A5065570816- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- Astrophysics and Cosmic Phenomena
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Muon and positron interactions and applications
- Scientific Research and Discoveries
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Medical Imaging Techniques and Applications
- Ammonia Synthesis and Nitrogen Reduction
- Crystallography and Radiation Phenomena
- Quantum, superfluid, helium dynamics
- Gyrotron and Vacuum Electronics Research
- CCD and CMOS Imaging Sensors
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Computational Physics and Python Applications
- Radiation Effects in Electronics
- Terahertz technology and applications
University of Washington
2017-2024
Indiana University Bloomington
2020-2024
Johannes Gutenberg University Mainz
2023-2024
Campbell Collaboration
2017-2022
Joint Institute for Nuclear Astrophysics
2021
Yale University
2014-2018
University of Wisconsin–Madison
2012-2017
The Majorana Collaboration is operating an array of high purity Ge detectors to search for neutrinoless double-β decay in ^{76}Ge. Demonstrator comprises 44.1 kg (29.7 enriched ^{76}Ge) split between two modules contained a low background shield at the Sanford Underground Research Facility Lead, South Dakota. Here we present results from data taken during construction, commissioning, and start full operations. We achieve unprecedented energy resolution 2.5 keV FWHM Q_{ββ} very with no...
The Majorana Demonstrator searched for neutrinoless double-β decay (0νββ) of ^{76}Ge using modular arrays high-purity Ge detectors operated in vacuum cryostats a low-background shield. with up to 40.4 kg (27.2 enriched ∼88% ^{76}Ge). From these measurements, the has accumulated 64.5 yr active exposure. With world-leading energy resolution 2.52 keV FWHM at 2039 Q_{ββ} (0.12%), we set half-life limit 0νββ T_{1/2}>8.3×10^{25} (90% C.L.). This provides range upper limits on m_{ββ} (113-269) meV...
COSINE is a dark matter search experiment based on an array of low background NaI(Tl) crystals located at the Yangyang underground laboratory. The assembly COSINE-100 was completed in summer 2016 and detector currently collecting physics quality data aimed reproducing DAMA/LIBRA that reported annual modulation signal. Stable operation has been achieved will continue for least two years. Here, we describe design COSINE-100, including shielding arrangement, configuration crystal detection...
The most sensitive direct method to establish the absolute neutrino mass is observation of endpoint tritium beta-decay spectrum. Cyclotron radiation emission spectroscopy (CRES) a precision spectrographic technique that can probe much unexplored range with resolution. A lower bound set by observations oscillations, while KATRIN experiment—the current-generation experiment based on magnetic adiabatic collimation an electrostatic (MAC-E) filter—will achieve sensitivity . CRES aims avoid...
The Majorana Collaboration is operating an array of high-purity Ge detectors to search for the neutrinoless double-$\ensuremath{\beta}$ decay $^{76}\mathrm{Ge}$. Demonstrator consists 44.1 kg (29.7 enriched 88% in $^{76}\mathrm{Ge}$) split between two modules constructed from ultraclean materials. Both are contained a low-background shield at Sanford Underground Research Facility Lead, South Dakota. We present updated results on $^{76}\mathrm{Ge}$ with $26.0\ifmmode\pm\else\textpm\fi{}0.5$...
The Majorana Demonstrator neutrinoless double-beta decay experiment comprises a 44 kg (30 enriched in ^{76}Ge) array of p-type, point-contact germanium detectors. With its unprecedented energy resolution and ultralow backgrounds, also searches for rare event signatures from beyond standard model physics the low region below 100 keV. In this Letter, we test continuous spontaneous localization (CSL) model, one mathematically well-motivated wave function collapse models aimed at solving...
The absolute scale of the neutrino mass plays a critical role in physics at every scale, from subatomic to cosmological. Measurements tritium end-point spectrum have provided most precise direct limit on scale. In this Letter, we present advances by Project 8 cyclotron radiation emission spectroscopy (CRES) technique culminating first frequency-based limit. With only cm^{3}-scale physical detection volume, m_{β}<155 eV/c^{2} (152 eV/c^{2}) is extracted background-free measurement continuous...
We present the first search for a dark matter annual modulation signal in Southern Hemisphere conducted with NaI(Tl) detectors, performed by DM-Ice17 experiment. Nuclear recoils from interactions are expected to yield an annually modulated independent of location within Earth's hemispheres. DM-Ice17, step DM-Ice experimental program, consists 17 kg located at South Pole under 2200 m.w.e. overburden Antarctic glacial ice. Taken over 3.6 years total exposure 60.8 yr, data consistent no energy...
We report the first analysis of background data from DM-Ice17, a direct-detection dark matter experiment consisting 17 kg NaI(Tl) target material. It was codeployed with IceCube 2457 m deep in South Pole glacial ice December 2010 and is such detector operating Southern Hemisphere. The rate 6.5 - 8.0 keVee region measured to be 7.9 +/- 0.4 counts/day/keV/kg. This consistent expected assemblies negligible contributions surrounding ice. successful deployment operation DM-Ice17 establishes as...
The COSINE-100 dark matter search experiment has started taking physics data with the goal of performing an independent measurement annual modulation signal observed by DAMA/LIBRA. A muon detector was constructed using plastic scintillator panels in outermost layer shield surrounding detector. It detects cosmic ray muons order to understand impact on analysis. Assembly and initial performance tests each module have been performed at a ground laboratory. installation Yangyang Underground...
The Majorana Demonstrator is an ultralow-background experiment searching for neutrinoless double-beta decay in ^{76}Ge. heavily shielded array of germanium detectors, placed nearly a mile underground at the Sanford Underground Research Facility Lead, South Dakota, also allows searches new exotic physics. Free, relativistic, lightly ionizing particles with electrical charge less than e are forbidden by standard model but predicted some its extensions. If such exist, they might be detected...
Ta180m is a rare nuclear isomer whose decay has never been observed. Its remarkably long lifetime surpasses the half-lives of all other known β and electron capture decays due to large K-spin differences small energy between isomeric lower-energy states. Detecting its presents significant experimental challenge but could shed light on neutrino-induced nucleosynthesis mechanisms, nature dark matter, violation. For this study, we repurposed Majorana Demonstrator, an search for neutrinoless...
With excellent energy resolution and ultralow-level radiogenic backgrounds, the high-purity germanium detectors in Majorana Demonstrator enable searches for several classes of exotic dark matter (DM) models. In this work, we report new experimental limits on keV-scale sterile neutrino DM via transition magnetic moment from conversion to active neutrinos νs→νa. We fermionic absorption (χ+A→ν+A) sub-GeV DM-nucleus 3→2 scattering (χ+χ+A→ϕ+A), exclusion bosonic (axionlike particles photons)....
Neutrino mass is a key parameter in nuclear and particle physics cosmology. The Project 8 Collaboration developed an innovative method with potential to improve the current limits by more than order of magnitude. Announced paper published last September (PRL 131, 102502; see also Synopsis at https://physics.aps.org/articles/v16/s121), measures frequency radiation from tritium $\ensuremath{\beta}$-decay electrons spiraling magnetic field. In authors provide details this unique measurement...
COSINE-100 is a dark matter direct detection experiment designed to test the annual modulation signal observed by DAMA/LIBRA experiment. consists of 8 NaI(Tl) crystals with total mass 106 kg, 2200 L liquid scintillator veto, and 37 muon detector panels. We present details data acquisition system COSINE-100, including waveform storage using flash analog-to-digital converters for crystal events integrated charge charge-sensitive plastic veto events. also discuss several trigger conditions...
The Majorana Demonstrator is searching for neutrinoless double-beta decay ($0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$) in $^{76}\mathrm{Ge}$ using arrays of point-contact germanium detectors operating at the Sanford Underground Research Facility. Background results $0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ region interest from data taken during construction, commissioning, and start full operations have been recently published. A pulse shape analysis cut applied to...
Measurements of the $\beta^-$ spectrum tritium give most precise direct limits on neutrino mass. Project 8 will investigate mass using Cyclotron Radiation Emission Spectroscopy (CRES) with an atomic source. CRES is a new experimental technique that has potential to surmount systematic and statistical limitations current-generation measurement methods. Atomic avoids irreducible uncertainty associated final states populated by decay molecular tritium. proceed in phased approach toward goal 40...
Background: The MAJORANA DEMONSTRATOR , a modular array of isotopically enriched high-purity germanium (HPGe) detectors, was constructed to demonstrate backgrounds low enough justify building tonne-scale experiment search for the neutrinoless double-beta decay ($\beta\beta(0\nu)$) $^{76}\mathrm{Ge}$. Purpose: This paper presents description instrument, its commissioning, and operations. It covers electroforming, underground infrastructure, enrichment, detector fabrication, low-background...
The COSINE-100 dark matter search experiment is an array of NaI(Tl) crystal detectors located in the Yangyang Underground Laboratory (Y2L). To understand measured backgrounds crystals we have performed Monte Carlo simulations using Geant4 toolkit and developed background models for each that consider contributions from both internal external sources, including cosmogenic nuclides. are based on comparisons measurement data with guided by a campaign material assays used to evaluate identify...
This white paper provides a comprehensive review of our present understanding experimental neutrino anomalies that remain unresolved, charting the progress achieved over last decade at and phenomenological level, sets stage for future programmatic prospects in addressing those anomalies. It is purposed to serve as guiding motivational "encyclopedic" reference, with emphasis on needs options exploration may lead ultimate resolution We see main experimental, analysis, theory-driven thrusts...
The recently developed technique of Cyclotron Radiation Emission Spectroscopy (CRES) uses frequency information from the cyclotron motion an electron in a magnetic bottle to infer its kinetic energy. Here we derive expected radio-frequency signal waveguide CRES apparatus first principles. We demonstrate that frequency-domain is rich about electron's kinematic parameters and extract set measurables suitably designed system are sufficient for disentangling energy rest features. This lays...