A5060232127- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- Nuclear physics research studies
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Medical Imaging Techniques and Applications
- Video Surveillance and Tracking Methods
- Image and Signal Denoising Methods
- Image Processing Techniques and Applications
- Cosmology and Gravitation Theories
- Chemical and Physical Properties of Materials
- CCD and CMOS Imaging Sensors
- Optical Imaging and Spectroscopy Techniques
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Infrared Target Detection Methodologies
- Crystallography and Radiation Phenomena
- Advanced Memory and Neural Computing
- Nuclear Physics and Applications
- Magnetic confinement fusion research
University of South Dakota
2019-2024
Los Alamos National Laboratory
2023
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...
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...
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)....
Axions were originally proposed to explain the strong-$CP$ problem in QCD. Through axion-photon coupling, Sun could be a major source of axions, which measured solid state detection experiments with enhancements due coherent Primakoff-Bragg scattering. The Majorana Demonstrator experiment has searched for solar axions set $^{76}\mathrm{Ge}$-enriched high purity germanium detectors using 33 kg-yr exposure collected between January, 2017 and November, 2019. A temporal-energy analysis gives new...
P-type point contact (PPC) HPGe detectors are a leading technology for rare event searches due to their excellent energy resolution, low thresholds, and multi-site rejection capabilities. We have characterized PPC detector's response $\alpha$ particles incident on the sensitive passivated p+ surfaces, previously poorly-understood source of background. The detector studied is identical those in MAJORANA DEMONSTRATOR experiment, search neutrinoless double-beta decay ($0\nu\beta\beta$)...
P-type point contact (PPC) high-purity germanium detectors are an important technology in astroparticle and nuclear physics due to their superb energy resolution, low noise, pulse shape discrimination capabilities. Analysis of data from the Majorana Demonstrator, a neutrinoless double-β decay experiment deploying PPC enriched Ge76, has led several novel improvements analysis signals. In this work we discuss charge trapping its effect on resolution. Small dislocations or impurities crystal...
Abstract The Majorana Demonstrator comprises two arrays of high-purity germanium detectors constructed to search for neutrinoless double-beta decay in 76 Ge and other physics beyond the Standard Model. Its readout electronics were designed have low electronic noise, radioactive backgrounds minimized by using low-mass components low-radioactivity materials near detectors. This paper provides a description all electronics, spanning front-end internal cabling, back-end digitizer, power...
The majorana demonstrator is a neutrinoless double-β decay search consisting of low-background modular array high-purity germanium detectors, ∼2/3 which are enriched to 88% in 76Ge. experiment also searching for double-beta 76Ge excited states (e.s.) 76Se. can into three daughter 76Se, with clear event signatures ββ-decay followed by the prompt emission one or two γ rays. This results high probability multi-detector coincidences. granularity detector enables powerful discrimination this...
Abstract Investigated in this work were sensitivities of a prototype detector for the detection low-mass dark matter particles produced at Spallation Neutron Source Oak Ridge National Laboratory 2 years data taking. The presumed consisted 10 kg undoped CsI or NaI scintillation crystals directly coupled with SiPM arrays operated 77 K. Compared to COHERENT CsI(Na) detector, much higher light yield was assumed prototype. An experiment cylindrical 1 crystal two photomultiplier tubes about K...
Abstract The Majorana Demonstrator was a search for neutrinoless double-beta decay (0 νββ ) in the 76 Ge isotope. It staged at 4850-foot level of Sanford Underground Research Facility (SURF) Lead, SD. experiment consisted 58 germanium detectors housed low background shield and calibrated once per week by deploying 228 Th line source 1 to 2 hours. energy scale calibration determination detector array automated using custom analysis tools. We describe offline procedure detectors, including...
The Majorana Demonstrator is a leading experiment searching for neutrinoless double-beta decay with high purity germanium (HPGe) detectors. Machine learning provides new way to maximize the amount of information provided by these detectors, but data-driven nature makes it less interpretable compared traditional analysis. An interpretability study reveals machine's decision-making logic, allowing us learn from machine feed back In this work, we present first analysis data Demonstrator; also...
The MAJORANA DEMONSTRATOR is a neutrinoless double-beta decay (0νβ β ) experiment containing ∼30 kg of p-type point-contact germanium detectors enriched to 88% in 76 Ge and ∼14 natural detectors.The are housed two electroformed copper cryostats surrounded by graded passive shield with an active muon veto.An extensive radioassay campaign was performed prior installation insure the use ultra-clean materials.The achieved one lowest background rates region 0νβ Q-value, 15.7 ± 1.4 cts/(FWHM t y)...
Abstract The MAJORANA DEMONSTRATOR is searching for double-beta decay of 76 Ge to excited states (E.S.) in Se using a modular array high purity Germanium detectors. can into three E.S.s Se. E.S. decays have clear event signature consisting ββ -decay with the prompt emission one or two γ -rays, resulting probability multi-site event. granularity detector enables powerful discrimination this from backgrounds. Using 21.3 kg-y isotopic exposure, has set world leading limits each decay, 90% CL...
Experiments searching for very rare processes such as neutrinoless double-beta decay require a detailed understanding of all sources background. Signals from radioactive impurities present in construction and detector materials can be suppressed using number well-understood techniques. Background situ cosmogenic interactions reduced by siting an experiment deep underground. However, the next generation experiments have unprecedented sensitivity goals ${10}^{28}$ years half-life with...
Neutron captures and delayed decays of reaction products are common sources backgrounds in ultra-rare event searches. In this work, we studied $^{13}$C($\alpha,n)^{16}$O reactions induced by $\alpha$-particles emitted within the calibration \textsc{Majorana Demonstrator}. These thorium-based standards enclosed carbon-rich materials. The rate was estimated using 6129-keV $\gamma$-rays from excited $^{16}$O states that populated when incoming exceed Q-value. Thanks to excellent energy...
Support Vector Machine (SVM) is a state-of-the-art classification method widely used in science and engineering due to its high accuracy, ability deal with dimensional data, flexibility modeling diverse sources of data. In this paper, we propose an autotuning-based optimization framework quantify the ranges hyperparameters SVMs identify their optimal choices, apply two mixed-kernel between Sigmoid Gaussian kernels for smart pixel datasets energy physics (HEP) heterojunction transistors...
As particle physics experiments evolve to achieve higher energies and resolutions, handling the massive data volumes produced by silicon pixel detectors, which are used for charged tracking, poses a significant challenge. To address challenge of transport from high resolution tracking systems, we investigate support vector machine (SVM)-based classification system designed reject low-momentum particles in real-time. This SVM achieves accuracy through use customized mixed kernel function, is...
The background index is an important quantity which used in projecting and calculating the half-life sensitivity of neutrinoless double-beta decay ($0\nu\beta\beta$) experiments. A novel analysis framework presented to calculate using specific activities, masses simulated efficiencies experiment's components as distributions. This Bayesian includes a unified approach combine activities from assay. Monte Carlo uncertainty propagation build distribution activity, mass efficiency method applied...
The background index (BI) is an important quantity to project and calculate the half-life sensitivity of neutrinoless double-$\ensuremath{\beta}$ decay $(0\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta})$ experiments. An analysis framework presented BI using specific activities, masses, simulated efficiencies experiments components as distributions. This Bayesian includes a unified approach combine activities from assay. Monte Carlo uncertainty propagation used build distribution...
Imperfections in analog-to-digital conversion (ADC) cannot be ignored when signal digitization requirements demand both wide dynamic range and high resolution, as is the case for Majorana Demonstrator 76Ge neutrinoless double beta decay search. Enabling experiment's high-resolution spectral analysis efficient pulse shape discrimination required careful measurement correction of ADC nonlinearites. A simple protocol was developed that did not require sophisticated equipment or lengthy data...