We give reasons for the existence of the NN decoupled dibaryon resonance
d1∗(1956). Strong evidence for its presence has first been found in the
energy spectrum of coincident photons emitted at ±900 from the pp→γγX process at 216 MeV measured by the DIB2γ collaboration
at JINR. As further experimental indications of the d1∗(1956) existence we
present those found in the available photon energy spectra of npγ,
pdγ, and pAγ reactions below the pion threshold. It is noted that
serious discrepancies between the npγ and pdγ experimental cross
sections and theoretical calculations can reasonably be explained by the fact
that latter did not take into account the d1∗ effect.Comment: 4 pages, LaTex, 4 eps-figures, Talk presented at the XVI
International Conference on Particle and Nuclei (PANIC02), Osaka, Japan, Sep.
30 - Oct. 4, 200