Antineutrinos from nuclear reactors can be used for monitoring in the mid- to
far-field as part of a non-proliferation toolkit. Antineutrinos are an
unshieldable signal and carry information about the reactor core and the
distance they travel.
Using gadolinium-doped water Cherenkov detectors for this purpose has been
previously proposed alongside rate-only analyses. As antineutrinos carry
information about their distance of travel in their energy spectrum, the
analyses can be extended to a spectral analysis to gain more knowledge about
the detected core.
Two complementary analyses are used to evaluate the distance between a
proposed gadolinium-doped water-based liquid scintillator detector and a
detected nuclear reactor. Example cases are shown for a detector in Boulby
Mine, near the Boulby Underground Laboratory in the UK, and six reactor sites
in the UK and France. The analyses both show strong potential to range
reactors, but are limited by the detector design.Comment: 12 pages, 9 figure