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Elementary Particle Properties (Φ) Lab
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A neutron-experiment lab that explores particle physics through precision measurement.
AboutAbout the lab
Probing Beyond the Standard Model with ultra-precise measurements.
The Elementary Particle Properties Lab (Φ Lab) conducts experimental research in particle physics through precision measurement.
Particle physics often deals with laws at spatial scales smaller than atoms, and the phenomena involved are high-energy phenomena far beyond the energies we experience in daily life.
The lab therefore uses precision measurement to capture the tiny effects that high-energy phenomena produce in low-energy processes.
The lab currently works mainly on research using low-energy neutrons, which have no electric charge.
Key terms
- Particle physics
- A field that often deals with laws at spatial scales smaller than atoms. It covers phenomena far beyond the energies of everyday life.
- Precision measurement
- A method of studying particle physics by measuring the tiny effects that high-energy phenomena produce in low-energy processes.
- Neutron
- A particle with no electric charge. Because the influence of electric forces can be suppressed, it is well suited to precise observation of extremely faint interactions.
ResearchResearch themes
The Φ Lab conducts experiments that approach particle reactions in the high-energy region through precision measurement of low-energy processes. The main current research theme is experiments using low-energy neutrons, and the lab also develops apparatus and conducts joint research with other labs.
*Illustrative imageNeutron Lifetime Measurement
The lab aims to measure the neutron lifetime with high precision by detecting the electrons emitted when a neutron undergoes beta decay.
*Illustrative imageMeasuring the EDM Using the Electric Field Inside a Crystal
The lab uses the electric field inside a crystal to measure the electric dipole moment (EDM), testing violation of time-reversal symmetry and CP symmetry.
*Illustrative imageViolation of Time-Reversal and CP Symmetry
Using the neutron EDM and compound nuclear resonance absorption reactions, the lab tests violation of time-reversal symmetry and CP symmetry.
*Illustrative imageSearch for Dark Energy
Using neutron scattering and interferometers, the lab searches for unknown interactions.
MembersFaculty
The members of the Elementary Particle Properties Lab consist of faculty, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorHirohiko Shimizu
- Associate ProfessorMasaaki Kitaguchi
- Assistant ProfessorTakuya Okudaira
- Project ProfessorSaori Umehara
- Project Associate ProfessorHideki Kori
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Institute of nuclear and particle physics 00048 REP SDR-62 (0659)” DimitrisSideridis / CC BY-SA 4.0 (cropped)
- Neutron Lifetime Measurement: “The Daya Bay Antineutrino Detector ( )” Roy Kaltschmidt, Lawrence Berkeley National Laboratory / Public domain (cropped)
- Measuring the EDM Using the Electric Field Inside a Crystal: “Silicon single crystal” Massimiliano Lincetto / CC BY-SA 4.0 (cropped)
- Violation of Time-Reversal and CP Symmetry: “PixelMicromegasAtCompass” MicroMesh / CC BY-SA 3.0 (cropped)
- Search for Dark Energy: “Baffled LIGO Scientists” Nkij / CC BY 4.0 (cropped)
- Related lab (High Energy Particle Physics Lab (N)): “Accelerator Desy 2” Milkodromeda / CC BY-SA 4.0 (cropped)
- Related lab (Complexity Science Experiment (ΣE) Lab): “Experimental hall of the Wendelstein 7-X stellarator at IPP Greifswald 04” Siarhei Besarab / CC BY-SA 4.0 (cropped)
- Related lab (Optical Solid-State Physics (O) Lab): “Cold atoms experiment 02” Tomasz Kawalec / CC BY-SA 4.0 (cropped)
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