Nuovo Cim.A

The excitation functions of differential cross-sections in pion-nucleus scattering at intermediate energies have been obtained by fitting in the c.m.s. with Legendre polynomials all the existing data on1H,2H,3He,4He,12C and16O. The spectra have been deduced by calculating the maximum-likelihood Lorentz lines through a Monte Carlo method. Among the main features, we find a resonant behaviour of the excitation functions at energies much lower compared to the free Δ-resonance position. The shift is angle dependent andA-dependent. A possible explanation of the downward energy shift is given on the ground of the recent developments of the collective isobaric resonance model.

Phys.Lett.B

The differential cross section for the backward emission of fast protons of energies from 50 to 145 MeV has been measured in coincidence with forward outgoing protons (255 to 330 MeV) in proton - nucleus interactions by a scintillation counter method. The experimental conditions correspond to the kinematics of the quasi-free scattering of incident protons on two nucleons within the target nucleus. The results are compared with the predictions of several models describing backward fast proton emission.

Phys.Lett.B

Results of a search for prompt neutrinos in a beam-dump experiment with 70 GeV protons are reported. The observed rate is ν pr / π = (2.7 ± 2.2) × 10 −5 for mean neutrino energy 〈 E ν 〉 ≈ 5 GeV. An estimation on charmed meson production as a possible source of prompt neutrinos is given. Production rate of the axion relative to π 0 mesons is found to be less than 6 × 10 −9 (95% C . L .).

Phys.Lett.B

Charged current data of a spark chamber neutrino experiment at the 70 GeV Serpukhov accelerator (10 200 events in the v beam and 3600 events in the v beam with energies up to 30 GeV) have been analyzed. Total neutrino and antineutrino cross sections and v -distributions are obtained.