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Quark Nuclear Science Institute (QNSI-UT)
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The institute explores the world of quarks and gluons inside protons and neutrons through accelerator experiments.
AboutAbout the lab
Into the tiny world deep inside the atomic nucleus
The Quark Nuclear Science Institute (QNSI) is a nuclear physics research organization launched in 2024 within the Graduate School of Science.
The institute studies worlds in which huge numbers of extremely small particles gather, such as atomic nuclei and the quarks that make up the protons and neutrons inside them (quantum many-body systems).
It uses state-of-the-art particle accelerators around the world, choosing the right one for each research target, and collaborates with theory that relies on large-scale computers and quantum computers.
Professor Gunji and Associate Professor Seidl belong to the High-Energy QCD Division and the EIC Promotion Office, and are advancing the plan for the Electron-Ion Collider (EIC) to be built in the United States.
Key terms
- Quark
- A smaller elementary particle that makes up protons and neutrons. It cannot be isolated on its own.
- Gluon
- An elementary particle that carries the strong force, which binds quarks together.
- Quantum many-body system
- A system in which many particles obeying quantum mechanics gather and influence one another. The atomic nucleus is one example.
- Fragmentation function
- A function that gives the probability with which high-energy quarks and gluons turn into the particles that are observed.
NewsLab news
View More ↗ResearchResearch themes
The institute aims to understand, in a continuous picture, how matter made of quarks and gluons behaves, from the inside of protons and neutrons to atomic nuclei and neutron stars. It is carrying out an international collaborative experiment (the ePIC experiment) using the Electron-Ion Collider (EIC) to be built at Brookhaven National Laboratory in the United States.
*Illustrative imageProbing the "vacuum" inside the nucleon
Protons and neutrons (nucleons) are said to consist of three quarks, but in reality their interior is filled with quarks, antiquarks, and gluons. To investigate this, the institute is taking a leading role in the EIC project.
*Illustrative imageApproaching the origin of mass and spin
Using experiments at the EIC and the Large Hadron Collider (LHC), the institute investigates how the origin of nucleon mass and spin, quark confinement, and related phenomena arise. It also works on the foundations of these experiments, such as high-resolution semiconductor sensors, and AI and large-scale data science.
*Illustrative imageMeasuring fragmentation functions
The institute extracts fragmentation functions, which describe how high-energy quarks and gluons break up into the particles that are finally observed, from electron-positron collisions in the Belle II experiment at the High Energy Accelerator Research Organization (KEK).
MembersFaculty
- ProfessorGunji TakuPublications ↗
- Associate ProfessorRalf SeidlPublications ↗
- Project Assistant ProfessorTakuya KumaokaPublications ↗
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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: “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Probing the "vacuum" inside the nucleon: “STAR Detector at Relativistic Heavy Ion Collider” Z22 / CC BY-SA 4.0 (cropped)
- Approaching the origin of mass and spin: “U.S. Department of Energy - Science - )” U.S. Department of Energy from United States / Public domain (cropped)
- Measuring fragmentation functions: “Belle II detector” Peacearth / CC BY-SA 4.0 (cropped)
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