Reina Maruyama headshot.

Reina Maruyama

she/her/hers
Professor of Physics
Yale Physics Department

Reina Maruyama is a professor of physics at Yale University. Her research focuses on the study of neutrinos and fundamental symmetries, astrophysics & cosmology, elementary particles, quantum science, and sensing; with particular focus on understanding the particle nature of dark matter and neutrinos and the role of symmetry in fundamental physics.

Professor Maruyama develops technologies and carries out experiments to probe the underlying physics of fundamental symmetries, origins of the Universe, and nature of neutrinos and dark matter. The Maruyama group uses techniques being developed in the fields of quantum sensors, atomic, nuclear, particle, and astrophysics to solve some of the greatest mysteries of the evolution of the Universe.

Before joining the faculty at Yale University, she was on the faculty at the University of Wisconsin and a postdoctoral researcher at the University of California-Berkeley.

Professor Maruyama received her Bachelor of Science degree in Applied Physics from Columbia University, and Masters and Ph.D. in Physics from The University of Washington. Her thesis work was Optical Trapping of Ytterbium Atoms

Appointments

2021 – present Professor of Physics, Yale University

2016 – 2021 Associate Professor of Physics, Yale University

2013 – 2016 Assistant Professor of Physics, Yale University

2011 – 2013 Assistant Professor of Physics, University of Wisconsin-Madison

2006 – 2010 Assistant Scientist, IceCube Research Center, University of Wisconsin-Madison

2003 – 2006 Chancellor’s Postdoctoral Fellow, Postdoctoral Research Associate, University of California & Lawrence Berkeley National Laboratory

1996 – 2003 Graduate Research Assistant, Department of Physics, University of Washington, Seattle

Education

2003 Ph.D. Physics, University of Washington, Seattle, WA, USA
Thesis: “Optical Trapping of Ytterbium Atoms,” Thesis Advisor: E. Norval Fortson 

1996 M.S. Physics, University of Washington, Seattle, WA, USA 

1995 B.S. Applied Physics, Columbia University, New York, NY, USA

Honors & Awards

  • Connecticut Academy of Science and Engineering (CASE), 2021.
    • Citation: “World leader for seminal contributions in rare searches and fundamental physics, designing and leading novel dark matter and neutrino physics experiments.”
  • American Physical Society (APS) Fellow, 2020.
    • Citation: “For innovative and wide-ranging contributions to the experimental study of rare events and fundamental symmetries, especially the search for neutrinoless double beta decay, and for leadership in understanding the signature and nature of dark matter.”
  • Sloan Research Fellow, 2014 – 2016
  • NSF CAREER Award, 2012 – 2017
  • Yale Junior Faculty Fellowship, 2015 – 2016
  • Yale Public Voices Fellow, 2013 – 2014
  • Woman Physicist of the Month, Committee on the Status of Women in Physics (CSWP) June 2013
  • Chancellor’s Postdoctoral Fellowship, University of California, Berkeley: 2003–2006

Scientific Leadership

Axion Dark Matter at Yale experiments

2025-present PI and Spokesperson of the ALPHA experiment

2023-2025 PI and Deputy Spokesperson of the ALPHA experiment

2018-present PI of the RAY experiment

2017-present co-PI of the HAYSTAC experiment

COSINE-100 experiment 

2015-present PI and Scientific co-Spokesperson

2016 Co-lead for conceptualization, design, construction, and implementation of COSINE-100 dark matter experiment

DM-Ice experiment

2010-present Led the design, construction, deployment, and operation of DM-Ice17. Led R&D program and successfully demonstrated reduction of the background inducing impurities in sodium-iodide detectors by a factor of 20. Initiated and currently coordinate an international consortium of NaI experiments.

2010-2020 PI and Scientific Spokesperson. 

CUORE Experiment

2004 – Present Founding member of the CUORE Experiment

2014-Present Institutional representative on the CUORE Collaboration Council

2023-2025 CUORE U.S. Spokesperson

2015-2018 CUORE Council Co-Chair 

2013-2015 CUORE Physics Board lead

2015 Led the 2015 CUORE-0 Physical Review Letters publication

IceCube Experiment

2009-2011 IceCube Supernova Working Group convenor 

2008-2011 IceCube Digital Optical Module (DOM) testing lead

2009 – 2011 Lead DOM deployment team, member of the IceCube construction at the South Pole

Outreach

  • Conference for Women in Physics
  • Science on Saturdays at Yale and other public talks
  • IceCube Outreach Programs
  • 2008/09 QuarkNet
  • Education Outreach, Lawrence Berkeley National Laboratory
  • Often quoted in popular science press such as APS News, Nature News, Science News, and Symmetry Magazine for her work on dark matter and neutrinoless double beta decay.
  • Chosen by Ingenium to be featured on a poster for their Women in STEM initiative, intended to engage, advance and retain the interest of young women in the STEM fields. 

Selected Publications

  • A quantum-enhanced search for dark matter axions”, HAYSTAC Collaboration, Nature 590, 238-242 (2021).
  • “Improved Limit on Neutrionless Double-Beta Decay in  130Te with CUORE”, CUORE Collaboration, Phys. Rev. Lett. 124, 122501 (2020).
  • “A Search for solar axion Induced signals with COSINE-100”, COSINE Collaboration, Astropart. Phys. 114 (2020).
  • “Search for a Dark Matter-Induced Annual Modulation Signal in Nat(Tl)with the COSINE-100 Experiment”, COSINE Collaboration, Phys. Rev. Lett. 123, 031302 (2019).
  • “An experiment to search for dark-matter interactions using sodium iodide detectors,” COSINE-100 Collaboration, Nature 566 (2019) no.7742.
  • “Search for a Dark Matter-Induced Annual Modulation Signal in NaI(Tl) with the COSINE-100 Experiment,” COSINE-100 Collaboration, Phys. Rev. Lett 123 (2019) 031302.
  • “Results from phase 1 of the HAYSTAC microwave cavity axion experiment,” HAYSTAC Collaboration, Phys. Rev. D 97 (2018) 092001. 
  • “First Results from CUORE: A Search for Lepton Number Violation via 0νββ Decay of 130Te”, CUORE Collaboration, Phys. Rev. Lett. 120 (2018) 132501.
  • “First data from DM-Ice17,” DM-Ice Collaboration, Phys. Rev. D 90 (2014) 092005. 
  • “Evidence for High-Energy Extraterrestrial Neutrinos at the IceCube Detector,” IceCube Collaboration, Science 342 (2013) 1242856.
  • “Measurement of the beta-nu correlation of Na-21 using shakeoff electrons,” P.A. Vetter et al., Phys. Rev. C 77 (2008) 035502.
  • “Investigation of sub-Doppler cooling in an ytterbium magneto-optical trap,” R. Maruyama et al., Phys. Rev. A 68 (2003) 011403(R).

Contact Info

reina.maruyama@yale.edu

+1 (203) 432-3386

WL 209 (office)
WLC 248 & 250 (labs)