[en] The interaction mean free path is determined of nuclei with the atomic number between 10 and 30 and energy greater than 1.5 GeV per nucleon in a nuclear emulsion block. The mean free path of interaction per one nucleon was found to be 22.9+-1.8 cm and 235+-6.6 cm for primary and secondary nuclei, respectively. The emulsions were irradiated on board the Interkosmos 6 satellite. (S.P.)

[en] A method for the determination of mercury, arsenic and selenium by neutron activation analysis is described. Radiochemical separations are performed by selective distillation followed by electrolysis of mercury on gold and precipitation of arsenic and/or selenium by reduction to the elemental form. The chemical yields are 80-90% for mercury and 90-100% for arsenic and selenium. Interference tests were carried out with reference to those elements most likely to interfere with the analysis. Detection limits for mercury, arsenic and selenium using 0.1 g of sample are 0.2 ng gsup(-1), 2 ng gsup(-1) and 3 ng gsup(-1), respectively. Detection limits can be improved using larger sample size and neutron flux density. Results from the analysis of several NBS standard reference materials are given. (author)

[en] A satellite emulsion experiment is described with the study of the chemical composition of primary cosmic radiation. In the analysis, nuclei with Z>10 and kinetic energy Esub(k)>1.8 GeV/nucleon were considered. The measured chemical composition slightly differs from the known composition. A significant increase in Fe-group nuclei was observed. The results show a considerable spallation of the Fe-group nuclei and probably also of heavier cosmic radiation nuclei in material placed on top of the nuclear emulsion. (Z.J.)

[en] Basic experimental data are presented on the mean free path, parameter of fragmentation and on angular distribution in the interactions of ⁸⁴Kr nuclei of 1.3 GeV/nucl. The mean free path for the inelastic collisions ⁸⁴Kr+Em obtained is in good agreement with earlier published data on exposure of emulsions by ions. The increase of number of fragments with increasing mass of primary nucleus is observed. (R.P.) 9 refs.; 2 figs.; 2 tabs

[en] A brief survey is presented of the current state of the study of cosmic particles and of certain possibilities of the development of experiments which would contribute to the advance of this discipline. The selection of experiments cited is influenced by the work of Czechoslovak physicists who are in the research of energetic cosmic particles. (Z.J.)

No abstract available

[en] The results are given of a study of the scattering of atomic nuclei on atomic nuclei at superhigh energies (E>=10¹²eV). The equipment used was placed on board the Interkosmos 6 satellite; cosmic radiation was the source of high-energy nuclei. It is shown that for the case of the interaction of two nuclei having totally N nucleons the law of simple superposition of the interaction of N independent nucleons no longer applies. (I.W.)

[en] The work presented was carried out using experimental material obtained by irradiating emulsions onboard the Intercosmos-6 satellite. Fragmentation parameters were determined in a large statistical set, especially for light and heavy nuclei of the photoemulsion. The energy of incident nuclei was found to be higher then 2 GeV/nucl. A comparison of the results with those published by other authors is given. (author)

No abstract available

[en] Data on fluxes of high energy trapped electrons are presented on the basis of measurements made by the satellite Intercosmos-17 at altitude approx. 500 km in the region L + 1.45-5. In the outer radiation belt the flux of trapped electrons is approximately equal to that of the albedo electrons. A trapped electron flux clearly larger than that of the albedo flux is observed only in regions of the magnetosphere where trapped protons are observed. This fact implies the intrinsic interconnection of the two particle populations. An explanation of the existence of trapped electrons (Esub(e) = 20-100 MeV) in the inner radiation belt only by diffusion due to sudden impulses of the geomagnetic field is connected with difficulties assuming energetic losses of electrons. (author)