SURF) in Lead, South Dakota, USA. Using two-phase xenon detector with an active mass of 7 tonnes, LZ search primarily for low-energy interactions weakly interacting massive particles (WIMPs), which are hypothesized to make up our galactic halo. In this paper, projected WIMP sensitivity presented based on latest background estimates...
In recent years, the lack of a conclusive detection WIMP dark matter at 10 GeV/c$^{2}$ mass scale and above has encouraged development low-threshold detector technology aimed probing lighter candidates. Detectors based on Cooper-pair-breaking sensors have emerged as promising avenue for this due to low (meV-scale) energy required breaking Cooper pair in most superconductors. Among them, devices superconducting qubits are interesting candidates sensing their observed sensitivity broken pairs....
The LUX-ZEPLIN (LZ) experiment is a dark matter detector centered on dual-phase xenon time projection chamber. We report searches for new physics appearing through few-keV-scale electron recoils, using the experiment's first exposure of 60 live days and fiducial mass 5.5 t. data are found to be consistent with background-only hypothesis, limits set models including solar axion coupling, neutrino magnetic moment millicharge, couplings galactic axionlike particles hidden photons. Similar...
Searches for dark matter with liquid xenon time projection chamber experiments have traditionally focused on the region of parameter space that is characteristic weakly interacting massive particles, ranging from a few GeV/$c^2$ to TeV/$c^2$. Models mass much heavier than this are well motivated by early production mechanisms different standard thermal freeze-out, but they generally been less explored experimentally. In work, we present re-analysis first science run (SR1) LZ experiment, an...
The LArIAT liquid argon time projection chamber, placed in a tertiary beam of charged particles at the Fermilab Test Beam Facility, has collected large samples pions, muons, electrons, protons, and kaons momentum range 300-1400 MeV/c. This paper describes main aspects detector beamline, also reports on calibrations performed for beamline components.
We present GammaTPC, a transformative 0.1-10 MeV $\gamma$-ray instrument concept featuring tracker using liquid argon time projection chamber (LAr TPC) technology with the novel GAMPix high spatial resolution and ultra low power charge readout. These enable an economical unprecedented effective area sensitivity. discuss design in some detail, including how LAr TPC can be staged space. Finally, we first study of sensitivity Compton regime new framework for analyzing telescope data.
The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double $\ensuremath{\beta}$ decay search in parallel to the main science goal of discovering dark matter particle interactions. We report expected LZ sensitivity $^{136}\mathrm{Xe}$ decay, taking advantage significant ($>600$ kg) mass contained within active volume without isotopic enrichment. After 1000 live-days, median exclusion half-life is projected be $1.06\ifmmode\times\else\texttimes\fi{}{10}^{26}$ years (90% confidence...
LUX-ZEPLIN is a dark matter detector expected to obtain world-leading sensitivity weakly-interacting massive particles interacting via nuclear recoils with $\ensuremath{\sim}7$-tonne xenon target mass. This paper presents projections several low-energy signals of the complementary electron recoil signal type: 1) an effective neutrino magnetic moment, and 2) millicharge, both for $pp$-chain solar neutrinos, 3) axion flux generated by Sun, 4) axionlike forming Galactic matter, 5) hidden...
Liquid Argon Time Projection Chambers (LArTPCs) are ideal detectors for precision neutrino physics. These detectors, when located deep underground, can also be used measurements of proton decay, and astrophysical neutrinos. The technology must completely developed, up to very large mass scales, fully mastered construct operate these this physics program. As part an integrated plan developing accurate in LArTPC known particle species the relevant energy ranges now deemed as necessary. LArIAT...
We present the first measurement of negative pion total hadronic cross section on argon in a restricted phase space, which we performed at Liquid Argon In A Testbeam (LArIAT) experiment. All reaction channels, as well elastic interactions with scattering angle greater than 5\ifmmode^\circ\else\textdegree\fi{} are included. The pions have kinetic energies range 100--700 MeV and produced by beam charged particles impinging solid target Fermilab test facility. LArIAT employs 0.24 ton active...
The projected sensitivity of the LUX-ZEPLIN (LZ) experiment to two-neutrino and neutrinoless double $\ensuremath{\beta}$ decay $^{134}\mathrm{Xe}$ is presented. LZ a 10-tonne xenon time-projection chamber optimized for detection dark matter particles expected start operating in 2021 at Sanford Underground Research Facility, USA. Its large mass natural provides an exceptional opportunity search $^{134}\mathrm{Xe}$, which detectors enriched $^{136}\mathrm{Xe}$ are less effective. For mode,...
Two-phase xenon detectors, such as that at the core of forthcoming LZ dark matter experiment, use photomultiplier tubes to sense primary (S1) and secondary (S2) scintillation signals resulting from particle interactions in their liquid target. This paper describes a simulation study exploring two techniques lower energy threshold gain sensitivity low-mass astrophysical neutrinos, which will be applicable other detectors. The is determined by number detected S1 photons; typically, these must...
Developments over the last decade have pushed search for particle dark matter (DM) to new frontiers, including keV-scale lower mass limit thermally-produced DM. Galactic DM at this is kinematically matched with energy needed break a Cooper pair in common superconductors (~meV). Quantum sensors such as superconducting qubits are sensitive these broken pairs, and can potentially be exploited low-threshold detectors particle-like scattering. The Science Center group Fermilab exploring use of...
Over the last decade, several low-energy physics searches, including those for particle dark matter, have driven interest in developing increasingly sensitive detectors. Superconducting (SC) quantum sensors based on broken Cooper Pairs provide a possible channel sensing O(meV) energy depositions, and may be significant step such low-threshold The Quantum Science Center group at Fermilab is exploring use of superconducting qubits detection LOUD surface dilution fridge facility QUIET...
We measure space- and time-correlated charge jumps on a four-qubit device, operating 107 meters below the Earth's surface in low-radiation, cryogenic facility designed for characterization of low-threshold particle detectors. The rock overburden this reduces cosmic ray muon flux by over 99% compared to laboratories at sea level. Combined with 4$\pi$ coverage movable lead shield, enables quantifiable control ionizing radiation qubit device. Long-time-series tomography measurements these...
Kinetic inductance phonon-mediated (KIPM) detectors are superconducting microcalorimeters that use microwave kinetic (MKIDs) to read out phonon signals in the device substrate. In order improve design of these detectors, we need understand effect various detector elements on physical processes take place within through simulation efforts. One figure merit for KIPM is collection efficiency, $\eta_{ph]$, defined as ratio energy detected by sensitive element and deposited incident phonons...
Kinetic inductance phonon-mediated (KIPM) detectors use microwave kinetic (MKIDs) to read out phonon signals in the substrate. They are a promising class of be used light dark matter (DM) searches due their potential eV-scale sensitivity and native frequency-domain multiplexability. In order improve upon design these detectors, simulations needed understand effects detector on measurable physical parameters including collection efficiency, $\eta_{ph}$, which is defined as ratio energy...
Understanding phonon and charge propagation in superconducting devices plays an important role both performing low-threshold dark matter searches limiting correlated errors qubits. The Geant4 Condensed Matter Physics (G4CMP) package, originally developed for the Cryogenic Dark Search (CDMS) experiment, models transport within silicon germanium detectors has been validated by experimental measurements of caustics, mean charge-carrier drift velocities, heat pulse times. In this work, we...