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Neutron and $$gamma$$-ray streaming experiments at the fast neutron source reactor "YAYOI"

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岡 芳明*; Yanagisawa, Ichiro*; Akiyama, Masatsugu*; An, Shigehiro*

Oka, Yoshiaki*; Yanagisawa, Ichiro*; Akiyama, Masatsugu*; An, Shigehiro*

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Neutron and $$gamma$$ ray streaming experiments were per-formed in the ducts and caivities that were located in theheavy concrete shields of the fast neutron source reactorYAYOI of University of Tokyo. The configurations have thefeature that the streaming through the ducts are occurredfollowing the scattering in the cavity. The axes of theducts are perpendicular to the source radiation from thecore. The spectrum of the source was modified by puttinga plug in the beam hole of the core. An aluminum plug andthe plug which contains paraffin were used. The decay inthe ducts,however,hardly depends on the source spectrum.The decay in the ducts is nearly exponential.

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