CONSTRAINTS ON NU(I)-]NU(J)GAMMA FROM MU-]E-GAMMA, TAU-]MU-GAMMA,E-GAMMA

Using the effective Lagrangian approach, we obtain bounds on the lepto n-number-nonconserving decays upsilon(mu) --> upsilon(e) gamma, upsilo n(tau) --> upsilon(mu)gamma, upsilon(e) gamma from the known experimen tal constraints on mu --> e gamma and tau --> mu gamma, e gamma. We ge t a bound on the transition magnetic moment of the muon neutrino kappa (mu e) less than or equal to 1 X 10(-11) for m(upsilon mu) less than o r equal to 270 keV, which improves the bound obtained from astrophysic al considerations. Our results also lead to bounds on the transition m agnetic moments of the tau neutrino.