Abstract
The lower limit was measured for the lifetime of nucleons against spontaneous decay by processes which do not conserve the number of nucleons. The decay modes release charged particles with energies generally above 100 Mev. Possible decay events were sought using a 200liter liquid scintillation detector. Backgrounds were due entirely to cosmic rays reduced by going 585 m underground and surrounding the scintillation detector by a water Cherenkov anticoincidence counter of over-all dimensions 2.4 m in diameter and 2.0 m high. The sclntillation detector was set do detect pulses as low in energy as 8 Mev and hence was sensitive to a wider variety of decay events than previous experiments. Lifetime limits obtained range from 10/sup 26/ to 7 x 10/sup 27/ years depending on the decay mode assumed. (auth)
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