B. Jamieson
A5025737896- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Particle Detector Development and Performance
- Particle accelerators and beam dynamics
- Electron and X-Ray Spectroscopy Techniques
- Nuclear physics research studies
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Muon and positron interactions and applications
- Nuclear reactor physics and engineering
- Korean Peninsula Historical and Political Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Catalysis and Oxidation Reactions
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Noncommutative and Quantum Gravity Theories
- Radioactive Decay and Measurement Techniques
Institute for Cosmic Ray Research
2024
University of Winnipeg
2012-2024
The University of Tokyo
2023-2024
TRIUMF
2005-2023
Campbell Collaboration
2008-2022
University of British Columbia
2009-2020
University of Manitoba
2017-2019
Institute of Particle Physics
2013
University of Alberta
2009-2013
University of California, Irvine
2013
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...
The Sudbury Neutrino Observatory (SNO) used an array of 3He proportional counters to measure the rate neutral-current interactions in heavy water and precisely determined total active (nu_x) 8B solar neutrino flux. This technique is independent previous methods employed by SNO. flux found be 5.54_-0.31;+0.33(stat)-0.34+0.36(syst)x10(6) cm(-2) s(-1), agreement with measurements standard models. A global analysis reactor results yields Deltam2=7.59_-0.21;+0.19x10(-5) eV2 theta=34.4_-1.2;+1.3...
This article provides the complete description of results from Phase I data set Sudbury Neutrino Observatory (SNO). The is based on a 0.65 kiloton-year exposure ${}^{2}{\mathrm{H}}_{2}$O (in following denoted as ${\mathrm{D}}_{2}$O) to solar $^{8}\mathrm{B}$ neutrino flux. Included here are details SNO physics and detector model, evaluations systematic uncertainties, estimates backgrounds. Also discussed SNO's approach statistical extraction signals three reactions (charged current, neutral...
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.,...
This paper details the solar neutrino analysis of 385.17-day Phase-III data set acquired by Sudbury Neutrino Observatory (SNO). An array $^3$He proportional counters was installed in heavy-water target to measure precisely rate neutrino-deuteron neutral-current interactions. technique determine total active $^8$B flux largely independent methods employed previous phases. The neutrinos measured be $5.54^{+0.33}_{-0.31}(stat.)^{+0.36}_{-0.34}(syst.)\times 10^{6}$ cm$^{-2}$ s$^{-1}$, consistent...
Neutron-antineutron oscillations in nature would violate baryon number and indicate a potential underlying mechanism for the observed matter-antimatter asymmetry. Sudbury Neutrino Observatory reports limits on neutron-antineutron first time deuteron. These establish important constraints beyond-the-Standard-Model scenarios that involve baryon-number violation.
The long baseline between Earth and the Sun makes solar neutrinos an excellent test beam for exploring possible neutrino decay. signature of such decay would be energy-dependent distortion traditional survival probability which can fit using well-developed high-precision analysis methods. Here a model including is to all three phases 8B data taken by Sudbury Neutrino Observatory (SNO). This constrains lifetime mass state ν2 >8.08×10−5 s/eV at 90% confidence. An combining this SNO result with...
Results are reported on the measurement of atmospheric neutrino-induced muon flux at a depth 2 kilometers below Earth's surface from 1229 days operation Sudbury Neutrino Observatory (SNO). By measuring through-going muons as function zenith angle, SNO experiment can distinguish between oscillated and unoscillated portion neutrino flux. A total 514 muonlike events measured $\ensuremath{-}1\ensuremath{\le}\mathrm{cos}{\ensuremath{\theta}}_{\mathrm{zenith}}\ensuremath{\le}0.4$ in exposure...
We installed a source for ultracold neutrons at new, dedicated spallation target TRIUMF. The was originally developed in Japan and uses superfluid-helium converter cooled to 0.9$\,$K. During an extensive test campaign November 2017, we extracted up 325000 after one-minute irradiation of the target, over three times more than previously achieved with this source. corresponding ultracold-neutron density whole production guide volume is 5.3$\,$cm$^{-3}$. storage lifetime initially 37$\,$s...
The TWIST Collaboration has measured the Michel parameter rho in normal muon decay, mu(+)--> e(+)nu(e)nu (mu). In standard model, = 3/4. Deviations from this value imply mixing of left- and right-handed electron couplings. We find rho=0.750 80+/-0.000 32(stat) +/- 0.000 97(syst) 23, where last uncertainty represents dependence on eta. This result sets new limits W(L)-W(R) angle left-right symmetric models.
The muon decay parameter delta has been measured by the TWIST collaboration. We find = 0.74964 +- 0.00066(stat.) 0.00112(syst.), consistent with Standard Model value of 3/4. This result implies that product Pmuxi polarization in pion decay, Pmu, and xi falls within 90% confidence interval 0.9960 < 1.0040. It also implications for left-right-symmetric other extensions Model.
Experimental tests of Lorentz symmetry in systems all types are critical for ensuring that the basic assumptions physics well founded. Data from phases Sudbury Neutrino Observatory, a kiloton-scale heavy water Cherenkov detector, analyzed possible violations neutrino sector. Such would appear as one eight signal detector: six seasonal variations solar electron survival probability differing energy and time dependence two shape changes to oscillated spectrum. No evidence such signals is...
We have performed three searches for high-frequency signals in the solar neutrino flux measured by Sudbury Neutrino Observatory (SNO), motivated possibility that $g$-mode oscillations could affect production or propagation of $^8$B neutrinos. The first search looked any significant peak frequency range 1/day to 144/day, with a sensitivity sinusoidal amplitudes 12% greater. second focused on regions which been claimed experiments aboard SoHO satellite, and was sensitive 10% third extra power...
A search has been performed for neutrinos from two sources, the $hep$ reaction in solar $pp$ fusion chain and $\nu_e$ component of diffuse supernova neutrino background (DSNB), using full dataset Sudbury Neutrino Observatory with a total exposure 2.47 kton-years after fiducialization. The is both single-bin counting analysis likelihood fit. We find best-fit flux that compatible model predictions while remaining consistent zero flux, set one-sided upper limit $\Phi_{hep} <...
The TWIST Collaboration has performed new measurements of two the parameters that describe muon decay: $\ensuremath{\rho}$, which governs shape overall momentum spectrum, and $\ensuremath{\delta}$, dependence parity-violating decay asymmetry. This analysis gives results $\ensuremath{\rho}=0.750\text{ }14\ifmmode\pm\else\textpm\fi{}0.000\text{ }17(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.000\text{ }44(\mathrm{syst})\ifmmode\pm\else\textpm\fi{}0.000\text{ }11(\ensuremath{\eta})$, where last...
Results are reported from a search for low-multiplicity neutrino bursts in the Sudbury Neutrino Observatory (SNO). Such could indicate detection of nearby core-collapse supernova explosion. The data were taken Phase I (November 1999 - May 2001), when detector was filled with heavy water, and II (July 2001 August 2003), NaCl added to target. blind analysis which potential backgrounds estimated cuts developed eliminate such 90% confidence before examined. maintained greater than 50%...
The quantity P_{mu}^{pi}xi, where xi is one of the muon decay parameters and $P_{\mu}^{\pi}$ degree polarization in pion decay, has been measured. value P_{mu}^{pi}xi = 1.0003 +- 0.0006 stat. 0.0038 syst. was obtained. This result agrees with previous measurements but over a factor two more precise. It also Standard Model prediction for thus leads to restrictions on left-right symmetric models.
Water Cherenkov detectors like Super-Kamiokande, and the next generation Hyper-Kamiokande are adding gadolinium to their water improve detection of neutrons. By detecting neutrons in addition leptons neutrino interactions, an improved separation between anti-neutrinos, reduced backgrounds for proton decay searches can be expected. The neutron signal itself is still small confused with muon spallation other background sources. In this paper, machine learning techniques employed optimize...
Differential cross sections for π−p and π+p elastic scattering were measured at five energies between 19.9 43.3 MeV. The use of the CHAOS magnetic spectrometer TRIUMF, supplemented by a range telescope muon background suppression, provided simultaneous coverage large part full angular range, thus allowing very precise relative section measurements. absolute normalisation was determined with typical accuracy 5%. This verified in measurement proton scattering. show some deviations from phase...