G.S. Ortega
A5071157490- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Radiation Detection and Scintillator Technologies
- Particle physics theoretical and experimental studies
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Atmospheric Ozone and Climate
- Photocathodes and Microchannel Plates
- Radioactivity and Radon Measurements
- Radioactive contamination and transfer
- CCD and CMOS Imaging Sensors
Pacific Northwest National Laboratory
2018-2024
Washington State University
2021
University of Nariño
2019
The next-generation Enriched Xenon Observatory (nEXO) is a proposed experiment to search for neutrinoless double beta ($0\nu\beta\beta$) decay in $^{136}$Xe with target half-life sensitivity of approximately $10^{28}$ years using $5\times10^3$ kg isotopically enriched liquid-xenon time projection chamber. This improvement two orders magnitude over current limits obtained by significant increase the mass, monolithic and homogeneous configuration active medium, multi-parameter measurements...
Characterization of the vacuum ultraviolet (VUV) reflectance silicon photomultipliers (SiPMs) is important for large-scale SiPM-based photodetector systems. We report angular dependence specular in a SiPMs manufactured by Fondazionc Bruno Kessler (FBK) and Hamamatsu Photonics K.K. (HPK) over wavelengths ranging from 120 nm to 280 nm. Refractive index extinction coefficient thin silicon-dioxide film deposited on surface FBK are derived data wafer with same oxide as SiPMs. The diffuse also...
Neutrinoless double beta decay is one of the most sensitive probes for new physics beyond Standard Model particle physics. One isotopes under investigation <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Xe</a:mi><a:mprescripts/><a:none/><a:mn>136</a:mn></a:mmultiscripts></a:math>, which would into <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Ba</b:mi><b:mprescripts/><b:none/><b:mn>136</b:mn></b:mmultiscripts></b:math>. Detecting...
Abstract Muon tomography is a technique based on the observation of absorption muons in matter, as ordinary radiography does using X-rays. The interaction cosmic rays with atmosphere produce Extensive Air Showers, which provide an abundant source muons. These particles can be used for multiple applications muon tomography, particular, to study internal structure different volcanoes edifices. It necessary any experiment particle detector that has capability sensitive interactions. Here we...
nEXO is a proposed experiment to search for the neutrino-less double beta decay (0νββ) of 136Xe in tonne-scale liquid xenon time projection chamber (TPC) . The TPC will be equipped with charge collection tiles form anode. In this work, reconstruction performance anode design studied dedicated simulation package. A multi-variate method and deep neural network are developed distinguish simulated 0νββ signals from backgrounds arising trace levels natural radioactivity detector materials. These...
A new design for the anode of a time projection chamber, consisting charge-detecting "tile", is investigated use in large scale liquid xenon detectors. The tile produced by depositing 60 orthogonal metal charge-collecting strips, 3 mm wide, on 10 cm × fused-silica wafer. These charge tiles may be employed detectors, such as proposed tonne-scale nEXO experiment to search neutrinoless double-beta decay. Modular design, an array can cover sizable area. width each strip small compared size tile,...
Silicon photomultipliers are regarded as a very promising technology for next-generation, cutting-edge detectors low-background experiments in particle physics. This work presents systematic reflectivity studies of Photomultipliers (SiPM) and other samples liquid xenon at vacuum ultraviolet (VUV) wavelengths. A dedicated setup the University Münster has been used that allows to acquire angle-resolved reflection measurements various immersed with 0.45° angular resolution. Four investigated...
The search for neutrinoless double beta decay probes the fundamental properties of neutrinos, including whether or not neutrino and antineutrino are distinct. Double detectors large expensive, so background reduction is essential extracting highest sensitivity. identification, 'tagging', $^{136}$Ba daughter atom from $^{136}$Xe provides a technique eliminating backgrounds in nEXO experiment. tagging scheme studied this work utilizes cryogenic probe to trap barium solid xenon, where tagged...
Electron-neutrino charged-current interactions with xenon nuclei were modeled in the nEXO neutrinoless double-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>β</a:mi></a:math> decay detector (<c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mo>∼</c:mo><c:mn>5</c:mn></c:math> metric ton, 90% <e:math xmlns:e="http://www.w3.org/1998/Math/MathML"...
We report the first precision measurement of superheat temperature required for bubble nucleation in liquid xenon $\Delta T_{wall,ONB}$ = (16.9$\pm$0.5) K and (19.2$^{+0.4}_{-1.1}$) at pressures P $(0.98\pm0.02)$ bar $(1.32^{+0.05}_{-0.01})$ bar, respectively. Both are measured a subcooled bulk fluid $\sim$ 162 K. A dedicated setup is used to measure which appears on flat surface resistor. The associated average heat flux resistor determined using dynamics simulations. Future experiments can...
Abstract We study a possible calibration technique for the nEXO experiment using 127 Xe electron capture source. is next-generation search neutrinoless double beta decay (0 νββ ) that will use 5-tonne, monolithic liquid xenon time projection chamber (TPC). The xenon, used both as source and detection medium, be enriched to 90% in 136 Xe. To optimize event reconstruction energy resolution, calibrations are needed map position- time-dependent detector response. 36.3 day half-life of its small...