Cross sections for a new nuclear reaction channel on 197Au with a bound dineutron in the outgoing channel.

A new nuclear reaction channel on 197Au with neutron in the incident channel and a bound dineutron (2n) in the output channel is considered based on available experimental observations. The dineutron is assumed to be formed as a particle-satellite, separated from the volume but not from the potential well of 196Au residual nucleus provided the energy of incident neutron is about 2 MeV below the threshold of corresponding (n,2n) reaction. The dineutron was identified by statistically significant radioactivity detection due to decay of 196gAu nuclei. Cross sections for the 197Au (n,2n) 196gAu reaction are determined as 180 +/- 60 microbarns and 37 +/- 8 microbarns for [6.09-6.39] MeV and [6.175-6.455] MeV energy ranges, correspondingly.