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Report No.

Measurements and analyses of the distribution of the radioactivity induced by the secondary neutrons produced by 17-MeV protons in compact cyclotron facility

Matsuda, Norihiro ; Izumi, Yuichi*; Yamanaka, Yoshiyuki*; Gando, Toshiyuki*; Yamada, Masaaki*; Oishi, Koji*

Measurements of reaction rate distributions of secondary neutrons produced by 17-MeV protons were conducted at a compact cyclotron facility with the foil activation method. The experimentally obtained distribution suggests that the target and the deflector as components of the cyclotron are principal beam loss points. The experimental data are compared with the results by the Monte Carlo simulation. The calculated results from the deflector based on the assumption of the beam loss rates were about 3 times higher than the experimental ones. This result implies that the overestimation may results from indeterminate beam loss rates at the deflector.



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