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The 4Hep interactions at 2.7 GeV/c and 5 GeV/c initial momenta ofalpha-particles are investigated using the 2m liquid hydrogen bubble chamber(the kinetic energies of the initial protons in the nuclear rest frame were Tp= 220 MeV and 620 MeV). The effective mass spectrum of two nucleons from thereactions 4Hep -> dppn and 4Hep -> pppnn was analysed. The narrow structure inthe 2p mass spectrum from the quasi-elastic reaction p4He ->nF(pp)d at Tp = 620MeV (where nF is the fast neutron in the nuclear rest frame) was found which isthe evidence of the existence of dibaryon with a mass M2p = 2008 +- 13 MeV anda width Gamma = 20 +- 5 MeV.Comment: 10 pages, 4 Postscript figures, uses article.st

Search for dibaryon production in 4Hep interactions at intermediate energies