Abstract
A fast (keV) neutron is a unique probe for studying important problems on nuclear astrophysics as well as on nuclear physics, and the neutron is produced by several reactions such as nucleon exchange reaction, photo-nuclear reaction, and spallation reaction. Among the neutrons produced by these reactions the spallation neutron has characteristic features such as a white energy spectrum and a well collimated beam. In this study, the neutron flux of the spallation neutron source (KENS) was measured from thermal energy to 90 keV: the flux at 30 keV is about 12 n/(cm 2 s eV) at a sample position 7.34 m from the water moderator for the proton beam current of 5 μA, comparable to the flux obtained by the 7Li(p, n) 7Be reaction for the proton beam current of 10 μA at a sample position 12 cm from the 7 Li target. The measured flux was compared to a calculated one using a Monte-Carlo code.
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