Neutral-Current Limit and Future Prospect at a Fission Reactor

Abstract

Data are presented which yield a new upper limit for the weak neutral- current reaction ${\overline{\nu }}_e+d\to n+p+{\overline{\nu }}_e$ in the MeV range of 6 times theoretical expectation at a 3-standard-deviation level. These data also demonstrate the feasibility of a test which is an order of magnitude more sensitive.