Characterization of quasi-monoenergetic neutron source using 137, 200, 246 and 389 MeV 7Li(p,n) reactions

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The authors measured the neutron energy spectra of a quasi-monoenergetic 7Li(p,n) neutron source with 137, 200, 246 and 389 MeV protons set at seven angles (0°, 5°, 10°, 15°, 20°, 25° and 30°), using a time-of-flight (TOF) method employing organic scintillators NE213 at the Research Center for Nuclear Physics (RCNP) of Osaka University. The energy spectra of the source neutrons were precisely deduced down to 2 MeV at 0° and 10 MeV at other angles. Neutron energy spectra below 100 MeV at all angles were comparable, but the shapes of the continuum above 150 MeV changed considerably with the angle. In order to consider the correction required to derive the response in the peak region from the measured total response for high-energy neutron monitors, the authors showed the subtractions of H*(10) obtained at larger angles from the 0° data in the continuum part. It was found that subtracting the dose equivalent at larger angles (21° for 389 MeV, 25° for 246 MeV and 26° for 200 MeV) from the 0° data almost eliminates the continuum component. This method has potential to eliminate problems associated with continuum correction for high-energy neutron monitors.

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