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Previous work showed that the 3He(n,tp) reaction in a cell of 3He atatmospheric pressure generated tens of far-ultraviolet photons per reactedneutron. Here we report amplification of that signal by factors of 1000 andmore when noble gases are added to the cell. Calibrated filter-detectormeasurements show that this large signal is due to noble-gas excimer emissions,and that the nuclear reaction energy is converted to far-ultraviolet radiationwith efficiencies of up to 30%. The results have been placed on an absolutescale through calibrations at the NIST SURF III synchrotron. They suggestpossibilities for high-efficiency neutron detectors as an alternative toexisting proportional counters.

Far-ultraviolet signatures of the 3He(n,tp) reaction in noble gas mixtures