Detector Science
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Building the instruments that make the invisible visible
At Oak Ridge National Laboratory, detector science begins with questions that standard tools cannot answer. Across neutrino physics, nuclear structure and astrophysics, collider science, and radiological monitoring, ORNL researchers design and build advanced detectors that reveal rare signals, increase precision, and open new paths to discovery.
Detector science at ORNL is not a single technology or a single experiment. It is a physics-driven capability built around instrumentation, integration, electronics, computing, data systems, and analysis—developed to solve some of the hardest measurement problems in modern science.
Why detector science matters
Detector science is what turns possibility into measurement. It takes phenomena that are too rare, too faint, or too complex to observe with standard tools and makes them accessible.
When researchers need to detect an event that may happen only rarely, separate subtle signals from overwhelming background, or capture information in extreme or uncertain environments, the detector becomes more than an instrument – it becomes part of the scientific breakthrough.
This is where ORNL excels. The laboratory combines deep experience in detector design with strengths in physics, materials, computation, user facilities, and large-scale collaboration. From germanium detectors used in rare-event searches to calorimeters and tracking systems for next-generation collider experiments, ORNL builds the tools needed to make the invisible visible.
The same capabilities that power these frontier physics experiments also strengthens national security. ORNL’s detector science not only advances our understanding of matter and the universe, but it also enhances sensing technologies that monitor nuclear materials, strengthen transparency, and improve the nation’s ability to identify and respond to emerging threats.
Challenge Areas
Rare-event searches
ORNL develops detector systems for experiments that look for extraordinarily rare processes—measurements that demand ultra-low backgrounds, high resolution, and long-term stability. These efforts help scientists with tasks such as testing whether the Standard Model of Physics is complete and probing some of the deepest questions in particle physics.
Field detection systems
Imperfect field environments require sensor systems to operate in changing conditions – such as temperature extremes or in the rain – yet still perform at peak performance levels. ORNL is developing cutting-edge field detection systems that are highly efficient, very low power (operating on milliwatts), integrate multiple disparate sensor streams, and integrate edge computing with AI/ML for advanced decision making.
Collider detector systems
Collider experiments depend on the ability to accurately track the paths of particles produced. Frontier experiments demand ever higher collision rates, and experiments that explore the structure of matter require highly integrated detector architectures. ORNL contributes tracking, calorimetry, particle identification, electronics, and readout strategies for major collider efforts.
Neutrino measurements
Neutrinos are among the most elusive particles in nature, and studying them requires custom-built detectors, careful shielding, and sophisticated analysis. ORNL advances neutrino detector systems for nuclear reactor, spallation-source, and underground neutrino experiments that expand how scientists can study neutrino interactions and properties.
Advanced readout, AI, and data acquisition
Modern detectors need to do more than sense—they need to process data. ORNL is developing advanced front-end electronics, streaming readout systems, and AI-enabled approaches that help manage large data volumes, improve signal selection, and accelerate the path from measurement to insight.
Rare isotopes and nuclear decay
Understanding unstable nuclei and the origin of the elements depends on detector arrays that can capture multiple forms of radiation with speed, flexibility, and precision. ORNL builds instrumentation for decay spectroscopy and rare-isotope research that builds understanding of nuclear structure and nuclear astrophysics.
Quantum Detectors
Quantum sensing uses the physics mechanisms of entanglement, back-action evasion, and superposition to develop systems that reach sensitivities beyond standard classical approaches. ORNL is building capabilities that combine quantum optics, spin defects, cryogenic measurement, nanophotonics, muon/neutron detector expertise, and HPC.
Detector Simulations
ORNL develops particle tracking code that integrates electromagnetic interactions and photon transport on high-performance computing platforms. High fidelity detector response is provided connecting measured signals back to the underlying physics.
Nuclear monitoring and security
Nuclear monitoring and security
Detector science at ORNL also supports nuclear monitoring, safeguards, and nonproliferation by translating advanced sensing and imaging into tools for real-world use. This work connects directly to ORNL’s broader detector strengths: high-resolution radiation imaging, precise characterization, advanced diagnostics, and the ability to build complete detector systems by advancing sensor system electronics, software, materials, and data acquisition technologies from end to end.
ORNL’s national security vision emphasizes improved sensing and detection to provide translational solutions for national and global challenges, including monitoring and verification for nuclear arms control, maritime sensing, emergency response, real-time nuclear material accounting, and the development of new data science methods and detector technologies for extreme environments.
Applying detector science to hard-to-assess objects and materials
ORNL’s gamma imaging and neutron radiography capabilities are designed to determine the location, quantity, and type of radiation within closed objects or containers, helping support nuclear arms control monitoring and verification, transportation monitoring, reactor infrastructure integrity study, and real-time nuclear material accounting. These detectors rely on continued advances in detector active volumes, electronics, imaging methods, and analysis workflows.
Precise characterization
ORNL’s integrated analytical capabilities support rapid and legally defensible nuclear forensics and safeguards work by helping determine the composition, origin, and intended use of nuclear materials. Together, ORNL’s nondestructive imaging and destructive analysis provide a distinctive end-to-end capability: detect, characterize, interpret, and support action.
Automated sensing platforms with embedded AI
Many of ORNL’s systems and platforms combine advanced detectors, edge computing, and AI to enable autonomous and/or rapid response solutions for monitoring, emergency response, and national security applications. For example, ORNL’s CANINES (Coordinated Autonomous Navigable Instruments for Nuclear Emergency Search) can rapidly identify anomalies, adapt to changing environments, and provide actionable information in real time; and the CRAFTI (Compact Radiation detection Array For Tracking and Interdiction) integrates sensing modalities spread across geographic locations.
Featured Projects
LEGEND
LEGEND
The Large Enriched Germanium Experiment for Neutrinoless Double Beta Decay, or LEGEND, uses high-purity germanium detectors to search for one of the rarest decays in science that could answer one of physics’ most intriguing questions—why is there apparently more matter than antimatter in the universe. ORNL leads the DOE project and brings decades of expertise in germanium detector development, building on its major role in the Majorana Demonstrator.
COHERENT
COHERENT
At the Spallation Neutron Source (SNS), the COHERENT collaboration uses multiple detector technologies to study neutrino interactions in ways that were impossible only a few years ago. ORNL helped create the experimental foundation for this work and continues to support a growing neutrino science program based on custom instrumentation.
ePIC
ePIC
The ePIC detector will be the first for the future Electron-Ion Collider. ORNL is helping design and build key detector systems to study how quarks and gluons shape protons, neutrons, and nuclei. This work reflects a major ORNL strength in integrating advanced instrumentation, electronics, and high-rate data strategies for frontier physics.
FRIB Decay Station
FRIB Decay Station
ORNL is helping develop advanced detector systems for the Facility for Rare Isotope Beams, including the FRIB Decay Station and its initiator systems. These instruments support measurements of unstable nuclei that are essential to understanding nuclear structure, stellar processes, and the origins of the elements.
Nab
Nab
ORNL is leading the Nab (Neutron “a” and “b”) experiment, which measures the properties of neutron decay, a process governed by the weak nuclear force, with unprecedented precision. Based at the Fundamental Neutron Physics Beamline at ORNL’s Spallation Neutron Source, Nab utilizes specialized silicon-based detectors to precisely determine the energy of the electrons and protons emerging from decaying neutrons, allowing a complete reconstruction of the decay process.
The ORNL Advantage
Physics-driven design
Detectors are developed to answer specific scientific questions, with instrumentation tightly connected to the measurements researchers need to make—from rare events and isotopes to neutrinos and collider science. ORNL starts with the precise physics need and designs detectors to answer the questions being pursued by researchers.
Detector materials and enabling technologies
Detector performance starts with the materials of the sensor itself. ORNL’s materials research spans germanium, silicon, scintillators, neutron and gamma-ray systems, along with related enabling technologies that improve sensitivity, timing, resolution, and scalability across many types of experiments.
End-to-end capability
ORNL teams possess world leading expertise across detector materials, design, simulation, electronics, mechanics, integration, software, and analysis, covering the full spectrum of detector design, prototyping, testing, and deployment.
Major-facility connections
From underground experiments to reactor sites, spallation neutron sources, and high-energy colliders, detector science at ORNL is closely linked to world-class facilities and collaborations, including SNS, HFIR, FRIB, and the future Electron-Ion Collider.
A culture of building
ORNL has a long history of developing new detector technologies when off-the-shelf approaches are not sufficient to meet the need. ORNL has a proven track record developing purpose-built instruments for the most challenging physics problems.
Computing, data expertise, and AI
ORNL’s detector capabilities are closely coupled with the lab’s global leadership in high-performance computing, AI, and data management. Advanced data systems, analysis methods, and AI-enabled tools help researchers handle complex signals and extract more value from each experiment. ORNL is developing premiere AI methods and tools to enhance sensing and decision making.
People and perspectives
People and perspectives
Detector science is about more than physics; it is also a story about the people who build the tools needed for discovery.
At ORNL, scientists and engineers work where difficult questions, ambitious experiments, and emerging technologies meet. They design systems that do not yet exist, solve integration problems across disciplines, and train the next generation of researchers to work at the frontier of measurement.
This builder mindset is part of the laboratory’s broader culture. It shapes not only the instruments that ORNL contributes to major collaborations, but also the way students, postdoctoral researchers, and staff learn to tackle complex problems with creativity, collaboration, and rigor.
Power in collaboration
A key feature of detector development efforts at ORNL is building powerful collaborations not only within the laboratory, but across the U.S. and international science communities. For example, ORNL provides scientific leadership to the ePIC and LEGEND projects, but hundreds of members from across the globe play important roles. Both projects are flagships of collaborative detector development in nuclear physics.
Big impacts can come in smaller packages, as well. The GODDESS detector collaboration, with a detector array that fits on a tabletop, has supported large numbers of researchers from the U.S. and abroad, including dozens of undergraduate students and Ph.D. thesis projects. Similarly, the FRIB Decay Station Initiator, large components of which are led by ORNL, has supported measurements at FRIB from researchers at institutions outside of ORNL.
The benefits of these advancements are not limited to their original applications.
The high-rate capability, tracking precision, sensor granularity, readout speed and radiation resistance of the current generation of silicon detectors resulting from ORNL science has led to their widespread adoption, particularly in collider experiments (like STAR, ALICE, sPHENIX, and the future EIC experiment, ePIC), for which ORNL has been leading efforts in readout and data acquisition systems. Similarly, ORNL’s Photon Digital Converter devices are being developed and characterized with future use cases in nuclear security, medical imaging, fundamental high energy and nuclear physics, and space-based instruments.
Broad capabilities in semiconductor radiation detectors developed at ORNL also span high-energy physics, neutron science, electron microscopy, and gamma-ray imaging. ORNL is also pioneering the use of Timepix4 hybrid pixel detectors for high-resolution neutron beam imaging at the SNS. Another Timepix4 application is NEUROPIX, which is developing a new kind of artificial intelligence for scientific detectors based on spiking neural networks (SNNs), a computing approach inspired by how the human brain processes information. By emulating these natural neural processes, NEUROPIX aims to create detector systems that can recognize patterns, filter noise, and make rapid decisions using far less power and with much lower delay than traditional electronics.
ORNL physicists also leverage strengths within the lab to access the power of collaboration.
One key requirement for LEGEND-1000’s success is ensuring there are no interfering signals that could mask the double beta decay or neutrino signal. There are a few naturally occurring radionuclides that can interfere with the signal, and it is surprisingly common for materials such as steel or copper to have trace levels of some naturally occurring radionuclides. This is where physicists interface with analytical chemists at ORNL who specialize in trace elemental analysis, analyzing all the materials used in the project to ensure they contain less than 1 part per trillion of interfering radionuclides.
Together, these collaborative activities position ORNL as a leader in next-generation detector technologies across multiple scientific and national security domains. They show how progress in detector science rarely comes from a single discipline or institution, but from the sustained exchange of expertise across physics, engineering, chemistry, computation, and large‑scale experimentation. The breadth of ORNL’s partnerships – from laboratory detector arrays, deployable multi-modal sensing, to multi‑nation flagship collaborations – demonstrates ORNL’s unique ability to convene diverse teams, integrate complementary capabilities, and turn complex scientific challenges into practical, deployable solutions. These wide‑reaching projects highlight not only the value of ORNL’s scientific leadership, but also the essential role of global collaboration in answering the hardest questions in science and accelerating the development of transformative detector technologies.
Looking ahead
Looking ahead
Detector science will continue to shape ORNL’s contributions to major physics experiments and quickly address the emerging real-world problems over the coming decades.
Future work includes scaling up detector systems for rare-event searches, building the first detector for the Electron-Ion Collider, expanding neutrino measurement capabilities, and advancing instrumentation for rare-isotope science. At the same time, ORNL is developing new readout architectures, detector materials, and analysis approaches that will influence the next generation of experiments. These efforts increasingly leverage AI/ML to accelerate data interpretation, enhance signal discrimination, and enable more autonomous, real‑time detector performance, ensuring ORNL continues to stay ahead of emerging challenges and future experimental and national security needs.
The goal is consistent across all these efforts: to build instruments that expand what science can observe, measure, and understand.
