Douglas Bryman
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Particle physics experiments at CERN, Geneva, TRIUMF, and the Paul Scherr Institut (Villigen, Swtizerland); advanced detector technology development; data analysis and machine learning projects.
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Doctoral Student Supervision
Dissertations completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest dissertations.
The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio, defined as the relative rate of decay of pions into electrons over muons including associated neutrinos and radiative components (denoted R_π) to a precision level of O(0.1%). This Standard Model (SM) observable provides a sensitive test of lepton universality, where weak coupling strengths are assumed to be equal for all leptons (g=g_e=g_μ= g_τ). Comparing the measured experimental (R_π^exp) and calculated SM (R_π^SM) ratios, the ratio of the coupling constants can be extracted and compared with the SM expectation g_e/g_μ=1 as follows g_e /g_μ = (R_π^exp/R^π^SM )¹/².The current theoretical calculation of the SM prediction R_π^SM=1.2352±0.0002)×10-⁴ with a precision of 0.016% is more precise than the measurements of previous generation experiments by a factor of 30; thus, there is scope for significant improvement. If the measurement is consistent with the SM, new constraints could be set on new physics scenarios for SM extensions, such as R-parity-violating super-symmetry, leptoquarks, and heavy neutrinos lighter than the pion. Most remarkably, a deviation from the SM could result from a new pseudo-scalar interaction with an energy scale of up to O(1000TeV) which would enhance the branching ratio by O(0.1%). In some instances, these constraints can far exceed the reach of direct searches at colliders.Between 2009 and 2012 around 6.5 million π+→e+ν_e events were gathered. The analysis of a subset of the 2010 data with 0.4 million events was published in 2015, giving R_π^exp=(1.2344±0.0023(stat.)±0.0019(syst.))×10-⁴, with a precision of 0.24%. This is in agreement with the SM, representing a 0.12% measurement of lepton universality at g_e/g_μ=0.9996±0.0012. The analysis presented in this thesis is blinded but includes the highest quality data portion available, around 3 million π⁺→e⁺ν_e events. For this work, major experimental systematic problems have been solved allowing for increased precision up to 0.12% for R_π^exp and up to 0.06% for lepton universality.
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The pion decay branching ratio is an importantobservable in the Standard Model of particle physics. The value of thebranching ratio has been calculated within the Standard Model tobe (1.2352 ± 0.0002) ×10^−4. The PIENU experiment at TRIUMFaims to measure this quantity to a precision of
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The pion branching ratio (R^π = [formula omitted] ) is an auspicious observable for a test of the standard model of particle physics (SM). Rπ has been calculated within this framework with high precision because the strong interaction dynamics cancel out in the ratio and the structure dependence only appears through electroweak corrections. Since the discovery of the electronic pion decay in 1958, Rπ was measured with increasing precision and confirmed the SM value of RπSM = 1.2352(2) x 10⁻⁴. However, the current experimental precision is 20 times worse than the theoretical one leaving a large window for potential new physics at “high-mass" scales (up to ∽1000 TeV).The PIENU experiment aims at measuring Rπ with an improved precision by a factor larger than 5 over the previous experiment at TRIUMF (Rπexp = (1.2265 ± 0:0056) x 10⁻⁴) in order to confront the theoretical prediction at the 0.1% level. The result presented in this thesis focuses on a fraction of the data taken since the beginning of physics data taking in 2009. A blind analysis has been implemented in order to avoid a human bias. With this set of data, the procedure is established for the final analysis. An improvement by a factor 1.17, dominated by statistical uncertainty, has been reached in the branching ratio precision. If added to the current Particle Data Group value, the result of this analysis reduces the uncertainty on the branching ratio by ∽25%.
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Master's Student Supervision
Theses completed in 2010 or later are listed below. Please note that there is a 6-12 month delay to add the latest theses.
The NA62 experiment aims at measuring the branching ratio of the ultra-rare decay K⁺ → π⁺νν ̄ with 10% precision. To achieve the desired precision, high levels of background rejection must be accomplished using techniques such as high-resolution timing, kinematic rejection, particle identification, and hermetic vetoing of photons. K⁺ → π⁺π0 (Kπ₂) decays, one of the largest background sources, are mainly rejected by kinematics reconstruction and photon vetoing in NA62. To evaluate Kπ₂ background rejection capabilities of the NA62 system, we studied the inefficiency of these two techniques. Kπ₂ and K⁺ → μ⁺ν (Kμ₂) events were selected from 2015 minimum bias data runs using Kπ₂/Kμ₂ separation cuts whose efficiency was also studied in details. The inefficiency of kinematics suppression was found to be (2.16 ± 0.21) × 10-³, and the upper limit of the photon veto inefficiency was 7 × 10-⁷ at 90% confidence level. Combined with correction factors from Monte Caro simulations, a preliminary result, S/B > 0.2, was estimated for Kπ₂ background in the measurement of K⁺ → π⁺νν ̄. Also, an upper limit on the branching ratio of the invisible decay π0 → νν ̄, 4.3×10-⁷, was obtained at 90% confidence level.
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The branching ratio of pions decaying to positrons and muons R = (π→eυ + π→eυγ)/(π→μυ + π→μυγ) has been calculated with very high precision in the Standard Model of particle physics. So far, the theoretical value of R = 1.2352(1) x 10-⁴ is 40 times more precise than the current experimental value of R = 1.230(4) x 10-⁴. To test this variable with respect to deviations from the Standard Model, the experimental precision needs to be improved, which is why the PIENU experiment aims at a precision of less than 10-³, i.e. an improvement of an order of magnitude over the current precision. At this level, mass scales ∼ TeV/c² can be probed for evidence of new pseudo-scalar interactions. The data collected with the experimental setup also allows for a search of sterile neutrinos. When determining the branching ratio, various systematic corrections are applied. The largest among these is due to electro-magnetic shower leakage out of the calorimeters and radiative decays. It was calculated to be (2.25 ± 0.06) % in this thesis.In the second part of the thesis, an experiment on the direct radiative capture of muons in zirconium is described. One theoretical extension to the Standard Model involves a new light and weaklyinteracting particle in the muon sector which does not conserve parity. This can be studied experimentally with polarized muons that undergo the direct radiative capture into the 2S state of a medium mass target nucleus. During this capture, longitudinal muon polarization is conserved and the muons instantly undergo the 2S-1S transitionemitting a second photon. Studying the angular distribution of this second photon indicates whether or not the process is parity violating, which would manifest physics beyond the Standard Model. The direct radiative capture of a muon into an atom in the 1S or 2S state has not been observed yet. Therefore, data was taken in 2012 to studythe radiative capture of muons in zirconium. The analysis method of this data set is described with a blind analysis technique.
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Electric field calculations and ionization signal simulations in a liquid xenon detector for Positron Emission Tomography have been performed. The electric field was calculated using Opera 3D, a Finite Element Method application software. The uniformity of the electric field inside of the detector was evaluated by calculating the deviation of drifting electrons under the applied electric field. The ionization signals of the detector have been simulated. The comparison between simulation results and measurement signals was made.
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The capabilities and system performance of a high-resolution micro-PET system based on liquid xenon have been studied. Monte-Carlo simulations of scintillation events within a single sector of a twelve-sector prototype have been performed, and the results have been analyzed using Neural Network algorithms. The ability of the system to distinguish interaction points using scintillation information has been analyzed and presented. Monte-Carlo simulations of a full scale prototype have also been performed using NEMA standard mouse and rat phantoms. A novel scatter suppression scheme based on weighted Line of Response data is presented, and the effects on scatter fraction and background noise are analyzed.
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Publications
- Upper limits on branching ratios of the lepton-flavor-violating decays τ→ℓγγ and τ→ℓX (2021)
Physical Review D, - Constraints on sterile neutrinos in the MeV to GeV mass range (2019)
Physical Review D, - First search for K + →π + νν¯ using the decay-in-flight technique (2019)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 791, 156-166 - Improved constraints on sterile neutrinos in the MeV to GeV mass range (2019)
Physical Review D, 100 (5) - Search for production of an invisible dark photon in π 0 decays (2019)
Journal of High Energy Physics, 2019 (5) - Searches for lepton number violating K+ decays (2019)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 797 - First results on the rare decay K + → π + νν¯ from the NA62 experiment at CERN (2018)
Universe, 4 (11) - Improved search for heavy neutrinos in the decay π →eν (2018)
Physical Review D, 97 (7) - K+ → π+νν first NA62 results (2018)
Proceedings of Science, 316 - Kl3 form factors with NA48/2 and NA62 status (2018)
Acta Physica Polonica B, Proceedings Supplement, 11 (3), 617-623 - NA62 and NA48/2 results on search for Heavy Neutral Leptons (2018)
EPJ Web of Conferences, 179 - Search for exotic particles at NA62 (2018)
Proceedings of Science, 316 - Search for exotic particles at the NA62 experiment (2018)
Universe, 4 (11) - Search for heavy neutral lepton production in K+ decays (2018)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 778, 137-145 - Search for heavy neutral leptons at the NA62 experiment at CERN (2018)
International Journal of Modern Physics A, 33 (31) - Search for heavy neutrinos at the NA48/2 and NA62 experiments at CERN (2018)
EPJ Web of Conferences, 182 - Search for K+ → π+νν¯ at NA62 (2018)
EPJ Web of Conferences, 182 - Initial results from the PIENU experiment (2017)
Hyperfine Interactions, 238 (1) - NA48/62 latest results (2017)
Proceedings of Science, 2017- - New limits on heavy neutrinos at NA62 (2017)
Proceedings of Science, 2017- - Precision measurement of the π+→e+νe branching ratio in the PIENU experiment (2017)
Proceedings of Science, 2017- - Recent results and prospects for NA62 experiment (2017)
Nuclear and Particle Physics Proceedings, 285-2, 104-109 - Search for K+→π+νν‾ at NA62 (2017)
Nuclear and Particle Physics Proceedings, 282-2, 101-105 - Search for massive neutrinos in π+→e+νe decay (2017)
Hyperfine Interactions, 238 (1) - Search for K + → π + ννat the NA62 experiment (2016)
EPJ Web of Conferences, 130 - Search for K+ → π+vv at the NA62 experiment at CERN (2016)
Proceedings of Science, Part - Search for K+ → π+νν at NA62 (2016)
Proceedings of Science, Part - Search for the rare decay K+ →μ+ν ν ν SEARCH for the RARE DECAY ... A. V. ARTAMONOV et al. (2016)
Physical Review D, 94 (3) - The kaon identification system at the NA62 experiment at CERN (2016)
Proceedings of Science, Part - Blind Test of Muon Geotomography for Mineral Exploration (2015)
ASEG Extended Abstracts, 2015 (1), 1 - Detector for measuring the π+ → e+νe branching fraction (2015)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 791, 38-46 - Improved Measurement of the π→eν Branching Ratio. (2015)
- Prospects for K+ → π+vv observation at CERN in NA62 (2015)
Proceedings of Science, 22-29 - Search for heavy neutrinos in K+ →μ+νH decays (2015)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 91 (5) - Status of the PIENU experiment at TRIUMF (2015)
Journal of Physics: Conference Series, 631 (1) - Comments on Charged Lepton Flavor Violation (2014)
Nuclear Physics B - Proceedings Supplements, 248-2, 99--102 - New Light Shed on Dark Photons (2014)
Physics, 7 - Status of the PIENU experiment (2014)
Journal of Physics: Conference Series, 556 (1) - Two nucleon (B − L)-conserving reactions involving tau leptons (2014)
Physics Letters B, 733, 190--192 - PIENU experiment at TRIUMF: A sensitive probe of new physics (2013)
AIP Conference Proceedings, 1560, 125-127 - A liquid xenon detector for PET applications: Simulated performance (2012)
Progress in Biomedical Optics and Imaging - Proceedings of SPIE, 8313 - Construction, commissioning and first data from the CRIPT muon tomography project (2012)
IEEE Nuclear Science Symposium Conference Record, , 738-742 - Machine learning for the cosmic ray inspection and passive tomography project (CRIPT) (2012)
IEEE Nuclear Science Symposium Conference Record, , 91-94 - Massive neutrino search in the decay π +→e +ν (2012)
AIP Conference Proceedings, 1441, 471-473 - Measurement of the pion branching ratio at TRIUMF (2012)
AIP Conference Proceedings, 1441, 564-566 - Precision tests of electron-muon universality with pions (2012)
Nuovo Cimento della Societa Italiana di Fisica C, 35 (4), 63-67 - Prototype testing and algorithm development for the Cosmic Ray Inspection and Passive Tomography (CRIPT) project (2012)
IEEE Nuclear Science Symposium Conference Record, , 959-963 - Simulations of a micro-PET system based on liquid xenon. (2012)
- Bounds on Majoron emission from muon to electron conversion experiments (2011)
Phys. Rev. D, 84 (11) - Joint 3D inversion of muon tomography and gravity data (2011)
International Workshop on Gravity, Electrical & Magnetic Methods and Their Applications, Beijing, China, October 10–13, 2011, - Liquid xenon detectors for positron emission tomography (2011)
Journal of Physics: Conference Series, 312 (SECTI) - Performance of a drift chamber candidate for a cosmic muon tomography system (2011)
AIP Conference Proceedings, 1412, 129-136 - Rare Kaon and Pion Decays: Incisive Probes for New Physics Beyond the Standard Model (2011)
Annu. Rev. Nucl. Part. Sci., 61 (1), 331--354 - Search for massive neutrinos in the decay π→eν (2011)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 84 (5), 1546-1549 - Simulations and imaging algorithm development for a cosmic ray muon tomography system for the detection of special nuclear material in transport containers (2011)
Canadian Nuclear Society - 32nd Annual Conference of the Canadian Nuclear Society and 35th CNS/Can Student Conference 2011, 1, 503-517 - SU‐C‐211‐06: High Resolution Pre‐Clinical PET System Based on Liquid Xenon Gamma Ray Detectors (2011)
Medical Physics, 38 (6), 3376-3377 - SU‐E‐I‐114: Simulations of Scintillation Events in a High‐Resolution Liquid Xenon Micro‐PET System (2011)
Medical Physics, 38 (6), 3422 - SU‐E‐I‐177: Electric Field and Ionization Signal Simulation in Liquid Xenon Detectors for PET (2011)
Medical Physics, 38 (6), 3437 - The PIENU experiment at TRIUMF: A sensitive probe for new physics (2011)
Journal of Physics: Conference Series, 312 (SECTI) - The suitability of large area drift chambers as the technology choice for the Cosmic Ray Inspection and Passive Tomography (CRIPT) project (2011)
ANIMMA 2011 - Proceedings: 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications, - Cosmic ray muon tomography system using drift chambers for the detection of Special Nuclear Materials (2010)
IEEE Nuclear Science Symposium Conference Record, , 547-551 - Measurement of the K+→π0μ+νμγ branching ratio (2010)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 81 (9) - RARE KAON DECAYS (2010)
Applications of High Intensity Proton Accelerators, 04 (01), 79--114 - Study of a large NaI(Tl) crystal (2010)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 621 (1-3), 188-191 - Treasure-hunting with space rays (2010)
CIM Magazine, 5 (2), 62 - Cosmic Ray Inspection and Passive Tomography for SNM Detection (2009)
- High purity pion beam at TRIUMF (2009)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 609 (2-3), 102-105 - PIENU experiment at TRIUMF: Measurement of π→ev/π →-μV branching ratio (2009)
AIP Conference Proceedings, 1182, 702-705 - Simultaneous reconstruction of scintillation light and ionization charge produced by 511 keV photons in liquid xenon: Potential application to PET (2009)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 607 (3), 668-676 - Study of the decay K+→π+νν̄ in the momentum region 140<Pπ<199MeV/c (2009)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 79 (9) - Design and performance of liquid xenon detectors for PET (2008)
IEEE Nuclear Science Symposium Conference Record, , 1637-1639 - Flavor physics of leptons and dipole moments (2008)
European Physical Journal C, 57 (1-2), 13-18 - Measurement of the K+→π+νν̄ branching ratio (2008)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 77 (5) - New measurement of the K+-->pi+ nunu branching ratio. (2008)
- Investigation of liquid xenon detectors for PET: Simultaneous reconstruction of light and charge signals from 511 keV photons (2007)
IEEE Nuclear Science Symposium Conference Record, 4, 2889-2891 - Prospects for measurements of the π →eν branching ratio (2007)
Proceedings of Science, - Simulation of compton reconstruction in liquid xenon PET (2007)
2007 IEEE Nuclear Science Symposium Conference Record, - AS A PROBE OF NEW PHYSICS (2006)
Int. J. Mod. Phys. A, 21 (03), 487--504 - Pointing Calorimeter for Measuring $K^0_L \rightarrow \pi^0\nu \bar {\nu}$ Decay and Development of Extruded Scintillator (2006)
Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications, - Pointing calorimeter for measuring K L0 → π 0 vv decay and development of extruded scintillator (2006)
Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 9th Conference, , 323-327 - Facilities and Methods: Rare Kaon Decays: Investigations into the Heart of Matter 1 (2005)
Nuclear Physics News, 15 (4), 28--33 - Search for the decay K + → π + γγ in the π + momentum region P > 213 MeV/c (2005)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 623 (3-4), 192-199 - Upper limit on the branching ratio for the decay π0→νν̄ (2005)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 72 (9) - Further search for the decay K +→π +νν̄ in the momentum region P<195 MeV/c (2004)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 70 (3) - Improved measurement of the K+-->pi+nunu; branching ratio. (2004)
- Further evidence for the decay k + → π + νν̄ (2002)
Physical Review Letters, 88 (4), 418031-418034 - Further evidence for the decay K+ -->pi+nu(nu). (2002)
- Search for the decay K + → π + νν̄ in the momentum region P π < 195 MeV/c (2002)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 537 (3-4), 211-216 - Search for the rare decay K + → π +γ (2002)
Physical Review D, 65 (5) - Development of GaAs-CCDs for X-ray detection (2001)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 460 (1), 72-75 - Prospects for measuring K+ → π+ νν and K0L → π0 νν at BNL (2001)
Nuclear Physics B - Proceedings Supplements, 99 (3), 61-69 - Search for the decay [Formula Presented]→[Formula Presented][Formula Presented]ν [Formula Presented] (2001)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 63 (3), 5 - Further search for the decay K+→π+ν¯ν (2000)
Physical Review Letters, 84 (17), 3768-3770 - Light absorption in a resistive-gate GaAs charge-coupled device (2000)
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, 18 (2), 582-587 - Measurement of direct photon emission in K+-->pi(+)pi(0)gamma decay (2000)
- Measurement of structure-dependent K+ → μ+νμγ decay (2000)
Physical Review Letters, 85 (11), 2256-2259 - Rare and Exotic Decays (1999)
Techniques and Concepts of High Energy Physics X, , 111--145 - X-ray detection with GaAs RGCCDs (1999)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 434 (1), 30-33 - Central tracking chamber with inflated cathode-strip foils (1998)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 404 (2-3), 295-304 - Upper limit on the decay [Formula Presented] (1998)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 58 (1) - Upper limit on the decay K+ → e+νμ+μ- (1998)
Physical Review D - Particles, Fields, Gravitation and Cosmology, 58 (1), 120031-120033 - 500 MHz transient digitizers based on GaAs CCDs (1997)
Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 396 (3), 394-404 - Evidence for the decay K+→π+vv¯ (1997)
Physical Review Letters, 79 (12), 2204-2207 - Observation of the decay K+ → π+ μ+ μ− (1997)
Physical Review Letters, 79 (24), 4756-4759 - Observation of the Decay K+ → π+γγ (1997)
Physical Review Letters, 79 (21), 4079-4082 - Search for massive neutrinos in pi +--> micro+ nu decay. (1996)
- Search for the decay K+--> pi + nu nu -bar. (1996)
- Measurement of the pi +-->e+ nu branching ratio. (1994)
- Erratum: Search for the decay K+→π+νν̄ (Physical Review Letters (1993) 71, 2 (305)) (1993)
Physical Review Letters, 71 (2), 305 - Search for the decays K+--> pi + nu nu -bar and K+--> pi +X0 for 150 (1993)
- A detector to search for K+ → π+ νν (1992)
Nuclear Inst. and Methods in Physics Research, A, 321 (1-2), 129-151 - Improved search for massive neutrinos in pi +-->e+ nu decay. (1992)
- Search for the decay pi 0--> gamma +X. (1992)
- tau -e and tau - micro universality from tau --> pi nu decays. (1992)
- A search for K + → π + v v ̄ and other rare K + decays (1991)
Nuclear Physics, Section A, 527 (C), 727-730 - Upper limit on the branching ratio for the decay pi 0--> nu nu -bar. (1991)
- Search for the decay K+--> pi + gamma gamma. (1990)
- A study of K + → π + νν (1989)
Nuclear Physics B (Proceedings Supplements), 8 (C), 364-371 - Search for a light Higgs boson in the decay K+--> pi +H, H--> micro+ micro- (1989)
- Search for the Rare Decay K + ←φ + vv̄ Presented by D. R, Marlow for the E787 Collaboration (1989)
Annals of the New York Academy of Sciences, 578 (1), 202-214 - Search for muon-electron and muon-positron conversion. (1988)
- Searches for majoron production and other processes associated with decay (1988)
Physical Review D, 37 (5), 1131-1133 - Consequences of nonzero neutrino masses on the evaluation of the weak coupling constant and on tau leptonic decays. (1987)
- CYLINDRICAL DRIFT CHAMBER FOR THE MEASUREMENT OF K yields pi nu nu DECAY. (1987)
IEEE Transactions on Nuclear Science, 35 (1) - Searches for muon-electron and muon-positron conversion in titanium. (1987)
- Central drift chamber for rare kaon decay spectrometer (1986)
IEEE Transactions on Nuclear Science, 33 (1), 178-180 - Constraints on massive neutrinos in pi -->e nu decay. (1986)
- Exotic muon decay micro-->e+x. (1986)
- Measurement of the pi-->e nu branching ratio. (1986)
- An RF separator for cloud muons at triumf (1985)
Nuclear Inst. and Methods in Physics Research, A, 234 (2), 235-243 - Gated grid system used with a time projection chamber (1985)
Nuclear Inst. and Methods in Physics Research, A, 234 (1), 42-46 - Search for micro-e conversion in Ti. (1985)
- Search for muon electron conversion μ-+Ti → e-+Ti (1985)
Nuclear Physics, Section A, 434 (C), 469-474 - Pion double charge exchange at 50 MeV on C14 (1984)
Physical Review Letters, 52 (2), 105-108 - The spatial resolution of the time projection chamber at triumf (1984)
Nuclear Instruments and Methods In Physics Research, 219 (3), 461-471 - Update on the TPC at triumf (1984)
Nuclear Instruments and Methods In Physics Research, 225 (3), 547-549 - New measurement of the π→eν branching ratio (1983)
Physical Review Letters, 50 (1), 7-10 - New upper limit on the decay μ→eγγ (1983)
Physical Review Letters, 51 (3), 164-167 - The triumf time projection chamber data acquisition system (1983)
IEEE Transactions on Nuclear Science, 30 (5), 3793-3796 - Decay π 0 → μ e (1982)
Phys. Rev. D, 26 (9), 2538--2539 - π→ev, π→evγ decays and related processes (1982)
Physics Reports, 88 (3), 151-205 - Construction and initial tests of the time projection chamber at TRIUMF (1981)
Physica Scripta, 23 (4), 668-673 - Double beta decay (1978)
Rev. Mod. Phys., 50 (1), 11--21 - Pionic 2p1s X-ray transitions in 19F and 23Na (1978)
Nuclear Physics, Section A, 312 (3), 361-367 - X-rays from pionic 3He (1978)
Physics Letters B, 74 (3), 179-182 - Delay line readout of the anode wires in a multiwire proportional chamber (1977)
Nuclear Instruments and Methods, 141 (3), 573--576 - New limit on the decay μ+→e+γ (1977)
Physical Review Letters, 39 (18), 1113-1116 - Revised value for the π → e ν branching ratio (1975)
Phys. Rev. D, 11 (5), 1337--1337 - Double Beta Decay and Δ Q = 2 Currents (1973)
Phys. Rev. D, 8 (1), 342--344 - Double beta decay via resonances in the nucleus (1973)
Physics Letters B, 46 (2), 157-159 - Lepton number violation in double-beta decay (1973)
Nuclear Physics B, 64, 525--530 - Measurement of the K L 0 Mean Life (1972)
Phys. Rev. D, 6 (7), 1834--1851 - Search for the reaction μ-+Cu→e++Co (1972)
Physical Review Letters, 28 (22), 1469-1471
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