Study on pairing correlations in neutron-rich unstable nuclei within nuclear density functional theory

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K03964
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
• Research Institution: University of Tsukuba
• Principal Investigator: Hinohara Nobuo 筑波大学, 計算科学研究センター, 助教 (80511435)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 不安定核 / 対回転 / 原子核密度汎関数法 / 対相関

Outline of Final Research Achievements

We have studied the nuclear pairing correlation in a wide range of the nuclear chart based on the nuclear density functional theory. The nuclear pairing correlation has been conventionally analyzed using the odd-even mass staggering. We have shown that various experimental observables such as the pairing rotational moment of inertia, the charge radius, and the alpha-removal amplitude of the alpha-knockout reaction correlate with the pair energy density functional (EDF). In addition to the standard spin-singlet pair EDFs, we have also performed analyses using other types of pair EDFs such as the Fayans EDF and the spin-triplet one. We have shown that it is possible to determine the form of the pair EDF by using various experimental observables.

Free Research Field

原子核理論

Academic Significance and Societal Importance of the Research Achievements

原子核対相関は原子核基底状態での最も基本的な相関の一つであり、多くの原子核は基底状態で核子対が凝縮していると考えられている。質量の偶奇性を用いた従来の議論だけでは対密度汎関数の形を決定することができず、これまで対相関の理解に大きな進展が見られていなかった。本研究により様々な実験観測量に対相関の影響が強く見えることが明らかとなった。この成果は対密度汎関数のさらなる理解につながり、将来の対密度汎関数の決定にも貢献できる。