SONTRAC will measure 20-250 MeV neutrons from solar flares using scintillator fibers viewed by CCD cameras to track neutron-proton scatters. SONTRAC can also be used to track gamma rays above 20 MeV. Veto shields are used to reject all charged particles. Gamma-ray and neutron events have very different track densities, allowing discrimination between the two. Double neutron-proton scatters allow unambiguous determination of the incident neutron energy and direction. Therefore, SONTRAC is capable of rejecting almost all background except neutrons from the solar direction. SONTRAC would have detected the June 15, 1991 flare with 42σ for 20-100 MeV neutrons, having an effective area of 17 cm2 in that energy range. The authors present SONTRAC prototype performance results both forneutrons at threshold energy and for cosmic-ray muons
Space Science Center, Physics
Conference on the High Energy Radiation Background in Space, 1997.
Digital Object Identifier (DOI)
Wunderer, C.B.; Holslin, D.; Macri, J.R.; McConnell, M.; Ryan, J.M., "SONTRAC-a low background, large area solar neutron spectrometer," High Energy Radiation Background in Space, 1997 Conference on the , vol., no., pp.73,76, 22-23 Jul 1997 doi: 10.1109/CHERBS.1997.660251
c 1998 IEEE