Determination of theTc (thermal n, ) Tc Reaction Cross Section from the prompt -Ray Yields

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古高 和禎  ; 原田 秀郎   ; Raman, S.*

Furutaka, Kazuyoshi; Harada, Hideo; Raman, S.*

Tcの基底状態に遷移する即発線の収量からTcの熱中性子捕獲断面積を決定するために、既存の未解析データの解析を行った。線のスペクトルは、円筒形NaI(Tl)検出器内部に同軸型Ge検出器を挿入し、コンプトン抑止モードならびにペアスペクトロメータモードで測定した。夫々の測定モードで得られた線スペクトルのピーク収量解析を行い、約1100本の線データを得ると共に、崩壊図を作成して基底状態への遷移を同定した。この研究では六本の基底状態への遷移を同定し、その収量の和から、反応断面積の下限値が21.370.62bと求まった。

To determine thermal neutron capture cross section ofTc from the yields of prompt rays to the ground state ofTc, analysis of the existing data was done. -ray spectra were obtained with a coaxial intrinsic Ge detector positioned inside a NaI(Tl) annuls which is optically divided into two halves. The Ge detector was operated either in the Compton-Suppressed (CS) or the pair-spectrometer (PS) mode. Peak analysis was done for each ray observed both in the CS and the PS modes. Combining the results of the analyses in both modes, a total of 1100 rays were identified to be originated fromTc. From the obtained data a partial decay scheme was constructed, and six rays were identified as transitions to the ground state. From the intensities of these rays, the lower limit of the cross section is obtained as 21.370.62b.