Nuclear Theory Group, Tokyo Tech

Study, find, play and live with wonders of physics

Activities

We never stop, like tunas.

We are always seeking for something new. But, we don’t just study. We make people inspired. Presenting the latest research outcomes, having detailed discussions and exchanging ideas, we try to advance our understanding of physics in the universe.

Awards and Honors

2023

  1. K. Sekizawa, 2023 Tokyo Tech Challenging Research Award, Theme “Developing a Microscopic Theory for Describing Quantum Many-Body Tunneling Phenomena”, Aug. 2023.
  2. K. Yoshimura (M2), YONUPA2023 Best Presentation Awards, Title “Self-Consistent Superfluid Band Calculations for the Inner Crust of Neutron Stars”, Aug. 2023.
  3. K. Sekizawa, The Distinguished EPJ Referees 2022, Jan. 2023.

2021

  1. K. Sekizawa, The Award for the Promotion of Early-Career Researchers in School of Science, Tokyo Tech 2021, Theme “Development and Applications of Quantum Many-Body Theory of Heavy-Ion Multinucleon Transfer Reactions for Production of Unknown Unstable Nuclei”, Dec. 2021.

Preprints

  1. K. Sekizawa and K. Kaba (B4), Possible Existence of Extremely Neutron-Rich Superheavy Nuclei in Neutron Star Crusts Under a Superstrong Magnetic Field, arXiv:2302.07923 [nucl-th].

Articles

2023

  1. K. Yoshimura (D1) and K. Sekizawa, Superfluid extension of the self-consistent time-dependent band theory for neutron star matter: Anti-entrainment versus superfluid effects in the slab phase, Phys. Rev. C 109, 065804 (2024); arXiv:2306.03327 [nucl-th]. [Editors’ Suggestion]

2023

  1. R. Biswas, S. Nath, J. Gehlot, Gonika, C. Kumar, A. Parihari, N. Madhavan, A. Vinayak, A. Mahato, S. Noor, P. Sherpa, and K. Sekizawa, Determination of 1p- and 2p-stripping excitation functions for 16O+142Ce using a Recoil Mass Spectrometer, Eur. Phys. J. A 59, 60 (2023); arXiv:2109.03203 [nucl-ex].

2022

  1. P. Magierski, A. Makowski, M.C. Barton, K. Sekizawa, and G. Wlazłowski, Pairing dynamics and solitonic excitations in collisions of medium-mass, identical nuclei, Phys. Rev. C 105, 064602 (2022); arXiv:2111.05135 [nucl-th].
  2. K. Sekizawa, S. Kobayashi, and M. Matsuo, Time-dependent extension of the self-consistent band theory for neutron star matter: Anti-entrainment effects in the slab phase, Phys. Rev. C 105, 045807 (2022); arXiv:2112.14350 [nucl-th].
  3. B.J. Roy, S. Santra, A. Pal, H. Kumawat, S.K. Pandit, V.V. Parkar, K. Ramachandran, K. Mahata, and K. Sekizawa, Reaction mechanism study for multinucleon transfer processes in collisions of spherical and deformed nuclei at energies near and above the Coulomb barrier: The 16O+154Sm reaction, Phys. Rev. C 105, 044611 (2022); arXiv:2109.00674 [nucl-ex].
  4. K. Kobuszewski, K. Hossain, M.M. Forbes, P. Magierski, K. Sekizawa, and G. Wlazłowski, Rotating Quantum Turbulence in the Unitary Fermi Gas, Phys. Rev. A 105, 013304 (2022); arXiv:2010.07464 [cond-mat.quant-gas].

Journals

2023

  1. K. Sekizawa, Editor’s Note, The Nihon Butsuri Gakkaishi (Butsuri), Vol. 78, No. 6, pp. 349-350 (2023).

2022

  1. D. Jido, T. Nakamura, K. Sekiguchi, H. Fujioka, K. Sekizawa, S. Chiba, T. Katabuchi, T. Ishizuka, Y. Iizawa, T. Tanaka, and T. Matsui, Nuclear Physics Group, Tokyo Tech, Genshikaku Kenkyu, Vol. 67, No. 1, pp. 6-16 (2022).

Proceedings

2023

  1. K. Sekizawa and K. Yoshimura (M2), Time-Dependent Superfluid Band Theory for the Inner Crust of Neutron Stars: Current Status and Future Challenges, arXiv:2310.06411 [nucl-th].
  2. A. Makowski, M.C. Barton, P. Magierski, K. Sekizawa, and G. Wlazłowski, Manifestation of Pairing Modes in Nuclear Collisions, Acta Phys. Pol. B Proc. Suppl. 16, 4-A38 (2023); arXiv:2302.11193 [nucl-th].

External Lectures

2024

  1. K. Sekizawa, The World of Physics and Atomic Nuclei, A visiting lecture at Seibou Gakuen Junior & High School, Saitama, Japan, 31 Jan., 2024.

2023

  1. K. Sekizawa, The World of Physics and Atomic Nuclei, A visiting lecture at Otsuma Junior & Senior High School, Tokyo, Japan, 9 Nov., 2023.

2022

  1. K. Sekizawa, The World of Physics and Atomic Nuclei, A visiting lecture at Ohyu Gakuen Girls Junior & Senior High School, Tokyo, Japan, 14 Dec., 2022.

2021

  1. K. Sekizawa, Time-Dependent Hartree-Fock Theory and Its Extensions for Low-Energy Heavy-Ion Reactions, Online Lectures at IUAC School on Nuclear Reactions 2021, 15-20 Nov., 2021. [Lecture slides: #1, #2, #3]
  2. K. Sekizawa, Nuclear Dynamics from Time-Dependent Density Functional Theory: From Nuclear Reactions, Superfluid Phenomena, to Neutron Stars, Online Lectures at YONUPA Summer School 2021, 6-10 Aug., 2021. [Lecture slides: #1, #2, #3]

Seminars

2023

  1. K. Sekizawa, Microscopic Description of Neutron Star Crustal Matter: Recent Progress, An online UKAKUREN Nuclear Astrophysics Seminar, 14 Sep., 2023.

2022

  1. K. Sekizawa, Nuclear TDDFT: Past, Present, and Future, A seminar in the YITP Workshop “Fundamentals in density functional theory (DFT2022)”, Kyoto, Japan, 8 Dec., 2022. [Invited]
  2. K. Sekizawa, Microscopic Approaches for Macroscopic Phenomena of Neutron Stars, An online seminar at Department of Physics & Astronomy, National Institute of Technology (NIT), Rourkela, India, 10 Aug., 2022.
  3. K. Sekizawa, A Journey Through the Wonders of Physics with Atomic Nuclei, An online seminar at Department of Physics, Akal University, Punjab, India, 30 Mar., 2022.

2021

  1. K. Sekizawa, Exploring Quantum Many-Body Dynamics in Nuclear Systems: From Nuclei to Neutron Stars, An online seminar at Department of Physics, Ankara University, Ankara, Turkey, 23 Dec. 2021.
  2. K. Sekizawa, An Introduction to Nuclear Physics: Superheavy Element Synthesis, Neutron Stars, and Superfluid Phenomena, Winter Physics Colloquium (online) at Department of Physics, Tokyo Institute of Technology, Tokyo, Japan, 22 Dec. 2021.
  3. K. Sekizawa, Superfluid Dynamics in Fermionic Systems: From Unitary Fermi Gas to Nuclear Systems, A seminar for the Quantum Many-Body Physics Laboratory at Kindai University, Osaka, Japan, 8 Dec., 2021.
  4. K. Sekizawa, Dynamics of Quantized Vortices in Superfluid Fermionic Systems: From Cold Atoms to Neutron Stars, A seminar at the RIKEN Strangeness Nuclear Physics laboratory, RIKEN, Japan, 24 Jun., 2021.

Talks

2024

  1. K. Sekizawa, Prospects of Superheavy Formation in Terrestial and Stellar Environments, FRIB-TA Topical Program: The path to superheavy isotopes, Michigan State University, East Lansing, Michigan, USA, 3-7 Jun., 2024. [Invited]
  2. K. Sekizawa, Time-Dependent Microscopic Approaches for Low-Energy Heavy-Ion Reactions: Recent Progress and Discussion, The workshop on frontier nuclear studies with gamma-ray spectrometer arrays (gamma24), Osaka University Minoh Campus, Osaka, Japan, 26-28 Mar., 2024. [Invited]
  3. K. Sekizawa, Current Status and Perspectives of Time-Dependent Mean-Field Theories: Going Beyond TDHF, A workshop on Low-Energy Heavy-Ion Reactions and Chemistry of Superheavy Elements, Gakushikaikan, Tokyo, Japan, 3 Mar., 2024. [Invited]
  4. K. Sekizawa, Understanding Neutron Star Properties from Nucleons: Current Status and Prospects, The workshop on advancing physics at next RI beam factory (ADRIB24), RIKEN Wako Cumpus, Saitama, Japan, 24 Jan., 2024. [Invited]
  5. K. Sekizawa, Time-Dependent Density Functional Theory for Nuclear Many-Body Problems, The 5th International Workshop on Massively Parallel Programming for Quantum Chemistry and Physics (MPQCP 2024), RIKEN, Saitama, Japan, 10 Jan., 2024. [Invited]

2023

  1. K. Yoshimura (M2) and K. Sekizawa, Superfluid and Finite-Temperature Extensions of Self-Consistent Band Theory for the Inner Crust of Neutron Stars, Talk in a Minisymposium “Solid State Physics in Neutron Stars: Crystallography and Superfluidity” in the 6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (HAW23), Hilton Waikoloa Village, Hawaii, USA, 26 Nov. – 1 Dec., 2023.
  2. K. Sekizawa, K. Yoshimura (M2), and M. Matsuo, Time-Dependent Self-Consistent Band Theory for the Inner Crust of Neutron Stars: Anti-Entrainment Effects in the Slab Phase, Talk in a Minisymposium “Solid State Physics in Neutron Stars: Crystallography and Superfluidity” in the 6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (HAW23), Hilton Waikoloa Village, Hawaii, USA, 26 Nov. – 1 Dec., 2023.
  3. K. Sekizawa and K. Kaba (M1), A New Perspective of the Study of Superheavy Nuclei, The 6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan (HAW23), Hilton Waikoloa Village, Hawaii, USA, 26 Nov. – 1 Dec., 2023. [Invited]
  4. K. Sekizawa, Dreaming of Superheavy Nuclei: From Terrestrial Experiments to Celestial Origins, International Conference on Heavy-Ion Collisions at Near-barrier Energies (FUSION23), Shizuoka, Japan, 20-24 Nov., 2023. [Invited]
  5. R. Ichihashi (M2), Towards Microscopic Description of Pair Transfer in Low-Energy Heavy-Ion Reactions within Cb-TDHFB, The 6th workshop on many-body correlations in microscopic nuclear model, Sado, Niigata, Japan, 28-30 Sep., 2023.
  6. T. Hattori (M2), Study of Dynamics of Quantized Vortices and Flux Tubes in Neutron Stars, The 6th workshop on many-body correlations in microscopic nuclear model, Sado, Niigata, Japan, 28-30 Sep., 2023.
  7. K. Sekizawa, The Balian-Vénéroni Variational Principle: an Old, yet Novel Approach, The 6th workshop on many-body correlations in microscopic nuclear model, Sado, Niigata, Japan, 28-30 Sep., 2023.
  8. K. Yoshimura (M2) and K. Sekizawa, Superfluid and Finite-Temperature Extensions of Self-Consistent Band Theory for the Inner Crust of Neutron Stars, Observation and Theory of Neutron Stars: Research Activation Workshop 2023, Kyoto, Japan, 6-8 Sep., 2023.
  9. K. Sekizawa, Time-Dependent Superfluid Band Theory for the Inner Crust of Neutron Stars, A Workshop on “Microscopic approach from pair correlation to pair condensation”, Osaka, Japan, 28-30 Aug., 2023. [Invited]
  10. K. Yoshimura (M2) and K. Sekizawa, Self-Consistent Superfluid Band Calculations for Neutron Star Inner Crust, The 1st IReNA-Ukakuren Joint Workshop “Advancing Professional Development in Nuclear Astrophysics and Beyond”, National Astronomical Observatory of Japan, Tokyo, Japan, 28 Aug.-1 Sep., 2023.
  11. K. Sekizawa, Microscopic Description of Neutron Star Crustal Matter Based on Time-Dependent Density Functional Theory, KEK Workshop on “Thermal Quantum Field Theory and Its Applications”, Ibaraki, Japan, 28-30 Aug., 2023. [Invited]
  12. K. Yoshimura (M2) and K. Sekizawa, Self-Consistent Band Calculations for the Inner Crust of Neutron Stars, YONUPA Summer School 2023, Tokyo, Japan, 17-21 Aug., 2023.
  13. K. Sekizawa, Time-Dependent Density Functional Theory for Superfluid Dynamics in Neutron Star Crusts,
    The 34th IUPAP Conference on Computational Physics (CCP2023), Kobe International Conference Center, Hyogo, Japan, 4-8 Aug., 2023.
  14. K. Sekizawa, Microscopic Description of the Inner Crust of Neutron Stars based on a Superfluid Band Theory, Kyushu University Nuclear Theory Workshop “Extensions and Perspectives of Modern Nuclear Physics”, Fukuoka, Japan, 19-21 Jul., 2023. [Invited]
  15. K. Sekizawa, Time-Dependent Density Functional Theory for Superfluid Dynamics in the Inner Crust of Neutron Stars (online), A Workshop on “Bridging the Gaps: Interdisciplinary Collaborations in Constraining the Physics of Finite Nuclei, Neutron Stars and Dark Matter”, NIT-Rourkela, India, 3-7 Jul., 2023. [Invited]
  16. K. Sekizawa, Possible Existence of Extremely Neutron-Rich Superheavy Nuclei in Neutron Star Crusts Under a Superstrong Magnetic Field, The 4th International Conference on Advances in Radioactive Isotope Science (ARIS2023), Palais des Papes, Avignon, France, 4-9 Jun., 2023.
  17. K. Sekizawa, Microscopic Description of Neutron Star Crustal Matter: Recent Progress, Numazu Workshop 2023 “Remaining issues of neutrino, nuclear physics in neutron stars & supernovae”, Numashin COMPASS, Numazu, Shizuoka, Japan, 28 Mar., 2023.
  18. K. Sekizawa, Time-Dependent Density Functional Theory for the Inner Crust of Neutron Stars: Superfluid Dynamics and Band Structure Effects, JPS Spring Meeting 2023, Online Meeting, 25 Mar., 2023.
  19. K. Yoshimura (M1) and K. Sekizawa, Self-Consistent Superfluid Band Calculations for Neutron Star Inner Crust, JPS Spring Meeting 2023, Online Meeting, 24 Mar., 2023.
  20. K. Yoshimura (M1) and K. Sekizawa, Time-Dependent Band Theory for the Inner Crust of Neutron Stars: Extension to Include Superfluidity, INTPART School 2023, Okinawa, Japan, 20 Feb. – 3 Mar., 2023.

2022

  1. K. Yoshimura (M1) and K. Sekizawa, Time-Dependent Band Theory for the Inner Crust of Neutron Stars: Extension to Include Superfluidity, YITP Workshop “Fundamentals in density functional theory (DFT2022)”, Kyoto, Japan, 12 Dec., 2022.
  2. K. Yoshimura (M1) and K. Sekizawa, Self-Consistent Band Calculations for Neutron Star Inner Crust and Its Extension for Superfluid Neutrons, JPS 2022 Fall Meeting, Okayama University, Okayama, Japan, Sep. 6, 2022.
  3. K. Yoshimura (M1) and K. Sekizawa, Self-consistent band calculations for neutron star inner crust and its extension for superfluid neutrons, YONUPA Summer School 2022, Online, 6-9 Aug., 2022.
  4. K. Sekizawa, Time-Dependent Density Functional Theory for the Inner Crust of Neutron Stars, RCNP Workshop on “Low-Energy Nuclear Physics and High-Energy Astronomy for Understanding Neutron Stars”, Online meeting, 4 Aug., 2022. [Invited]
  5. K. Sekizawa, Time-Dependent Microscopic Approaches for Heavy-Ion Multinucleon Transfer Reactions: Recent Progress, International workshop on Physics of RI: Recent progress and perspective (website), RIKEN, Saitama, Japan, 30 May – 1 Jun., 2022. [Invited]
  6. K. Sekizawa, Recent Developments in Microscopic Theories for Low-Energy Heavy-Ion Reactions: Towards Superheavy Element Synthesis, International symposium on Developments of Physics of Unstable Nuclei (YKIS2022b), YITP, Kyoto, Japan, 23-27 May, 2022. [Invited]
  7. K. Sekizawa, P. Magierski, A. Makowski, M.C. Barton, G. Wlazłowski, Novel Superfluid Dynamics in Low-Energy Heavy-Ion Reactions, JPS 77th Annual Meeting, Online Meeting, 15-19 Mar., 2022.
  8. T. Sasaki, K. Sekizawa, M. Matsuo, Study of Vortex Pinning/Unpinning Mechanisms in Time-Dependent Gross-Pitaevskii Equation, JPS 77th Annual Meeting, Online Meeting, 15-19 Mar., 2022.
  9. K. Sekizawa, Entrainment Effects in Neutron Stars: Overview and Progress, JSPS/NRF/NSFC A3 Foresight Program “Nuclear Physics in the 21st Century” Joint Annual Meeting, Online Meeting, 17-18 Feb., 2022. [Invited]

2021

  1. K. Sekizawa, S. Ayik, Kinetic Energy Dissipation and Fluctuations in Stochastic Mean-Field Theory, JPS 2021 Fall Meeting, Online Meeting, 14-17 Sep., 2021.
  2. K. Sekizawa, Numerical Simulations for Superfluid Dynamics in Fermionic Systems, Nuclear- and Particle-Physics Divisions Joint Symposium on “Nuclear and Particle Physics in the (Post-)Fugaku Era”, The 76th JPS Annual Meeting, Online Meeting, 12-15 Mar., 2021. [Invited]
  3. K. Sekizawa, S. Ayik, Stochastic Mean-Field Theory for Heavy-Ion Multinucleon Transfer Reactions, JPS 76th Annual Meeting, Online Meeting, 12-15 Mar., 2021.

    *Names of our group members are emphasized by underlined-bold fonts.
    Especially, names of (BSc/MSc/PhD) students are highlighted by pink color.

We eager to have inputs from you. You are always welcome to have a seminar!

Check out upcoming seminars!

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