Microscopic understanding of nucleon many-body systems on the basis of three-nucleon forces of chiral effective field theory

2015 Fiscal Year Final Research Report

• Project/Area Number: 25400266
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University (2014-2015); Kyushu Dental College (2013)
• Principal Investigator: Kohno Michio 大阪大学, 核物理研究センター, 協同研究員 (40234710)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: ３体核力 / 核物質 / カイラル有効場理論 / 原子核の飽和性 / 密度依存有効２体力 / スピン軌道力 / テンソル力 / 微視的光学模型ポテンシャル

Outline of Final Research Achievements

Microscopic quantum many-body calculations using realistic two-nucleon interactions have not been able to quantitatively reproduce basic properties of atomic nuclei, such as saturation. Although three-nucleon forces have been supposed to be taken into account, previous studies have had to rely on phenomenological adjustment. Chiral effective field theory, which enables the systematic introduction of three-nucleon forces consistent with its two-nucleon forces, has changed the situation. In this study, I first introduce effective two-body interactions by folding one-nucleon degrees of freedom of the three-nucleon force in nuclear matter, and then investigate their effects in lowest-order Brueckner theory. The description of nuclear saturation properties is shown to be much improved, and in addition the strength of spin-orbit interaction, which is essential for explaining the nuclear shell structure, is enhanced to account for the empirical strength.

Free Research Field

原子核理論