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Takano Lab
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A lab that approaches neutron stars and supernova explosions through the theory of atomic nuclei.
AboutAbout the lab
Looking inside stars with nuclear theory.
The Takano Lab studies atomic nuclei from the theoretical side.
A nucleus is a system of protons and neutrons bound by the nuclear force, but understanding its structure faces a major obstacle: the many-body problem.
So the lab considers nuclear matter, a hypothetical infinitely large nucleus, and determines its equation of state, mainly using the variational method.
The resulting equation of state is also applied to research on high-energy astrophysical phenomena such as neutron stars and supernova explosions.
Key terms
- Nuclear matter
- A hypothetical, infinitely large nucleus made of an infinite number of nucleons. It is considered in order to study the overall properties of atomic nuclei.
- Equation of state
- An equation that expresses how a material's energy and pressure relate to quantities such as density.
- Variational method
- A calculation method for problems that cannot be solved exactly, in which the form of the answer is assumed in advance and the best one is selected.
ResearchResearch themes
The lab conducts theoretical research on atomic nuclei. Centered on determining the equation of state of infinite, uniform nuclear matter through quantum many-body variational calculations, its work extends to applications in high-energy astrophysical phenomena such as neutron stars and supernova explosions.
*Illustrative imageEquation of state of nuclear matter
Even a lead nucleus is a 208-body problem and cannot be solved exactly. The lab therefore considers nuclear matter made of an infinite number of nucleons, solves the many-body problem with the variational method, and obtains the equation of state from the energy of nuclear matter.
*Illustrative imageApplications to neutron stars and supernova explosions
A neutron star is a small star with a radius of only about 10 km, but it has a mass comparable to the Sun's, and its interior is high-density nuclear matter. Based on the equation of state it has obtained, the lab investigates the structure of neutron stars and what triggers supernova explosions.
*Illustrative imageQuantum many-body systems and nuclear masses
The lab also studies liquid helium, a quantum fluid similar to nuclear matter, using the same many-body methods. It also carries out research on nuclear masses and β decay.
MembersFaculty
The Takano Lab consists of faculty members, researchers, master's students, and undergraduate students.As of 2026
- ProfessorMasatoshi Takano
VoicesStudent voices
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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: “Crab Nebula” NASA, ESA, J. Hester and A. Loll (Arizona State University) / Public domain (cropped)
- Equation of state of nuclear matter: “Dutch national supercomputer "Huygens"” Dennis van Zuijlekom / CC BY-SA 2.0 (cropped)
- Applications to neutron stars and supernova explosions: “Neutron Star Illustration ( -more-1)” CXC/M. Weiss / Public domain (cropped)
- Quantum many-body systems and nuclear masses: “Liquid helium superfluid phase” Alfred Leitner
（アップロード：Bmatulis） / Public domain (cropped) - Related lab (山田研究室): “Keplers supernova” NASA/ESA/JHU/R.Sankrit & W.Blair / Public domain (cropped)
- Related lab (辻川研究室): “Illustris Dark Matter and Gas” Illustris Collaboration / CC BY-SA 4.0 (cropped)
- Related lab (高野研究室): “Crowded cytosol” TimVickers / Public domain (cropped)
- Related lab (上田研究室): “Osteosarcoma cells stained for actin, microtubules, and nuclei” Howard Vindin / CC BY 4.0 (cropped)
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