David Hornidge

M. Bashkanov and 65 others, Neutron polarization transfer,Cn_x', in π+&�Բ��; photoproduction off the proton, Phys Lett. B 847, 138273 (2023)
D. Ghosal and 72 others, Helicity dependant cross sections for the photoproduction of

pairs from quasi-free nucleons, for publication in Phys. Lett. B 847, 138283 (2023)
S. Adhikari and 152 others, Measurement of the J/ψψ photoproduction cross section over the full near-threshold kinematic region, Phys. Rev. C. 108, 025201 (2023)
M. Bashkanov and 69 others, First measurement of polarization transfer Cn_x',in deuteron photodisintegration, Phys. Lett. B 844, 138080 (2023)
J. Adam and 438 others, ATHENA detector proposal- totally hermetic electron nucleus apparatus proposed for IP6 at the Electron-Ion Collider, J. Instrum. 17, 10019 (2022)
F. Cividini and 70 others, Measurement of the helicity dependence for single πº&�Բ��; photoproduction from the deuteron, Eur. Phys. J.A 58, 113 (2022).
E. Mornacchi and 92 others, Measurement of Compton scattering at MAMI for the extraction of the electric and magnetic polarizabilities of the proton, Phys. Rev. Lett. 128, 132503 (2022).
C.R. Howell and 52 others, International Workshop on Next Generation Gamma-Ray Source, J. Phys. G: Nucl. Part. Phys. 49, 010502 (2022).
C. Mullen and 81 others, Single πº production off neutrons bound in deuteron with linearly polarized photons, Eur. Phys. J. A. 57, 205 (2021).
D. Paudyal and 92 others, Spin polarizabilities of the proton measured by Compton double-polarization observables, Phys. Rev. C. 102, 035205 (2020).
M. Dieterle and 81 others, Helicity-dependent cross sections for the photoproduction of πº pairs from nucleons, Phys. Rev. Lett. 125, 062001 (2020).
M. Bashkanov and 73 others, Signatures of the d*(2380) hexaquark in

, Phys. Rev. Lett. 124, 132001 (2020).
V. Sokhoyan and 90 others, Measurement of the beam-helicity asymmetry in photoproduction of πº η pairs on carbon, aluminum, and lead, Phys. Lett. B. 802, 135243 (2020).
W.J. Briscoe and 92 others, Cross section for 'yn→ πº n at the Mainz A2 experiment, Phys. Rev. C 100, 065205 (2019).
M. Bashkanov and 72 others, Deuteron photodisintegration by polarized photons in the region of the d * (2380), Phys. Lett. B 789, 7 (2019).
C.S. Akondi and 85 others, Experimental study of the

reactions at the Mainz Microtron, Eur. Phys. J. A 55, 11 (2019).
A. Kaser and 82 others, First measurement of helicity-dependent cross sections in πº η photoproduction from quasi-free nucleons, Phys. Lett. B 786, 305 (2018).
M. Dieterle and 83 others, Photoproduction of πº Mesons off Protons and Neutrons in the Second and Third Nucleon Resonance Region, Phys. Rev. C 97, 065205 (2018).
S. Prakhov and 94 others, High-statistics measurement of the η → 3 πº decay at MAMI, Phys. Rev. C. 97, 065203 (2018).
V. Sokhoyan and 96 others, Experimental study of the yp → πº ηp reaction with the A2 setup at MAMI , Phys. Rev. C. 97, 055212 (2018).
P. Adlarson and 88 others, Measurement of the decay η' → πº πº η at MAMI , Phys. Rev. D. 98 , 012001 (2018).
M. Dieterle and 87 others, First measurement of the polarization observable E and helicity-dependent cross sections in single πº photoproduction from quasi-free nucleons, Phys. Lett. B 770, 523 (2017).
V.L. Kashevarov and 90 others, Study of η and η' Photoproduction at MAMI, Phys. Rev. Lett. 118, 212001 (2017).
L. Wittauer and 84 others, Helicity-dependent cross sections and double-polarization observable E in η photoproduction from quasifree protons and neutrons, Phys. Rev. C. 95, 055201 (2017).
P. Adlarson and 97 others, Measurement of the

Dalitz decay at the Mainz Microtron, Phys. Rev. C. 95, 025202 (2017).
V. Sokhoyan and 76 others, Determination of the scalar polarizabilities of the proton using beam asymmetry Σ₃ in Compton scattering, Eur. Phys. J. A 53 14 (2017).
L. Wittauer and 83 others, Insight into the Narrow Structure in η Photoproduction on the Neutron from Helicity-Dependent Cross Sections, Phys. Rev. Lett. 117, 132502 (2016).
S. Gardner and 101 others, Photon asymmetry measurements of

Eur. Phys. J. A 52, 333 (2016).
A. Kaser and 69 others, Photoproduction of ηπ-pairs off nucleons and deuterons, Eur. Phys. J. A 52, 272 (2016).
J.R.M. Annand and 64 others, T and F asymmetries in πº photoproduction on the proton, Phys. Rev. C 93 , 055209 (2016).

Education

Postdoctoral Fellow, Experimental Subatomic Physics, Johannes Gutenberg Universität Mainz, Germany, 1999-2003
Ph.D. Experimental Subatomic Physics, University of Saskatchewan, 1999
M.Sc. Theoretical Subatomic Physics, University of Saskatchewan, 1995
B.Sc. with High Honours, University of Saskatchewan, 1992

Teaching

In 2022/2023

PHYS 1401 Physics of Music and Sound
PHYS 1051 General Physics I
PHYS 3821 Quantum Mechanics I
PHYS 4990 Honours Thesis

Recently taught:

PHYS 1551 General Physics II
PHYS 2251 Classical Waves
PHYS 3451 Mathematical Methods for Physics
PHYS 3811 Modern Physics
PHYS 4831: Advanced Quantum Mechanics
PHYS 4851: Fundamental Particles

Honours theses since 2010:

2023 : Vincent Bruening, Testing the Energy Resolution Capabilities of the Compton and Two Photon Spectrometer
2022 : Alicia Postuma, The Compact A2 Time Projection Chamber
2021: Jenna Chisholm, Extraction of Spin-Dependent Polarizabilities Through Compton Scattering Events
2021: Isabelle Dolan, Implementing wavelength shifting compound in active ³ He target to determine neutron polarizabilities
2021: Selina Gaudreault, Compton Scattering from the Proton in the (1232) Region
2020:Michael Perry, 3- and 4-Helium Targets for Compton Scattering Experiments
2019: Matthew Mullins, An Active Target Cell for High Pressure Helium-3 Gas
2018: Robert Materi, A Global Fitting Routine to Extract the Spin Polarizabilities
2018: Sara Ripley, Tracking Studies using GenFit for the MUSE Experiment
2018: Maeve Wentland, An Active Helium Target for Neutron Polarizabilities
2017: Kalli Hood, Proton Detection Efficiency of a Polarized Active Target
2016: Meg Morris, Neutron Scalar Polarizabilities: Background Simulations for Experimental Extraction via Compton Scattering from³He
2016: Hannah Stegen, Neutron Multipoles from Pion Photoproduction
2016: Ryan Baker, Investigating the Crystal Ball Detector Energy Calibrations
2016:Jeremy Crowe, The Proton Detection Efficiency of the CB and TAPS Detectors
2014: Scott Clarke, Timelike Virtual Compton Scattering
2014: Joshua Landry, Cross Section Calculations for Compton Scattering from the Proton Near Pion Threshold
2013: Ryan Bennett, Kinematic Fitting for Neutral Pion Identification with Compton Scattering
2013: Andrew MacLean, Triggers for the CB-TAPS Set-Up
2012: Robert Lee MacDonald, Performance Testing of Experimental Nuclear Physics Data Acquisition and Detection Software
2012: Chris Sherman, Proton Efficiency in the CB-TAPS Set-Up
2012: Ari Silburt, Improvement of the Compton Beam Asymmetry
2011: Monica Firminger, Dilution Factors for a Butanol Frozen-Spin Target
2010: Darin Eddy, A First Measurement of the Beam Asymmetry for Compton Scattering
2010: Alex Laffoley, Polarization Analysis for a Near-Threshold Neutral Pion Production Measurement

My field of research is medium-energy experimental subatomic physics, with the specific goal of testing models of the strong nuclear force through the study of hadron structure. To this end, we carry out experiments at low- and intermediate-energy nuclear physics laboratories such as the Mainz Microtron (MAMI) in Mainz, Germany, the Jefferson Laboratory (JLab) in Newport News, Virginia, and the Triangle Universities Nuclear Laboratory (TUNL) at Duke University in Durham, North Carolina. In the past we have participated in measurements at the now defunct Saskatchewan Accelerator Laboratory in Saskatoon (now the Canadian Light Source), and MaxLab in Lund, Sweden. Most of our current efforts are focused on work in the A2 Collaboration at the Mainz Microtron but in the longer term we intend to get more involved with experiments at JLab and TUNL. Additionally, we are one of the founding groups in the nascent Electron-Ion Collider Canada Collaboration, and our contributions will ramp up over the next few years.

One of our present projects is a program of Compton scattering experiments to extract the scalar and spin polarizabilities of the nucleon, i.e. the proton and neutron. These quantities are fundamental structure constants like the charge and mass, but contain information on the internal structure and dynamics of the nucleon. To conduct these experiments, we use the relativistic electron beam of MAMI and the tagging system to produce both polarized and unpolarized photon beams, which are incident on targets of both polarized and unpolarized protons and neutrons. The Crystal Ball and TAPS detectors, arranged in a nearly 4π set-up, detect the scattered photons and recoil nucleons in the final state. After analyzing the data and separating out the background processes, and with the help of theoretical models, we obtain the polarizabilities, which can then be compared to theoretical predictions in order to test the validity of these models.

Research Collaborations

Compton@HIGS

GlueX at Hall D JLab

Electron Ion Collider Canada

A2 and CB-TAPS at the Mainz Microtron

Grants, awards & honours

2022-2027 - NSERC Subatomic Physics Individual Discovery Grant, Investigating Hadron Structure at Low and Medium Energies, Principal Investigator, $75,000 per year

2022 - Paul Paré Excellence Award - �r��TV��Ƶ

2021- 2023 - NSERC Subatomic Physics- Project, Canadian Participation in the Electron-Ion Collider , Co-applicant with four others, $73,500 per year

2018- 2022 - NSERC Subatomic Physics- Project, Investigations of Hadron Structure using CB-TAPS at the Mainz Microtron , Principal Investigator and co-applicant with two others, $145,000 per year

2013- Paul Paré Medal - �r��TV��Ƶ

2012- 2020 - Deutsche Forschungsgemeinschaft, Collaborative Research Center 1044, The Low Energy Frontier of the Standard Model: From Quarks and Gluons to Nucleons and Nuclei , Mainz, Germany, Teilprojektleiter (Principal Investigator) along with 18 others,€ 3,000,000 ($4,500,000) per year

2011- Paul Paré Excellence Award - �r��TV��Ƶ

2011- Professor of the Year (co-winner with D. Fleming) - Physics Society

2008- Paul Paré Excellence Award - �r��TV��Ƶ

2006- Professor of the Year - Physics Society