Abstract
An experimental arrangement designed for the study of π 0-photoproduction on the nuclei of helium gas at small momentum transfers (the kinetic energy of the recoil nuclei T α kim = 1–20 MeV) is described. The arrangement consists of a recoil nucleus detector which is a self-triggering helium spark chamber and a π 0-meson detector which is a combination of total absorption Cherenkov spectrometers, wide gap spark chambers and scintillation counters. By this arrangement the reaction γ+ 4He→ 4He+ π 0 has been investigated and for the energy interval E γ = 1.5–4.5 GeV a value of the cross section has been obtained integrated over the angular interval θ π 0 lab = 2°–8° equal to (0.28±0.02) μb (statistical errors).
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