LOOKING FOR Pu ~ Pr OSCILLATIONS

Interest in neutrino oscillations [ 1 ] has recently been revived [2] in connection with reactor neutrino resuits [3], the/a/e puzzle in beam dump experiments [4], solar neutrino flux measurements [5"] and indications in favour of a non-zero mass of the electron neutrino [6]. In the simplest case of two "mass" neutrinos mixed into two "current" neutrinos with angle t~ the transition between the "current" neutrinos occurs with a probability