The 2nd Nuclear Physics Tortoise Lecture Series (NPTLS)

11 Jan 2026, 00:00 → 16 Jan 2026, 23:59 Asia/Seoul

Nuclear Physics Tortoise Lecture Series 2026

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- Seeing the forest of nuclear density functionals, then building a spherical code.

- Now in its second year (launched in 2025), the Nuclear Physics Tortoise Lectures follows a simple motto:

go slowly, get it right!

This year’s theme offers a big-picture tour of nuclear energy density functional theory (DFT/EDF) as a unifying framework for finite nuclei and nuclear matter. Invited lecturers Kenichi Yoshida and Haozhao Liang will map the conceptual landscape—Kohn–Sham reduction of the many-body problem; the roles of normal and anomalous (pairing) densities; spontaneous symmetry breaking and, where appropriate, symmetry restoration; and a comparative view of Skyrme, Gogny, and covariant (relativistic) EDF families, including current practice in calibration and uncertainty assessment. Connections to observables (masses, radii, separation energies), bulk matter, and linear response (RPA/QRPA) keep the physics front and center.

In the hands-on component, participants will build a minimal, self-consistent spherical HF/HFB solver from scratch. Step by step, we set up the radial mesh and boundary conditions, assemble mean fields (including spin–orbit and Coulomb as needed), implement BCS/HFB pairing, and stabilize convergence with practical mixing strategies—culminating in calculations of binding energies, charge radii, and one-neutron separation energies. By the end of the school, attendees leave with (i) a working spherical code they understand line by line and (ii) a clear conceptual map of EDF physics that ties formal ideas to robust, reproducible computation—the Tortoise School way: deliberate, precise, and durable.

Venue

Science Building Room #326 (과학관 326호) ,50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea

view the location

Period

January 11 (Sun.), 2026 ~ January 16 (Fri.), 2026

 

Organizer

Myung-Ki Cheoun ( Soongsil Univ., Korea)

Youngman Kim (IBS, Korea)

Chang-Hwan Lee (Pusan Nat'l Univ.,  Korea)

Yeunhwan Lim ( Yonsei Univ., Korea)

Seung-il Nam ( Pukyoung Nat'l Univ., Korea)

 

Invited Lecturers

Kenichi Yoshida (RCNP, Osaka Univ.)

Hiroyuki Tajima (Tokyo University)

Contact Info.

010-4484-3477 (Gihwan Nam, 남기환)

   

 

The_2nd_Tortoise_school_Seoul.pdf

Sunday, 11 January

Registration

Convener: gihwan Nam (Yonsei Univ.)

Orientation

Convener: gihwan Nam (Yonsei Univ.)

Monday, 12 January

Chapter 1: Introduction to the Physics of Exotic Nuclei ---Theoretical Challenges

An overview of exotic nuclei far from stability, focusing on their
unique structural features and the theoretical difficulties in
describing weak binding, deformation, and continuum effects.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

NPTLS(2026)_Yoshida1 .pdf

10:30 Break

Chapter 2: Self-Consistent Mean-Field Theory

Introduction to self-consistent mean-field approaches, including
Hartree–Fock and Hartree–Fock–Bogoliubov theories, as the foundation
for modern nuclear structure calculations.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

12:00 Lunch

Chapter 3: Symmetry Breaking in Mean-Field Theory

Discussion of spontaneous symmetry breaking in nuclear mean-field
models and its physical significance for deformation and pairing
correlations.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

15:00 Break

Exercise 1: Mean-Field Calculations

Hands-on exercise introducing practical aspects of mean-field calculations.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

Tuesday, 13 January

Chapter 4: Basics of the Nuclear Energy-Density Functional (EDF) Method

Fundamental concepts of the nuclear EDF framework, including the
construction of functionals and their role in describing ground-state
properties across the nuclear chart.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

NPTLS(2026)_Yoshida2 .pdf

10:30 Break

Chapters 5 & 6: Time-Dependent Nuclear EDF and Collective Motion

Introduction to the time-dependent EDF approach and its application to
nuclear dynamics.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

12:00 Lunch

Chapters 5 & 6: Time-Dependent Nuclear EDF and Collective Motion

Introduction to the time-dependent EDF approach and its application to
nuclear dynamics.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

15:00 Break

Exercise 2: Nuclear EDF Calculations

Hands-on exercise focused on EDF-based calculations: the Kohn–Sham
method for spherical nuclei.

Convener: Prof. Kenichi Yoshida (RCNP, Osaka Univ.)

Wednesday, 14 January

Chapters 7 & 8: Nuclear EDF Applications to Exotic Nuclei

Advanced applications of the nuclear EDF method to exotic nuclei,
including weakly bound systems and collective excitations near the
drip lines.

Convener: Prof. Kenichi Yoshida

Yoshida3_Yonsei.pdf

10:30 Break

Chapters 7 & 8: Nuclear EDF Applications to Exotic Nuclei

Advanced applications of the nuclear EDF method to exotic nuclei,
including weakly bound systems and collective excitations near the
drip lines.

Convener: Prof. Kenichi Yoshida

Banquet (서울 서대문구 명물1길 2: 형제갈비 4층(불고기))

Thursday, 15 January

1. Introduction to ultracold atoms as a quantum simulator of nuclear systems

Convener: Prof. Hiroyuki Tajima

winter-school_1_Tajima.pdf

10:30 Break

2. Ultracold Fermi gas and renormalization

Convener: Prof. Hiroyuki Tajima

winter-school_2_Tajima.pdf

12:00 Lunch

3. BCS-Eagles-Leggett theory for the BCS-BEC crossover

Convener: Prof. Hiroyuki Tajima

winter-school_3_Tajima.pdf

15:00 Break

4. Exercise 1: Hands-on exercise of mean-field description

Convener: Prof. Hiroyuki Tajima

winter-school_4_Tajima.pdf

Friday, 16 January

5. Pairing fluctuations beyond mean-field theory

Convener: Prof. Hiroyuki Tajima

winter-school_5_Tajima.pdf

10:30 Break

6. Exotic superfluid and nucleon superfluidity

Convener: Prof. Hiroyuki Tajima

winter-school_6_tajima.pdf

12:00 Lunch

7. Exercise 2: Minimal framework for critical-temperature curve

Convener: Prof. Hiroyuki Tajima

winter-school_7_tajima.pdf

15:00 Break

8. Hadron-quark crossover from an ultracold-atom perspective

Convener: Prof. Hiroyuki Tajima

winter-school_8_tajima.pdf