Deuteron breakup at zero angle in the Coulomb nuclear field

Deuteron breakup cross sections on the C and CH2 targets have been measured up to the proton internal momenta of 0.3 GeV/c. The cross-sections 12C(d, p)X and 1H(d, p)X reactions have been obtained with high precision. The obtained data are compared with previous measurements. The behavior features in the vicinity of the cross section maximum were studied in dependence on the transversal momentum in the region of 0.01 < pt < 0.16 GeV/c. The measurements have been performed at the Veksler Baldin Laboratory of High Energy Physics of the Joint Institute for Nuclear Research.

FCC-ee and the CR effects

The proposed new FCC-ee e+e– colliders will be hosted in the Geneva area as the new 100 km tunnel will allow producing collisions at centre-of-mass energies from 90 to 350 GeV and beyond at several interaction points and will be used for a precision measurement at the Z pole, WW threshold, HZ cross section maximum and tt̅ threshold with an unequaled accuracy. New measurements, which will be realized with large amount of data and at high energies accessible at the FCC-ee would allow a detailed study of the Color Reconnection phenomenon, especially in the hadronic WW decays, and would be helpful for other studies, for example in search for these effects in tt̅ and in Higgs decays.

Interfacial Stresses for Bonded Rubber Blocks in Compression and Shear

When a rubber block is compressed between two rigid surfaces, to which it is bonded, both compressive and shear stresses are set up at the interfaces. These interfacial stresses have been measured for small compressions of four relatively-thin, flat rubber blocks of square and circular cross section. Maximum compressive stresses, nearly twice the average value, were developed in the center of the bonded surfaces. Shear stresses were found to increase continuously from zero at the center to maximum values at the edges. No evidence was detected of a singularity at the edges. For all of the blocks examined, the observed stress distributions agreed satisfactorily with theoretical predictions based on incompressibility of the rubber and a simple superposition of two deformation states. Measurements were also made of the shear stress distribution associated with an overall shear displacement of the block.

A measurement of the ionization cross-section of helium ions by electron impact

An apparatus, based on the crossed-beam principle, is described for measuring the ionization cross-section of ions by electron impact. The cross-section for the reaction He + + e → He 2+ + 2 e is determined from the threshold at 54.4 to 1000 eV. The results are compared with the ionization cross-section of atomic hydrogen and with theory. The He + cross-section, when scaled by the appropriate factor, is very similar to that of atomic hydrogen but increases more rapidly in the neighbourhood of the threshold. At the highest electron energies the cross-section agrees well with that predicted by the Coulomb-Born approximation but is considerably lower at the cross-section maximum. For electron energies above 150 eV the error in the measurement is estimated to be less than ± 10% .