Notes sur la musique, essais et chroniques

On the history of dibaryons and their final observation

“…Pion-production in nuclei also has been investigated with respect to possible dibaryon signals. Remarkably, several inclusive experiments conducted at Dubna [120], Saclay [121] and Moscow [122] noted a narrow, only a few MeV broad resonance structure at a mass of about 2220 MeV in proton initiated subthreshold π + production in nuclei, whereas this structure was not observed at TRIUMF in π + and π − production [123] as well as in π 0 production at Saclay [124]. The non-observation in the latter case could have been due to the insufficient energy resolution in that experiment.…”

10.1007/s11450-008-1001-3

“…At the JINR Dubna phasotron, it was found that, at 350-MeV energy, the slope of a pion spectrum at the production angle of 90 • was smaller than was expected from measurements at adjoining energies and the number of low-energy pions was increased. Different investigations of the protoninduced π + production on copper were carried out in order to confirm or reject that result [2][3][4].…”