Search for Free Decay of Negative Pions in Water and Light Materials
Abstract
We report on a search for the free decay component of pi- stopped in water and light materials. A non-zero value of this would be an indication of anomalous nue contamination to the nue and numubar production at stopped-pion neutrino facilities. No free decay component of pi- was observed in water, Beryllium, and Aluminum, for which upper limits were established at 8.2E-4, 3.2E-3, and 7.7E-3, respectively.
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