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FOR PI- MESON: THETA(RF=LAB)=<75 DEGREE.
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THE CARBON THICKNESS 4.9 G/CM**2.
THE CARBON THICKNESS 19.4 G/CM**2.
THE CARBON THICKNESS 36.5 G/CM**2.
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THE MOMENTUM OF EACH INCIDENT PION WAS DETERMINED WITH AN ACCURACY 0.2 PCT.
THE MOMENTUM OF EACH INCIDENT PION WAS DETERMINED WITH AN ACCURACY 0.2 PCT.
THE MOMENTUM OF EACH INCIDENT PION WAS DETERMINED WITH AN ACCURACY 0.2 PCT.
The results of the measurements of antiproton-nuclei annihilation cross-sections at the momentum range from 0.70 to 2.50 GeV/ c are presented. The A -dependence of the cross-sections is described by the formula σ 0 A α . The behavior of the parameters σ 0 and α indicates the possibility of Coulomb influence on the annihilation processes at low momenta. Comparison with the Glauber theory is carried out. The Coulomb corrections to the Glauber formula for the absorption cross-sections of hadrons by nuclei are calculated. The influence of the real part of the nuclear potential is taken into account. Calculations are made in the frame of the high-energy approach. A comparison with data of annihilation cross-sections of antiprotons on nuclei is made.
DETECTOR OF ANNIHILATION COLLECTS 75 PCT OF GENERATED PARTICLES. THE PION BACKGROUND IN THE BEAM WAS NOT GREATER THEN 3-4 PCT (FOR 1.76 GEVABOUT 2 PCT).
DETECTOR OF ANNIHILATION COLLECTS 75 PCT OF GENERATED PARTICLES. THE PION BACKGROUND IN THE BEAM WAS NOT GREATER THEN 3-4 PCT (FOR 1.76 GEVABOUT 2 PCT).
DETECTOR OF ANNIHILATION COLLECTS 75 PCT OF GENERATED PARTICLES. THE PION BACKGROUND IN THE BEAM WAS NOT GREATER THEN 3-4 PCT (FOR 1.76 GEVABOUT 2 PCT).
From the analysis of 5630 v υ and of 1372 v π charged current interactions, obtained in the BEBC bubble chamber filled with deuterium and exposed to the CERN wide band antineutrino beam, the ratios of cross section on neutron and photon targets have been measured and found to be R σ ν)/σ v p = 0.51 ± 0.01 (±0.03) , and R σ( ν n )/σ( v p ) = 22.2 ± 0.12 (±0.25) The dependence of these ratios on the x scaling variable shows, in a direct way, that the momentum distribution of the majority quark, u p ( x ) = d n ( x ), is broader than that of the minority quark, u n ( x ) = d p ( x ).
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THE RESONANCE PARAMETERS: MASS=1437 +-3 MEV, WIDTH=169 +-2 MEV.
THE RESONANCE PARAMETERS: MASS=1418 +-3 MEV, WIDTH=60 +-5 MEV.
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