New experimental system for measuring composite delayed-neutron spectra following fission

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Abstract

We describe a new experimental approach for measuring composite delayed-neutron spectra as a function of delay time following fission. Fission fragments are transported from the fission chamber to a low background counting room by helium jet and tape transport systems. A β-neutron time-of-flight spectrometer incorporating both 6Li-glass and Pilot U scintillators is used to measure the spectra in the neutron energy range 10–2000 keV. Delay times can be varied from 0.17 s to several minutes. Fission is induced with either thermal or fast neutrons.

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Work supported by the National Science Foundation.

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Present address: Department of Physics, Rochester Institute of Technology, Rochester, NY, USA

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