New experimental data on cumulative particle production by relativistic nuclei

Cumulative production of π+- and k+-mesons and protons during 8.9 GeV/c momentum proton interaction with 58Ni, 64Ni, 64Zn, 114Sn, 124Sn nuclei was investigated. Measurements were conducted for production of particles with 500 MeV/c momentum and 120 deg observation angle. The obtained data testify to the presence of isotope-effect both for protons and π+-mesons and for k+-mesons. A-dependence of k--meson production cross-sections in pA- and dA-interactions were measured. Kaon momentum was equal to 500 MeV/c, observation angle - 61 deg. A-dependence of cumulative k--meson production is characterized by the same behaviour as A-dependence of cumulative pion production. It was concluded, that cross-section of k--meson production, as well as cross-section of π-meson production, were proportional to quark-parton structure function of the nucleus. Experiment on searching cumulative antiprotons in proton-nucleus interactions on lend and aluminium targets was performed. Primary proton momentum was equal to 8.9 GeV/c. Secondary particle momentum was equal to 500 MeV/c. The detection angle - 61 deg. Cross section of antiproton production was evaluated. New experimental data broaden our knowledge about the processes of cumulative particle production