Abstract
The experimental results are presented for ratios of ν-meson inclusive differential cross sections in 10.5 GeV/ c π +p, π +D and π +A collisions, R D/p=(d σ/d x F)( π + D→ ηX)/ (d σ/d x F ) π +p→ ηX), R A=(d σ/d x F)( π +D→ ηX) in the beam fragmentation region. The results are based on the statistics of ≈ 5 × 10 4 detected η → 2 γ decays. It is shown that the power α in the parametrisation R A ≈ A α( xf) does not change significantly with x F and its mean value is 0.50±0.02. The lower limit is obtained for the effective coefficient with string tension in the colour string model, κ ⩾ 3 GeV/fm. The observed growth of R A with x F can be explained by an assumption of a neutron halo with the factor H ≈ 4 in the nuclei.
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