Influence of channeling on scattering of low-energy antiprotons transmitted through thin crystalsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A computer simulation study of the transmission of low-energy antiprotons through a thin single crystal, along one of the axial directions, is reported. The angular distribution of the scattered antiprotons behind the crystal is analysed. As an example the scattering of 300 keV antiprotons moving along the [110] axis in 500 Angstrom and 2000 Angstrom thick silicon crystal is considered. The results of the calculation show the formation of the ring-shaped patterns (doughnuts) for the incident angles of the order of the critical angle for channeling. A comparison of the angular distribution of antiprotons with that of protons is made. It is shown that the randomization of the transverse momentum is much quicker for antiprotons than for protons, which leads to a more uniform azimuthal angular distribution. The blocking effect in the transverse plane, known for protons, is not found for antiprotons. The influence of the doughnut distribution on the results of the transmission experiments with small acceptance angle detectors is discussed.