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Shielding experiments at high energy accelerators of Fermilab, 2; Spatial distribution measurement of reaction rate behind the shield and its application for Moyer model

フェルミ国立加速器研究所の高エネルギー加速器を用いた遮蔽実験,2; 遮蔽体後方における反応率の空間分布測定及びMoyerモデルへの適用

八島 浩*; 春日井 好己; 松田 規宏; 松村 宏*; 岩瀬 広*; 木下 哲一*; Mokhov, N.*; Leveling, A.*; Boehnlein, D.*; Vaziri, K.*; Gary, L.*; Wayne, S.*; 中村 尚司*; 大石 晃嗣*; 平山 英夫*; 石橋 健二*; 中島 宏; 坂本 幸夫; Members of JASMIN corroboration*

Yashima, Hiroshi*; Kasugai, Yoshimi; Matsuda, Norihiro; Matsumura, Hiroshi*; Iwase, Hiroshi*; Kinoshita, Norikazu*; Mokhov, N.*; Leveling, A.*; Boehnlein, D.*; Vaziri, K.*; Gary, L.*; Wayne, S.*; Nakamura, Takashi*; Oishi, Koji*; Hirayama, Hideo*; Ishibashi, Kenji*; Nakashima, Hiroshi; Sakamoto, Yukio; Members of JASMIN corroboration*

フェルミ国立加速器研究所の反陽子ターゲットステーションにおいて、放射化試料を使用した遮蔽実験を行い、照射後の残留放射能をGe検出器で測定した。反応率の空間分布は、反陽子ターゲットステーションを構成する鉄遮蔽体及びコンクリート遮蔽体の背後に設置した試料による放射能の結果から得られた。得られた反応率はターゲットの下流に向かって上昇する分布を有しており、高エネルギー加速器施設の遮へい設計によく用いられるMoyerの式と一致した。さらに、この結果から鉄及びコンクリートにおける中性子の減弱距離が得られた。

The shielding experiment was performed at the anti-proton production target station in Fermi National Accelerator Laboratory. Aluminum, Bismath, Niobium, Copper and Indium samples were placed behind the shields. After irradiation, induced activities of samples were measured by using HPGe detector. The spatial distribution of reaction rate of samples which were placed behind the iron and concrete shields were obtained. The measured data shows that the reaction rates on the outer surfaces of the iron and concrete shields increases toward the downstream of the target. The obtained reaction rates were also fitted to Moyer's formula, and the attenuation lengths for iron and concrete shields were obtained.

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