INTERFERENCE EFFECTS IN THE DECAY OF RESONANCE STATES IN
THREE-BODY COULOMB SYSTEMS

Oleg  I. Tolstikhin,^1 Inga Yu. Tolstikhina,^2
and Chusei Namba^3

^1 The Russian Research Center ``Kurchatov Institute'',
Kurchatov sq. 1, Moscow, 123182, Russia
^2 P.~N.~Lebedev Physical Institute,
Leninsky Prospect 53, Moscow, 117924, Russia
^3 National Institute for Fusion Science,
Toki, 509-52, Japan


Results of a systematic study of the lowest $^1S^e$ Feshbach
resonance in symmetric three-body Coulomb systems are reported.
We found that the resonance width oscillates as a function
of the mass-ratio of the constituting particles and maybe even
vanishes at certain values this parameter. These oscillations are
interpreted as a result of the interference between two different
paths of the resonance decay.