Signal of the rare radiative decay phi --> eta pi(0)gamma was observed
in the SND experiment at VEPP-2M electron-positron collider. The resu
lt is based on the analysis of data, corresponding to a total integrat
ed luminosity of 4 pb(-1), or 8 . 10(6) phi-mesons produced. The measu
red branching ratio of phi --> eta pi(0)gamma decay is equal to (0.83
+/- 0.23) . 10(-4). (C) 1998 Published by Elsevier Science B.V. All ri
ghts reserved.