A5018961026- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Neutrino Physics Research
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Particle Detector Development and Performance
- Atomic and Molecular Physics
- Radioactivity and Radon Measurements
- Astrophysics and Cosmic Phenomena
- Ion-surface interactions and analysis
- Laser-induced spectroscopy and plasma
- Nuclear Materials and Properties
- Graphite, nuclear technology, radiation studies
- Atmospheric Ozone and Climate
- Astronomical and nuclear sciences
- Radioactive contamination and transfer
- Quantum, superfluid, helium dynamics
- Quantum Chromodynamics and Particle Interactions
- Advanced Data Storage Technologies
- CCD and CMOS Imaging Sensors
- Astro and Planetary Science
- Laser-Plasma Interactions and Diagnostics
University of Alabama
2018-2023
Institute of Microelectronics
2021
Chinese Academy of Sciences
2020-2021
Institute of High Energy Physics
2020
University of Massachusetts Amherst
2019
Argonne National Laboratory
2013-2018
GSI Helmholtz Centre for Heavy Ion Research
2010-2014
Al-Balqa Applied University
2010-2011
A search for neutrinoless double-beta decay ($0\nu\beta\beta$) in $^{136}$Xe is performed with the full EXO-200 dataset using a deep neural network to discriminate between $0\nu\beta\beta$ and background events. Relative previous analyses, signal detection efficiency has been raised from 80.8% 96.4$\pm$3.0% energy resolution of detector at Q-value improved $\sigma/E=1.23\%$ $1.15\pm0.02\%$ upgraded detector. Accounting new data, median 90% confidence level half-life sensitivity this analysis...
Abstract The nEXO neutrinoless double beta (0 νββ ) decay experiment is designed to use a time projection chamber and 5000 kg of isotopically enriched liquid xenon search for the in 136 Xe. Progress detector design, paired with higher fidelity its simulation an advanced data analysis, based on one used final results EXO-200, produce sensitivity prediction that exceeds half-life 10 28 years. Specifically, improvements have been made understanding production scintillation photons charge as...
The interaction between neutron-rich nuclei plays an important role for understanding the reaction mechanism of fusion process as well energy production through pycnonuclear reactions in crust neutron stars. We have performed first measurements total cross sections systems (10,14,15)C+(12)C using a new active target-detector system. In region accessible with existing radioactive beams, good agreement experimental and theoretical is observed. This gives confidence our ability to calculate...
Future tonne-scale liquefied noble gas detectors depend on efficient light detection in the VUV range. In past years Silicon Photomultipliers (SiPMs) have emerged as a valid alternative to standard photomultiplier tubes or large area avalanche photodiodes. The next generation double beta decay experiment, nEXO, with 5 tonne liquid xenon time projection chamber, will use SiPMs for detecting $178\,\text{nm}$ scintillation light, order achieve an energy resolution of $\sigma / Q_{\beta\beta} =...
Liquid xenon (LXe) is employed in a number of current and future detectors for rare event searches. We use the EXO-200 experimental data to measure absolute scintillation ionization yields generated by $\ensuremath{\gamma}$ interactions from $^{228}\mathrm{Th}$ (2615 keV), $^{226}\mathrm{Ra}$ (1764 $^{60}\mathrm{Co}$ (1332 keV 1173 keV) calibration sources, over range electric fields. The $W$ value that defines recombination-independent energy scale measured be...
We present a search for electron-recoil signatures from the charged-current absorption of fermionic dark matter using EXO-200 detector. report an average background rate $6.8\ifmmode\times\else\texttimes\fi{}{10}^{4}\text{ }\text{ }\mathrm{cts}\text{ }{\mathrm{kg}}^{\ensuremath{-}1}\text{ }{\mathrm{yr}}^{\ensuremath{-}1}\text{ }{\mathrm{keV}}^{\ensuremath{-}1}$ above 4 MeV and find no statistically significant excess over our projection. Using total $^{136}\mathrm{Xe}$ exposure 234.1 kg yr,...
A search for Majoron-emitting modes of the neutrinoless double-beta decay $^{136}$Xe is performed with full EXO-200 dataset. This dataset consists a total exposure 234.1 kg$\cdot$yr, and includes data detector upgrades that have improved energy threshold relative to previous searches. lower limit T$_{1/2}^{\rm{^{136}Xe}}>$4.3$\cdot$10$^{24}$ yr at 90\% C.L. on half-life spectral index $n=1$ Majoron was obtained, factor 3.6 more stringent than from EXO-200, corresponding constraint...
The existence of ^{26}Al (t_{1/2}=7.17×10^{5} yr) in the interstellar medium provides a direct confirmation ongoing nucleosynthesis Galaxy. presence low-lying 0^{+} isomer (^{26}Al^{m}), however, severely complicates astrophysical calculations. We present for first time study ^{26}Al^{m}(d,p)^{27}Al reaction using an isomeric beam. selectivity this allowed ℓ=0 transfers to T=1/2, and T=3/2 states ^{27}Al. Mirror symmetry arguments were then used constrain ^{26}Al^{m}(p,γ)^{27}Si rate provide...
The $^{23}$Na$(\alpha,p)^{26}$Mg and $^{23}$Na$(\alpha,n)^{26}$Al reactions are important for our understanding of the $^{26}$Al abundance in massive stars. aim this work is to report on a direct simultaneous measurement these astrophysically using an active target system. were investigated inverse kinematics $^{4}$He as gas detector. We measured excitation functions energy range about 2 6 MeV center mass. have found that cross sections good agreement with previous experiments, statistical...
Understanding reflective properties of materials and photodetection efficiency (PDE) photodetectors is important for optimizing energy resolution sensitivity the next generation neutrinoless double beta decay, direct detection dark matter, neutrino oscillation experiments that will use noble liquid gases, such as nEXO, DARWIN, DarkSide-20k, DUNE . Little information currently available about reflectivity PDE in because measurements are difficult to conduct a cryogenic environment at short...
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...
Generative Adversarial Networks trained on samples of simulated or actual events have been proposed as a way generating large datasets at reduced computational cost. In this work, novel approach to perform the simulation photodetector signals from time projection chamber EXO-200 experiment is demonstrated. The method based Wasserstein Network - deep learning technique allowing for implicit non-parametric estimation population distribution given set objects. Our network real calibration data...
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...
Using an array of high-purity Compton-suppressed germanium detectors, we performed independent measurement the $\beta$-decay branching ratio from $^{12}\mathrm{B}$ to second-excited (Hoyle) state in $^{12}\mathrm{C}$. Our result is $0.64(11)\%$, which a factor $\sim 2$ smaller than previously established literature value, but agreement with another recent measurement. This could indicate that Hoyle more clustered believed. The angular correlation $\gamma$ cascade has also been measured for...
We report on a comparison between the theoretically predicted and experimentally measured spectra of first-forbidden nonunique β-decay transition 137Xe(7/2−)→137Cs(7/2+). The experimental data were acquired by EXO-200 experiment during deployment an AmBe neutron source. ultralow background environment EXO-200, together with dedicated source analysis procedures, allowed for collection pure sample decays, estimated signal to ratio more than 99 1 in energy range from 1075 4175 keV. In addition...
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...