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3 H̃e nuclei were observed in the negative beam, produced by 70 GeV protons on an Al target. Five 3 H̃e have been identified among 2.4 · 10 11 particles that passed through the apparatus. Scintillation and Čerenkov counters were used to measure the electrical charge and velocity of particles. The mass of 3 H̃e is found to be M 3 H ̃ e = (1.00 ± 0.03)3m p , the charge is z = (0.99 ± 0.03)2 e . The ratio of differential production cross sections of 3 H ̃ e (P = 20 GeV /c) and π − (P = 10 GeV/c ) equals 2 · 10 −11 . This corresponds to antihelium −3 production cross section d 2 σ 3 H ̃ e / d Ω d P = 2.0 · 10 −35 cm 2 / sr · GeV /c per Al nuclei and 2.2 · 10 −36 cm 2 sr · GeV/ c per nucleon.

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CM Energies (GeV)

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Experimental Study of $K^0$ Meson Inclusive Production in the $K^+$ a Interaction at 11.2-{GeV}

Measurement of inclusive cross sections for production of cumulative protons in pi-, K-, and anti-p interactions in Be at 40-GeV/c.

LOW-ENERGY HADRON PRODUCTION AT ZERO ANGLE IN PROTON - NUCLEUS COLLISIONS AT 70-GeV

Study of $\rho^0$ and $\omega$ Meson Inclusive Production by 43-{GeV}/$c \pi^-$ Mesons Off Be Nuclei

Observation of antihelium-3