1982 年 19 巻 10 号 p. 821-830
Photo-neutron emission in H2 and He discharges was observed in the initial ohmic heating experiments of the Heliotron-E. Typical total neutron yield was 109 neutrons per pulse under high level of runaway electrons ( ?? 10 MeV). Neutron flux was localized near the limiters. Energy spectrum of neutrons was continuous up to about 2 MeV. The radioactive nuclides in the limiters and the vacuum chamber irradiated by runaway electrons showed that 58Ni (r, n) 57Ni and 53Cr (r, n) 51Cr reactions had occurred, proving that the photodisintegration process was the source of neutron flux.
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