Associate Professor of
University of British Columbia
Office: Hennings 342
Wednesday 10:00-11:00, Thursday 9:30-10:30
Department of Physics, University of Chicago
Washington University. Double major in physics
My research interests span a broad range of experimental high energy physics and particle astrophysics. My primary research is in the field of neutrino oscillations. I am the national spokesperson of the Canadian effort on the T2K neutrino oscillation experiment, which is trying to measure the neutrino mixing angle q13 by looking for evidence of electron neutrinos appearing in a beam of muon neutrinos. I am co-convener of T2K's near detector group, consisting of over half of the collaboration. I also led the effort to build Fine-Grained Detectors (FGDs) for T2K, which are finely segmented active neutrino targets using polystyrene scintillator, passive water target layers, and Multi-Pixel Photon Counters with wavelength-shifting fibers for read-out. Previously I served as convener of T2K's near detector muon neutrino analysis group and as chair of T2K's Publication Board.
Since July 2000 I have worked on the Sudbury Neutrino Observatory (SNO), which is a solar neutrino experiment designed to measure both the total flux of neutrinos from the Sun and the flux of electron neutrinos. SNO was the first experiment to directly measure the flavor content of the solar neutrino flux, and to demonstrate conclusively that solar neutrinos undergo flavor transformation, pointing to a final resolution of the long-standing solar neutrino problem. The SNO experiment ended in 2006, and is currently writing up its final publications.
My work on SNO has concentrated on a number of central analysis issues:
signal extraction techniques (I led SNO's signal extraction working group for the pure D2O phase of the experiment and my group took on this work for the NCD phase of the experiment.)
systematic uncertainty estimation and calculation, and statistical techniques
day-night analyses and systematic uncertainties (I chaired SNO's day-night analysis working group)
energy spectra measurements
time variability/periodicity measurements
I was also involved with the K2K experiments. K2K was the first long baseline neutrino oscillation experiment, and concluded data-taking in the fall of 2004. It was designed to look for for neutrino oscillations in a muon neutrino beam sent from the KEK laboratory towards the Super-Kamiokande detector. K2K found evidence for neutrino oscillations in a terrestrial muon neutrino beam at a significance of 4 sigma.
As a graduate student I worked in the area of gamma-ray astrophysics with the STACEE experiment. STACEE is a novel ground-based atmospheric Cherenkov telescope built using the steerable mirrors at a solar power test facility. My Ph.D. thesis was the first ground-based measurement of the Crab Nebula's flux and search for pulsed emission from the Crab's pulsar below 200 GeV.
I am currently starting to get involved in direct dark matter searches at SNOLAB using cryogenic detectors with the SuperCDMS collaboration..
In the fall of 2011 I taught Physics 509, a graduate-level course in statistical data analysis for the physical sciences, although I probably won't teach it again for a few years. In the spring of 2012 I taught Physics 101, which is just what it sounds like. In fall 2012 I will teach graduate-level classical electrodynamics (Physics 504).
Sloan Research Fellowship, 2008
Teaching Excellence Award, UBC Science Undergraduate Society, 2007
NSERC John C. Polanyi Award, 2006
Canada Research Chair in Origins, 2004-present
National Science Foundation Graduate Fellowship, 1994.
Phi Beta Kappa, 1993
Some Talks I've Given:
The Unbearable Lightness of Being (A Neutrino): a talk on neutrinos suitable for the general public
Blind Analyses, or The Answer's Not In the Back of the Book: a colloquium-level talk on blind analyses
Lake Louise Winter Institute 2006:
Lecture 1: Neutrino Physics Part 1: Neutrinos in the Standard Model, and Why the Standard Model is Wrong
Lecture 2: Neutrino Physics Part 2: Beyond the Nu Standard Model
Selected Publications (You may also click the following link to search INSPIRES for more of my publications.):
First Muon-Neutrino Disappearance Study with an Off-Axis Beam, K. Abe t al., Phys. Rev. D. 85, 031103, 2012.
Combined Analysis of all Three Phases of Solar Neutrino Data from the Sudbury Neutrino Observatory, B. Aharmin et al, submitted to Phys. Rev. C, 2011.
Indication of Electron Neutrino Appearance from an Accelerator-produced Off-axis Muon Neutrino Beam, K. Abe et al., PRL 107, 104801, 2011.
Characterization and Simulation of the Response of Multi Pixel Photon Counters to Low Light Levels, A. Varechet et al., NIM A 656, 69-83, 2011.
Low Multiplicity Burst Search at the Sudbury Neutrino Observatory, Astrophys. J. 728, 83, 2011.
Low Energy Threshold Analysis of the Phase I and Phase II Data Sets of the Sudbury Neutrino Observatory, B. Aharmin et al., Phys. Rev C 81, 055504, 2010.
Searches for High Frequency Variations in the 8B Solar Neutrino Flux at the Sudbury Neutrino Observatory, B. Aharmin et al., Astrophys.J.710:540-548,2010.
An Independent Measurement of the Total Active B-8 Solar Neutrino Flux Using an Array of He-3 Proportional Counters at the Sudbury Neutrino Observatory, B. Aharmin et al., Phys.Rev.Lett.101:111301, 2008.
Measurement of Neutrino Oscillation by the K2K Experiment, M.H. Ahn et al., Phys. Rev. D 74, 072003, 2006.
A Search for Neutrinos from the Solar hep Reaction and the Diffuse Supernova Neutrino Background with the Sudbury Neutrino Observatory, B. Aharmin et al., Ap.J. 653, 1545, 2006.
Measurement of the quasi-elastic axial vector mass in neutrino-oxygen interactions, R. Grant et al., Phys. Rev. D 74, 052002, 2006.
An Improved Search For nu_mu to nu_e Oscillation In A Long-Baseline Accelerator Experiment, S. Yamamoto et al., Phys. Rev. Lett. 96, 181801, 2006.
A Search For Periodicities in the 8B Solar Neutrino Flux Measured By the Sudbury Neutrino Observatory, B. Aharmin et al., Phys. Rev. D72 (2005), 052010.
Coherent Charged Pion Production In Neutrino-Carbon Interactions,
M. Hasegawa et al., Phys. Rev. Lett 95 (2005) 252301.
Electron Energy Spectra, Fluxes, and Day-Night Asymmetries of 8B Solar Neutrinos from Measurements with NaCl Dissolved in the Heavy-Water Detector at the Sudbury Neutrino Observatory, B. Aharmim et al., Phys. Rev. C72 (2005), 055502.
Evidence for muon
neutrino oscillation in an accelerator-based experiment, E. Aliu
et al, (Phys. Rev. Lett. 94 (2005), 081802).
Electron Antineutrino Search at the Sudbury Neutrino Observatory, B. Aharmin et al, submitted to Phys. Rev. D, 2004
Constraints on Nucleon Decay via ``Invisible'' Modes from the Sudbury Neutrino Observatory, S.N. Ahmed et al, (Phys. Rev. Lett. 92 (2004) 102004)
Measurement of the Total Active 8B Solar Neutrino Flux at the Sudbury Neutrino Observatory with Enhanced Neutral Current Sensitivity, S.N. Ahmed et al. (Phys. Rev. Lett. 92 (2004) 181301)
Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory (Phys. Rev. Lett. 89 (2002) 011301)
Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters (Phys. Rev. Lett. 89 (2002) 011302)
Measurement of the rate of nu_e + d --> p + p + e- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory (Phys.Rev.Lett. 87 (2001) 071301)
High Energy Gamma-Ray Observations of the Crab Nebula and Pulsar with the Solar Tower Atmospheric Cherenkov Effect Experiment (Ap. J. 547, p. 949, 2001)
The Cosmic Ray Composition Between 1014-eV and 1016-eV (Astropart. Phys. 12:1-17, 1999)
Prototype Test Results of the Solar Tower Atmospheric Cherenkov Effect Experiment (STACEE) (NIM A408, p. 468, 1998)
Limits on the Isotropic Diffuse Flux of Ultra-high Energy gamma-radiation (Phys. Rev. Lett. 79, p.1805, 1997.)
READ A SOLAR NEUTRINO CARTOON HERE! Yes, the guy in the cartoon is supposed to be me. Blame my cartoonist wife, who drew it.
Scott Oser ( May 27, 2012