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Determination of the$$^{99}$$Tc (thermal n, $$gamma$$) $$^{100}$$Tc Reaction Cross Section from the prompt $$gamma$$-Ray Yields

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古高 和禎; 原田 秀郎 ; Raman, S.*

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

$$^{100}$$Tcの基底状態に遷移する即発$$gamma$$線の収量から$$^{99}$$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。$$gamma$$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$$gamma$$線スペクトルのピーク収量解析を行い、約1100本の$$gamma$$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$$gamma$$遷移を同定し、その収量の和から、反応断面積の下限値が21.37$$pm$$0.62bと求まった。

To determine thermal neutron capture cross section of$$^{99}$$Tc from the yields of prompt $$gamma$$ rays to the ground state of$$^{100}$$Tc, analysis of the existing data was done. $$gamma$$-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 $$gamma$$ ray observed both in the CS and the PS modes. Combining the results of the analyses in both modes, a total of 1100 $$gamma$$ rays were identified to be originated from$$^{100}$$Tc. From the obtained data a partial decay scheme was constructed, and six $$gamma$$ rays were identified as transitions to the ground state. From the intensities of these $$gamma$$ rays, the lower limit of the cross section is obtained as 21.37$$pm$$0.62b.

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