A5084143047- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Nuclear physics research studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Electron Spin Resonance Studies
- Radioactive contamination and transfer
- Nuclear and radioactivity studies
- Nuclear reactor physics and engineering
- Computational Physics and Python Applications
Lawrence Berkeley National Laboratory
2019-2025
University of California, Berkeley
2019-2025
Campbell Collaboration
2023
University of California, Davis
2016-2021
SNO+ is a large liquid scintillator-based experiment located 2km underground at SNOLAB, Sudbury, Canada. It reuses the Sudbury Neutrino Observatory detector, consisting of 12m diameter acrylic vessel which will be filled with about 780 tonnes ultra-pure scintillator. Designed as multipurpose neutrino experiment, primary goal search for neutrinoless double-beta decay (0$\nu\beta\beta$) 130Te. In Phase I, detector loaded 0.3% natural tellurium, corresponding to nearly 800 kg 130Te, an expected...
Abstract New developments in liquid scintillators, high-efficiency, fast photon detectors, and chromatic sorting have opened up the possibility for building a large-scale detector that can discriminate between Cherenkov scintillation signals. Such could reconstruct particle direction species using light while also having excellent energy resolution low threshold of scintillator detector. Situated deep underground, utilizing new techniques computing reconstruction, this achieve unprecedented...
The SNO+ experiment is located 2 km underground at SNOLAB in Sudbury, Canada. A low background search for neutrinoless double beta (0νββ) decay will be conducted using 780 tonnes of liquid scintillator loaded with 3.9 natural tellurium, corresponding to 1.3 130Te. This paper provides a general overview the experiment, including detector design, construction process plants, commissioning efforts, electronics upgrades, data acquisition systems, and calibration techniques. collaboration reusing...
Hyper-Kamiokande will be a next generation underground water Cherenkov detector with total (fiducial) mass of 0.99 (0.56) million metric tons, approximately 20 (25) times larger than that Super-Kamiokande. One the main goals is study $CP$ asymmetry in lepton sector using accelerator neutrino and anti-neutrino beams. In this document, physics potential long baseline experiment beam from J-PARC proton synchrotron presented. The analysis has been updated previous Letter Intent [K. Abe et al.,...
Abstract Baryon number conservation is not guaranteed by any fundamental symmetry within the standard model, and therefore has been a subject of experimental theoretical scrutiny for decades. So far, no evidence baryon violation observed. Large underground detectors have long used both neutrino detection searches violating processes. The next generation large will seek to improve upon limits set past current experiments cover range lifetimes predicted several Grand Unified Theories. In this...
EOS is a technology demonstrator, designed to explore the capabilities of hybrid event detection technology, leveraging both Cherenkov and scintillation light simultaneously. With fiducial mass four tons, operate in high-precision regime, with sufficient size utilize time-of-flight information for full reconstruction, flexibility demonstrate range cutting edge technologies, simplicity design facilitate potential future deployment at alternative sites. Results from can inform neutrino...
The direction of individual <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mmultiscripts><a:mrow><a:mi mathvariant="normal">B</a:mi></a:mrow><a:mprescripts/><a:none/><a:mrow><a:mn>8</a:mn></a:mrow></a:mmultiscripts></a:mrow></a:math> solar neutrinos has been reconstructed using the <d:math xmlns:d="http://www.w3.org/1998/Math/MathML" display="inline"><d:mrow><d:mi>SNO</d:mi><d:mo>+</d:mo></d:mrow></d:math> liquid scintillator detector. Prompt, directional...
Abstract The SNO $$+$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mo>+</mml:mo> </mml:math> collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years data. Fitting the neutrino probability to observed energy spectrum yields constraints on mass-squared difference $$\Delta m^2_{21}$$ <mml:mrow> <mml:mi>Δ</mml:mi> <mml:msubsup> <mml:mi>m</mml:mi> <mml:mn>21</mml:mn> <mml:mn>2</mml:mn> </mml:msubsup> </mml:mrow>...
A measurement of the $^{8}\mathrm{B}$ solar neutrino flux has been made using a 69.2 kt-day dataset acquired with $\mathrm{SNO}+$ detector during its water commissioning phase. At energies above 6 MeV is an extremely pure sample elastic scattering events, owing primarily to detector's deep location, allowing accurate relatively little exposure. In that energy region best fit background rate $0.2{5}_{\ensuremath{-}0.07}^{+0.09}\text{ }\text{...
This paper reports results from a search for nucleon decay through invisible modes, where no visible energy is directly deposited during the itself, initial water phase of $\mathrm{SNO}+$. However, such decays within oxygen nucleus would produce an excited daughter that subsequently deexcite, often emitting detectable gamma rays. A rays yields limits $2.5\ifmmode\times\else\texttimes\fi{}{10}^{29}\text{ }\text{ }\mathrm{y}$ at 90% Bayesian credibility level (with prior uniform in rate)...
The SNO+ Collaboration reports the first evidence of reactor antineutrinos in a Cherenkov detector. nearest nuclear reactors are located 240 km away Ontario, Canada. This analysis uses events with energies lower than any previous large water Two analytical methods used to distinguish from background 190 days data and yield consistent for combined significance 3.5σ.
This paper reports results from a search for single and multi-nucleon disappearance the $^{16}$O nucleus in water within \snoplus{} detector using all of available data. These so-called "invisible" decays do not directly deposit energy but are instead detected through their subsequent nuclear de-excitation gamma-ray emission. New limits given partial lifetimes: $\tau(n\rightarrow inv) > 9.0\times10^{29}$ years, $\tau(p\rightarrow 9.6\times10^{29}$ $\tau(nn\rightarrow 1.5\times10^{28}$...
The $\mathrm{SNO}+$ experiment collected data as a low-threshold water Cherenkov detector from September 2017 to July 2019. Measurements of the 2.2-MeV $\ensuremath{\gamma}$'s produced by neutron capture on hydrogen were made using an Am-Be calibration source, for which large fraction emitted neutrons are simultaneously with 4.4-MeV $\ensuremath{\gamma}$. Analysis delayed coincidence between $\ensuremath{\gamma}$ and revealed detection efficiency that is centered around 50% varies at level...
SNO+ is a large-scale liquid scintillator experiment with the primary goal of searching for neutrinoless double beta decay, and located approximately 2 km underground in SNOLAB, Sudbury, Canada. The detector acquired data two years as pure water Cherenkov detector, starting May 2017. During this period, optical properties were measured situ using deployed light diffusing sphere, improving model energy response systematic uncertainties. parameters included attenuation coefficients, effective...
Proceedings for the 14th installment of Applied Antineutrino Physics (AAP) workshop series.
Abstract A liquid scintillator consisting of linear alkylbenzene as the solvent and 2,5-diphenyloxazole fluor was developed for SNO+ experiment. This mixture chosen it is compatible with acrylic has a competitive light yield to pre-existing scintillators while conferring other advantages including longer attenuation lengths, superior safety characteristics, chemical simplicity, ease handling, logistical availability. Its properties have been extensively characterized are presented here. now...
The <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mi>SNO</a:mi><a:mo>+</a:mo></a:mrow></a:math> detector operated initially as a water Cherenkov detector. implementation of sealed cover gas system midway through data taking resulted in significant reduction the activity <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"...
Water-based liquid scintillators (WbLS) are attractive neutrino detector materials because they allow us to tune the ratio of Cherenkov and scintillation signals. Using WbLS large-scale experiments can benefit from both directional reconstruction enhanced low-energy efficiency. Furthermore, broadening science capability such by metal doping may be better suited for water based scintillators. We recently constructed commissioned a 1-ton with good photosensor coverage capable data acquisition...
The SNO+ collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years data. Fitting the neutrino probability to observed energy spectrum yields constraints on mass-squared difference $\Delta m^2_{21}$. In ranges allowed by previous measurements, best-fit m^2_{21}$ is (8.85$^{+1.10}_{-1.33}$) $\times$ 10$^{-5}$ eV$^2$. This measurement continuing in next phases and expected surpass present global precision with about three years
Abstract Water-based liquid scintillators (WbLS) are a new class of detector materials that provide efficient and tunable detection both Cherenkov scintillation light. A massive WbLS neutrino with suitable photosensor coverage for low intensity light could therefore reconstruct the momentum an energetic charged particle also have enhanced low-energy sensitivity. These better suited metal doping broadening potential scientific utility. We recently constructed commissioned 1-ton good capable...
The SNO+ detector operated initially as a water Cherenkov detector. implementation of sealed covergas system midway through data taking resulted in significant reduction the activity $^{222}$Rn daughters and allowed lowest background to solar electron scattering signal above 5 MeV achieved date. This paper reports an updated phase $^8$B neutrino analysis with total livetime 282.4 days threshold 3.5 MeV. flux is found be...
The direction of individual $^8$B solar neutrinos has been reconstructed using the SNO+ liquid scintillator detector. Prompt, directional Cherenkov light was separated from slower, isotropic scintillation time information, and a maximum likelihood method used to reconstruct scattered electrons. A clear signal observed, correlated with angle. observation aided by period low primary fluor concentration that resulted in slower decay time. This is first event-by-event reconstruction high...
We present a measurement of the rate correlated neutron captures in WATCHBOY detector, deployed at depth approximately 390 meters water equivalent (m.w.e.) Kimballton Underground Research Facility (KURF). consists cylindrical 2 ton target doped with 0.1% gadolinium, surrounded by 40 undoped hermetic shield. comparison our results expected arising from high-energy neutrons incident on outside shield, predicted hybrid FLUKA/GEANT4-based simulation. The energy distribution used simulation was...