Antineutrino Detection for Monitoring Nuclear Explosions

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The rate of such events in each module is given by: Npm 14) R :Cc = z N! “=N F (O(N~~ + + ~pMT = 200 ns + NPMT = 16200 + >25 (2 MeV) + :*. A XnX(k)n(TPm )“-l;AT <<1 – Ii)! the background rate per tube the time gate the number of tubes in a single module the number of struck phototubes the ~~mum number of photoelectrons required for a trigger This series (which is dominated by its first few terms) can be solved for ~ to give a maximum acceptable dark current rate per tube. The rate decreases with detector range since the overall acceptable noise rate per module decreases.

Raghavan, S. Schoene@ S. Enomoto, J. Shirai, F. Suekane, A. Suzuki, “Measuring the Global Radioactivity in the Earth by Muhidetector Antineutrino Spectroscopy;’ Phys. Rev. Lett. Vol. 80, Number 3, p. 635, (1998). 18C. Rothschild, M. Chen, F. gov/abs/nucl-ex/9710001, Submitted to Geophysical Research Letters, 15 Oct. 1997. r. Underground. 19M. , “Neutron Flux Generated by Cosrn&Ray Depth Intensity Curve;’ R Nuovo Cimento, Vol. 12 C. N. 4, July-August 1989, p. 467. H. Chen, ‘The Sudbury Neutrino Observatory:’ Nuclear Instruments and Methods in Physics Research A264, p.

Contributions from surrounding rock are built up by summing the thin shells out to 1 m. To obtain a rateYa differential flux through a patch on the fiducial surface is obtained by numerically integrating the quantity: 47CX2 over the outer shell, with ~ the attenuation length for 3 MeV photons. Figure 8 shows the geometry and the definition of the integration variable x. x extends over the range: t

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