A.B. McDonald
A5009120419- Neutrino Physics Research
- Astrophysics and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Dark Matter and Cosmic Phenomena
- COVID-19 diagnosis using AI
- Respiratory Support and Mechanisms
- Intensive Care Unit Cognitive Disorders
- Radiation Therapy and Dosimetry
- Particle Detector Development and Performance
- International Science and Diplomacy
- Radiation Detection and Scintillator Technologies
- Cosmology and Gravitation Theories
- Dermatological and COVID-19 studies
- Digital Games and Media
- Cardiac Arrest and Resuscitation
- Spacecraft and Cryogenic Technologies
- Atomic and Subatomic Physics Research
- Cultural Industries and Urban Development
- X-ray Spectroscopy and Fluorescence Analysis
- Superconducting Materials and Applications
- Inorganic Fluorides and Related Compounds
- Facial Nerve Paralysis Treatment and Research
- Photocathodes and Microchannel Plates
Queen's University
2009-2024
We report results from a combined analysis of solar neutrino data all phases the Sudbury Neutrino Observatory (SNO). By exploiting particle identification information obtained proportional counters installed during third phase, this improved background rejection in that phase experiment. The SNO resulted total flux active flavors ${}^{8}\mathrm{B}$ decays Sun...
Results are reported from a joint analysis of Phase I and II data the Sudbury Neutrino Observatory. The effective electron kinetic energy threshold used is ${T}_{\mathrm{eff}}=3.5$ MeV, lowest yet achieved with water Cherenkov detector data. In units ${10}^{6}$ cm${}^{\ensuremath{-}2}$ ${\mathrm{s}}^{\ensuremath{-}1}$, total flux active-flavor neutrinos $^{8}\mathrm{B}$ decay in Sun measured using neutral current (NC) reaction on deuterons, no constraint neutrino spectrum, found to be...
This review paper provides a summary of the published results Sudbury Neutrino Observatory (SNO) experiment that was carried out by an international scientific collaboration with data collected during period from 1999 to 2006. By using heavy water as detection medium, SNO demonstrated clearly solar electron neutrinos $^8$B decay in core change into other active neutrino flavors transit Earth. The reaction on deuterium has equal sensitivity all also very accurate measure initial flux for...
We present here the design of Mechanical Ventilator Milano (MVM), a novel mechanical ventilator designed for mass scale production in response to COVID-19 pandemics, compensate dramatic shortage such ventilators many countries. This is an electro-mechanical equivalent old, reliable Manley Ventilator. Our optimized permit large sale short time and at limited cost, relying on off-the-shelf components, readily available worldwide from hardware suppliers. Operation MVM requires only source...
Neutrinoless double-beta decay searches play a major role in determining the nature of neutrinos, existence lepton violating process, and effective Majorana neutrino mass. The Collaboration proposes to assemble an array HPGe detectors search for neutrinoless Ge-76. Our proposed method uses well-established technique searching high purity Ge-diode radiation that both roles source detector. is augmented with recent improvements signal processing detector design, advances controlling intrinsic...
Building a Ovββ experiment with the ability to probe neutrino mass in inverted hierarchy region requires combination of large detector sensitive Ovββ, on order 1-tonne, and unprecedented background levels, or less than 1 count per year Ovβ β signal region. The MAJORANA Collaboration proposes design based using high-purity enriched 76Ge crystals deployed ultralow electroformed Cu cryostats modern analysis techniques that should be capable reaching required sensitivity while also being...
Liquid argon has very desirable timing characteristics for the detection of interactions Weakly Interacting Massive Particles (WIMPs) as Dark Matter candidates. Nuclear recoil emit light with time constants order nanoseconds, whereas gammas and betas have microseconds, enabling discrimination such backgrounds by factors greater than 108. The global community using liquid WIMPs includes a series experiments ranging from Dark-Side-50, ArDM, DEAP-3600, DarkSide-20k in future ARGO detector...
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...
In the field of particle astrophysics, scientists are trying to understand how universe started and it works at a very basic level. Using particles from astrophysics sources, we study laws physics smallest possible scale matter develop mathematical formulas that describe elementary interact with each other make up our universe. My colleagues I have been studying neutrinos—one fundamental building blocks That helps us has evolved since began Big Bang some 13.8 billion years ago. this article,...
With the passing of John N. Bahcall in August, 2005, our field has lost a pioneer, innovator, mentor and friend. made many contributions to fields astrophysics neutrino physics. In this memorial, I will primarily trace John's physics solar indicate ways that he displayed strong leadership during his extraordinary scientific career.