An improved lower limit of >2 ×{} 10³⁰ yr against baryon-conservation-violating nucleon decay has been obtained for modes which produce μ→e decays. The detector, employing a 20-ton large-area (180 m²) liquid scintillator, was operated deep underground (3.2 km) to eliminate stopping muons from cosmic rays, leaving only the background from muons produced by atmospheric neutrinos. A run length of 2.7 yr was required to achieve the sensitivity quoted.
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Reines et al. (1974) studied this question.
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