Greetings

Atomic nuclei are the building blocks of all visible matter, from inorganic materials to the human body and, eventually the universe. Nuclear properties, such as half-life, binding energy, excitation energy, radius, and deformation, are widely utilized in a variety of applied scientific fields ranging from medicine, environment, agriculture, industry, and historical research. Understanding the emergence of nuclear properties from first principles is a dream of nuclear physicists. The nuclear force is the heart of the nuclear physics. Since Hideki Yukawa's meson theory in 1935, it was believed that once the nuclear force acting between two nucleons (two-nucleon force, 2NF) is established, nuclei could be fully understood. Recently, the importance of the three-nucleon force that acts in more than two-nucleon systems is strongly indicated in various nuclear phenomena, which was initiated in the high-precision experiments of the three-nucleon scattering by the research director. Meanwhile, so far, the knowledge of the three-nucleon forces is pre-matured, not capable of applying them to the description of the nuclear phenomena with high-predictable power.

In this project, to establish the accurate and precise nuclear force, the coupling constants of the three-nucleon force are determined from high-precision polarization experiments on few-nucleon systems and the most reliable theory, i.e. the chiral effective field theory of nuclear force. Next, a quantum many-body precise calculation method using the nuclear force is established by utilizing Japan's own supercomputer, Fugaku. The cold atomic system is developed to simulate the simplest systems of the nucleus and then to test the calculation to be developed. By strengthening the fundamental science that describes nuclei from first principles, we aim to formulate the quantum many-body simulation tool to describe nuclear properties with extremely high predictive power. This is extended to the field of applied science via the nuclear data library.