Verification of R-matrix calculations for charged-particle reactions in the resolved resonance region for the Be system

荷電粒子入射共鳴核反応に対するR行列理論計算コードのBe複合核を対象とした比較検証

Thompson, I. J.*; deBoer, R. J.*; Dimitriou, P.*; 国枝 賢  ; Pigni, M. T.*; Arbanas, G.*; Leeb, H.*; Srdinko, Th.*; Hale, G.*; Tamagno, P.*; Archier, P.*

Thompson, I. J.*; deBoer, R. J.*; Dimitriou, P.*; Kunieda, Satoshi; Pigni, M. T.*; Arbanas, G.*; Leeb, H.*; Srdinko, Th.*; Hale, G.*; Tamagno, P.*; Archier, P.*

各国の代表的なR行列理論共鳴解析コード(AMUR, AZURE2, CONRAD, EDA, FRESCO, GECCCOSおよびSAMMY)による計算結果の比較や検証を世界で初めて実施した。本研究では複合核Beを例にとり、同一の共鳴パラメータセットを用いて、種々の荷電粒子入射反応断面積や微分断面積の計算結果を比較した。その結果、クローン波動関数の計算における近似法の違い等により各国コードによる計算値には差異が見られるものの、全ての計算結果は0.3%以内で一致することを明らかにした。

In this paper we present, for the first time, the results of a comprehensive effort to verify the most widely used R-matrix codes in the various fields of nuclear science and applications: AMUR, AZURE2, CONRAD, EDA, FRESCO, GECCCOS, and SAMMY. In addition to the description of the capabilities of the codes and their specifications, we discuss the results of a joint exercise which was coordinated by the International Atomic Energy Agency. The aim of the exercise was to compare calculations of charged-particle reaction cross sections for the light composite system Be. The calculations were performed by the codes using identical input R-matrix parameters and other specifications and were limited to charged-particle channels.