Ryan MacLellan

Ryan MacLellan

Assistant Professor


Akeley-Lawrence Science Center 309

Phone: (605) 677-3990

Email: Ryan.MacLellan@usd.edu


  • Ph D, Queen's University, 2009
  • BS, Honours Astrophysics, Saint Mary's University, 2001


Citations listed below are presented in a standardized, modified format for display purposes only. They do not necessarily reflect the preferred style and conventions of the faculty member or discipline.

  • MacLellan, Ryan. An optimal energy estimator to reduce correlated noise for the EXO-200 light readout. In Journal of Instrumentation. Journal of Instrumentation, 2016.
  • MacLellan, Ryan. Cosmogenic Backgrounds to neutrinoless double-beta decay in EXO-200. In Journal of Cosmology and Astroparticle Physics. Journal of Cosmology and Astroparticle Physics, 2016.
  • MacLellan, Ryan. First Search for Lorentz and CPT Violation in Double Beta Decay with EXO-200. In Phys Rev D. Phys Rev D, 2016.
  • MacLellan, Ryan. Search for 2 neutrino double-beta decay of Xe-136 to the 0_1^+ excited state of Ba-136 with EXO-200. In Phys Rev C. Phys Rev C, 2016.
  • MacLellan, Ryan. Measurements of the ion fraction and mobility of alpha- and beta-decay products in liquid xenon using the EXO-200 detector. In Phys Rev C 92. Vol. 92. Phys Rev C, 2015. (DOI: 10.1103/PhysRevC.92.045504)
  • MacLellan, Ryan. Investigation of radioactivity-induced backgrounds in EXO-200. In Phys Rev C 92. Vol. 92. Phys Rev C, 2015. (DOI: 10.1103/PhysRevC.92.015503)
  • MacLellan, Ryan. An RF-only ion-funnel for extraction from high-pressure gases. In Int J Mass Spectrometry 379, 110-120. Vol. 379. Int J Mass Spectrometry, 2015. (DOI: 10.1016/j.ijms.2015.01.003)
  • MacLellan, Ryan. Spectroscopy of Ba and Ba+ deposits in solid xenon for barium tagging in nEXO. In Phys Rev A 91. Vol. 91. Phys Rev A, 2015. (DOI: 10.1103/PhysRevA.91.022505)

Awards and Honors:

  • 2016 Fundamental Physics Prize, Fundamental Physics Prize Foundation, 2016
  • Nobel Prize in Physics, Royal Swedish Academy of Sciences, 2015


  • MacLellan, Ryan. Result from, and status of, EXO-200. Presented at the APS April Meeting, Salt Lake City. (April 18, 2016)
  • MacLellan, Ryan. The next generation neutrinoless double-beta decay experiment nEXO. Presented at the APS April Meeting, Salt Lake City. (April 18, 2016)