G. Gallina
A5037919995- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Neutrino Physics Research
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Advanced Optical Sensing Technologies
- Particle physics theoretical and experimental studies
- Plasma Diagnostics and Applications
- Atmospheric Ozone and Climate
- Analytical Chemistry and Sensors
- Particle accelerators and beam dynamics
- Magnetic confinement fusion research
- Advanced Semiconductor Detectors and Materials
- Photocathodes and Microchannel Plates
- Spacecraft and Cryogenic Technologies
- Superconducting Materials and Applications
- Advanced X-ray and CT Imaging
- Advanced Fiber Laser Technologies
- Spectroscopy and Laser Applications
- Nuclear Physics and Applications
- Astrophysics and Cosmic Phenomena
- Radioactive contamination and transfer
- Aerosol Filtration and Electrostatic Precipitation
- Ocular and Laser Science Research
- Calibration and Measurement Techniques
Princeton University
2022-2025
TRIUMF
2018-2023
University of British Columbia
2019-2022
Institute of High Energy Physics
2020-2021
Chinese Academy of Sciences
2020-2021
University of Padua
2016
This paper introduces the neutrinoless double-beta decay (the rarest nuclear weak process) and describes status of research for this transition, both from point view theoretical physics in terms present future experimental scenarios. Implications phenomenon on crucial aspects particle are briefly discussed. The calculations matrix elements case mass mechanisms reviewed, a range these quantities is proposed most appealing candidates. After introducing general concepts—such as choice best...
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 projected performance and detector configuration of nEXO are described in this pre-Conceptual Design Report (pCDR). is a tonne-scale neutrinoless double beta ($0νββ$) decay search $^{136}$Xe, based on the ultra-low background liquid xenon technology validated by EXO-200. With $\simeq$ 5000 kg enriched to 90% isotope 136, has half-life sensitivity approximately $10^{28}$ years. This represents an improvement about two orders magnitude with respect current results. Based experience gained...
Dark matter lighter than 10 GeV/c$^2$ encompasses a promising range of candidates. A conceptual design for new detector, DarkSide-LowMass, is presented, based on the DarkSide-50 detector and progress toward DarkSide-20k, optimized low-threshold electron-counting measurement. Sensitivity to light dark explored various potential energy thresholds background rates. These studies show that DarkSide-LowMass can achieve sensitivity down solar neutrino floor GeV-scale masses significant MeV/c$^2$...
Abstract DarkSide-20k (DS-20k) is a dark matter detection experiment under construction at the Laboratori Nazionali del Gran Sasso (LNGS) in Italy. It utilises ∼ 100 t of low radioactivity argon from an underground source (UAr) its inner detector, with half serving as target dual-phase time projection chamber (TPC). The UAr cryogenics system must maintain stable thermodynamic conditions throughout experiment's lifetime over 10 years. Continuous removal impurities and radon essential for...
Presents corrections to the paper, Corrections "Stimulated Secondary Emission of Single-Photon Avalanche Diodes".
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 $\sigma / Q_{\beta\beta} =...
Context. When exploring the stability of multiplanet systems in binaries, two parameters are normally exploited: critical semimajor axis ac computed by Holman & Wiegert (1999, AJ, 117, 621) within which planets stable against binary perturbations, and Hill limit Δ determining minimum separation beyond will avoid mutual close encounters. Both these derived different contexts, i.e. is usually adopted for computing around a single star while planet system.
Abstract The direct search for dark matter in the form of weakly interacting massive particles (WIMP) is performed by detecting nuclear recoils produced a target material from WIMP elastic scattering. experimental identification direction WIMP-induced crucial asset this field, as it enables unmistakable modulation signatures matter. Recoil Directionality (ReD) experiment was designed to probe such directional sensitivity argon dual-phase time projection chambers (TPC), that are widely...
Understanding reflective properties of materials and photodetection efficiency (PDE) photodetectors is important for optimizing energy resolution sensitivity the next generation neutrinoless double beta decay, direct detection dark matter, neutrino oscillation experiments that will use noble liquid gases, such as nEXO, DARWIN, DarkSide-20k, DUNE . Little information currently available about reflectivity PDE in because measurements are difficult to conduct a cryogenic environment at short...
Liquid xenon time projection chambers are promising detectors to search for neutrinoless double beta decay (0$\nu \beta \beta$), due their response uniformity, monolithic sensitive volume, scalability large target masses, and suitability extremely low background operations. The nEXO collaboration has designed a tonne-scale chamber that aims 0$\nu \beta$ of \ce{^{136}Xe} with projected half-life sensitivity $1.35\times 10^{28}$~yr. To reach this sensitivity, the design goal is $\leq$1\%...
EDI (enhanced biDimensional pIc) is a two-dimensional (2-D) electrostatic/magnetostatic particle-in-cell (PIC) code designed to optimize plasma based systems. The built on an unstructured mesh of triangles, allowing for arbitrary geometries. PIC core comprised Boris leapfrog scheme that can manage multiple species. Particle tracking locates particles in the mesh, using fast and simple priority-sorting algorithm. A magnetic field with topology be imposed study magnetized particle dynamics....
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...
Silicon Photo-Multipliers (SiPMs) are detectors sensitive to single photons that used detect scintillation and Cherenkov light in a variety of physics medical-imaging applications. SiPMs measure by amplifying the photo-generated carriers (electrons or holes) via Geiger-mode avalanche. The Photon Detection Efficiency (PDE) is combined probability photon absorbed active volume device with subsequently triggered Absorption avalanche triggering probabilities correlated since latter depends on...
In this paper, we report on the photon emission of Silicon Photomultipliers (SiPMs) from avalanche pulses generated in dark conditions, with main objective better understanding associated systematics for next-generation, large area, SiPM-based physics experiments. A new apparatus spectral and imaging analysis was developed at TRIUMF used to measure light emitted by two SiPMs considered as photo-sensor candidates nEXO neutrinoless double-beta decay experiment: one Fondazione Bruno Kessler...
The search for neutrinoless double beta decay is the only practical way to test whether neutrinos are Majorana or Dirac particles. next generation of experiments aim probe effective neutrino mass down few 10 meV, as predicted by oscillation in case inverse hierarchy. According recent nuclear matrix calculations, rates per isotope varying within a factor when comparing them same theoretical model framework. sensitivity upcoming depend therefore primarily on available isotopes and experimental...
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...
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...
We report on the performance of silicon photomultiplier (SiPM) light sensors operating in electric field strength up to 30 kV/cm and at a temperature 149 K, relative their absence an external field. The SiPM devices used this study show stable gain, photon detection efficiency, rates correlated pulses, when exposed fields, within estimated uncertainties. No visible damage surface was caused by exposure.