The 14C/12C ratio in 4.8 m3 of high-purity liquid scintillator was measured at (1.94±0.09)×10−18, the lowest 14C abundance ever measured. At this level the spectroscopy of low-energy solar neutrinos, in particular a measurement of the 7Be neutrino flux, will not be obstructed by the 14β decay intrinsic to a liquid scintillator detector. A comprehensive study of the deviation of the shape of the 14β spectrum from the allowed statistical shape reveals consistent results with recent observations and calculations. Possible origins of the 14C in the liquid scintillator are discussed.


Measurement of the 14C abundance in a low-background liquid scintillator
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