Resonances in the System of Pi+Pi- -- Mesons from the Reaction np->npPi+Pi- at Pn=5.20GeV/c: Search, Results of Direct Observations, Interpretation

10 resonances were found in the mass spectrum of p p -system based on 66075 events from the reaction np in np -interactions at in the 1-m HBC of LHE JINR by using the criterion These masses are the following: (347 – 12), (418 6), (511 12), (610 5), (678 17), (757 5), (880 12), (987 12), (1133 15), and (1285 – 22) MeV/c 2 ; their excess above background is 2.9, 5.2, 3.5, 1.4, 2.0, 8.5, 4.8, 3.8, 5.2, and 6.0 S.D., respectively. The experimental widths of the resonances vary within the region from 16 to 94 MeV/? 2 . Such effects were not found in 0 p p --combinations from the reaction Therefore, it is necessary to attribute the value of isotopic spin I = 0 to the resonances found in the mass spectrum of the - + p p -system. The spin was estimated for the most statistically provided resonances at masses of 418, 511 and 757 MeV/? 2 . We determine with a high degree of confidence that J = 0 for the resonances