  The results of an analysis of the invariant mass spectra of photon pairs
produced in dC, pC and dCu interactions at momenta of 2.75, 5.5 and 3.83 GeV/c
per nucleon respectively, are presented. Signals in the form of enhanced
structures at invariant masses of about 17 and 38 MeV/c2 are observed. The
results of testing of the observed signals, including the results of the Monte
Carlo simulation are presented. The test results support the conclusion that
the observed signals are the consequence of detection of the particles with
masses of about 17 and 38 MeV/c2 decaying into a pair of photons.
