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A high precision measurement of the υ-meson mass has been performed at the storage ring VEPP-4 using the MD-1 detector. The resonance depolarization method has been used for the absolute calibration of the beam energy that allowed to improve the accuracy of υ-mass measurement by a factor of ten. The following mass value has been obtained: M = 9459.7 ± 0.6 MeV.
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Light ion collisions with carbon target at 4.2 GeV/c/N are studied. Pion multiplicity distributions, momentum and angular spectra are analysed. These data are described in terms of models assuming independent interactions of nucleons from the projectile nucleus with the target.
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NUCLEUS IS THE NUCLEUS OF EMULSION.
NUCLEUS IS THE NUCLEUS OF EMULSION.
NUCLEUS IS THE NUCLEUS OF EMULSION.
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Axis error includes +- 2/2 contribution (Error in counter efficiency determination).
Electron momentum distribution.
Electron-positron pairs mass distribution.
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