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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.*

$$^{99}$$Tc の熱中性子捕獲断面積を決定するため、反応で放出される即発$$gamma$$線の解析を行った。得られたデータから、36の準位と88本の$$gamma$$線からなる部分崩壊図を作成した。6本の$$gamma$$線が基底状態への遷移であることがわかった。基底状態への遷移の強度の和から、反応の断面積の下限値が21.37$$pm$$0.68bと求まった。準位のエネルギーの最小自乗法によるフィットから、$$^{100}$$Tcの中性子分離エネルギーが6765.20$$pm$$0.04keVと求まった。$$^{100}$$Tcがベータ・マイナス崩壊して生成する$$^{100}$$Ru核の$$gamma$$線の解析も行い、これからは熱中性子捕獲断面積が22.8$$pm$$1.8bと求まった。

Analyses were made of the prompt $$gamma$$ rays emitted in the thermal neutron capture reaction by $$^{99}$$Tc to determine the reaction cross section. From the obtained data, a partial decay scheme was constructed which consists of 88 $$gamma$$ rays and 36 bound states. Six $$gamma$$ rays were assigned as the transitions to the ground state of $$^{100}$$Tc. From the intensities of these six $$gamma$$ rays, a lower limit of the reaction cross section was obtained to be 21.37$$pm$$0.68b. Through a least-squres fit to the level energies, the neutron separation energy of $$^{100}$$Tc was determined as 6765.20$$pm$$0.04 keV. $$gamma$$ rays in $$^{100}$$Ru emitted following the beta- decay of the reaction product $$^{100}$$Tc were also analyzed. The inferred cross section is 22.8$$pm$$1.8b.

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