Shielding experiments by the JASMIN collaboration at Fermilab, 2; Radioactivity measurement induced by secondary particles from the anti-proton production target

Yashima, Hiroshi*; Matsuda, Norihiro  ; Kasugai, Yoshimi  ; Nakashima, Hiroshi; Sakamoto, Yukio; Matsumura, Hiroshi*; Iwase, Hiroshi*; Kinoshita, Norikazu*; Boehnlein, D.*; Lautenschlager, G.*; Leveling, A.*; Mokhov, N.*; Vaziri, K.*; Oishi, Koji*

The experiment was performed at the anti-proton (pbar) production target station in Fermi National Accelerator Laboratory. At the pbar target station, an anti-proton production target, consisted of Inconel and copper disks, were irradiated by 120 GeV proton beam. The beam intensity was 2.0 10 proton per second. Al, Nb, Cu, Au samples were set around the target to investigate the spatial and energy distribution of secondary particles emitted from the target. After irradiation, induced activities of samples were measured by using HPGe detector. The reaction rates of 30 nuclides induced in Al, Nb, Cu, Au samples were obtained. The reaction rates of these nuclides increase for samples placed on forward angle position. The angle dependence of these reaction rates becomes larger for increasing threshold energy. These experimental results compared with the calculation. The calculated results generally agree with the experimental results within a factor of 3.