EAS longitudinal development distribution parameters for different extrapolations of the nuclei intaraction cross section to the very high energy domain

Determination of the primary particle mass using air fluorescence or a Cherenkov detector array is one of the most difficult task of experimental cosmic ray studies. The information about the primary particle mass is a compound of the produced particle multiplicity, inelasticity, interaction cross-section and many other parameters, thus it is necessary to compare registered showers with sophisticated Monte-Carlo simulation results. In this work we present results of the studies of at least three possible ways of extrapolating proton- Nucleus and Nucleus-Nucleus cross sections to cosmic ray energies based on the Glauber theory. They are compared with experimental accelerator and cosmic ray data for the proton-air cross section. We also present results of the EAS development with the most popular high-energy interaction models adopted in the CORSIKA program with our cross section extrapolations. The average position of the shower maximum and the width of its distribution are compared with experimental data and some discussion is given.

Search for time-reversal-invariance violation in double polarized antiproton-deuteron scattering

Apart from the pd reaction also the scattering of antiprotons with transversal polarization PPY on deuterons with tensor polarization Pxz provides a null-test signal for time-reversal-invariance violating but parity conserving effects. Assuming that the time-reversal-invariance violating N̅N interaction contains the same operator structure as the NN interaction, we discuss the energy dependence of the null-test signal in p̅d scattering on the basis of a calculation within the spin-dependent Glauber theory at beam energies of 50-300 MeV.

Test of Time-Reversal Symmetry in the Proton-Deuteron Scattering

The integrated cross section [Formula: see text] for a special type of double polarized proton-deuteron scattering constitutes a null test for time-invariance violating but P-parity conserving effects. Using Glauber theory for the [Formula: see text] elastic scattering and different types of phenomenological T-odd P-even NN-interactions we show that the contribution of the lowest mass meson exchange, i.e. the [Formula: see text]-meson, to the null-test signal [Formula: see text] vanishes. Variation of the cross section [Formula: see text] due to strong hadronic and Coulomb interaction is studied and its energy dependence is calculated in the GeV region.