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Using irradiation of a 1-meter Hydrogen Bubble Chamber (LHE JINR) by aquasimonochromatic neutron beam with impulse Pn=(5.20 +/- 0.12)GeV/c producedafter acceleration of deuterons in the synchrophasotron (LHE JINR) 2560 eventsof reaction np-->npPi+Pi- were selected. After supplementary sorting out theevents where a secondary proton flies forward in the general c.m.s. of reactionin the effective mass spectrum of Pi+Pi- - combinations, there were ninepeculiarities found out at masses 350, 408, 489, 579, 676, 762, 878, 1036, 1170MeV/c^2 with experimental widths not more than several tens of MeV/c^2. Theresonance effects grow too much after using an additional criterion - balanceof the sum of the longitudinal impulse of Pi+ and Pi--mesons in the generalc.m.s. of the reaction. Under these conditions the values of a standardderivation from the background are (5 - 7.5). The direct measurement of thespin of resonances was carried out. Also other quantum numbers were obtained.All of these peculiarities have a similar set of quantum numbersI^G(J^(PC))=0+(0++). This way the sequence of scalar-izoscalar resonancesf0(SIGMA0) with masses in the range of M<M1200 MeV/c^2 are to be seen. There isno information about these resonances in the literature. The phenomenologicaldependence for the resonance mass from its number was found. This dependencecovered not only resonances shown in this paper but also all those which arepresent in PDG tables with quantum numbers f0(SIGMA0) - mesons.

The Search and Study of Low-Mass Scalar Mesons in the Reaction np --> np Pi+Pi- at Pn = 5.20 Gev/c^2