[en] In this talk results will be presented on the study of hadrons produced in the charged current interaction of high energy neutrinos and antineutrinos on an isoscalar target (Ne) and compared to preliminary results of a neutrino proton experiment. The data are analyzed in the framework of the quark parton model. General predictio of scaling and universality in the quark fragmentation region are tested in the data for values of Q² up to 150 GeV²/c². The data are compared with the predictions of the parameterisation of quark fragmentation of Field and Feynman and with those that follow from the assumption of longitudinal phase space. Results on a preliminary search for high transverse momentum phenomena at high Q² are also presented. (orig./WL)

[en] The performance of the External Muon Identifier (ENI) being under construction for the Big European Bubble Chamber (BEBC) is studied by means of explicit analytical calculations of muon detection probabilities. The BEBC is assumed to be filled with H₂ or a Ne-H₂ mixture. It is shown that the efficiency of the EMI depends critically on the precision of the extrapolation of particle tracks from the bubble chamber to the EMI detector plane as well as on the desity of background particles. The performance of the EMI will be excellent for low intensity Narrow Band Beam (NBB) neutrino experiments. In high intensity Wide Band Beam (WBB) experiments the probability to identify muons correctly in charged current events will be still adequate. The efficiency to separate neutral current events from charged current events will be less satisfactory. (orig.)

[en] Results are presented on the study of hadrons produced in the charged current interaction of high energy neutrinos and antineutrinos on an isoscalar target (Ne) and compared to preliminary results of a neutrino proton experiment. The data are analyzed in the framework of the quark parton model (QPM). General predictions of scaling and universality in the quark fragmentation region are tested in the data for values of Q² up to 150 GeV²/c². The data are compared with the predictions of the parameterisation of the quark fragmentation of Field and Feynman (Phys. Rev.; D15:2590 (1977) and Nucl. Phys.; B136:1 (1978)) and with those that follow from the assumption of longitudinal phase space. Results on a preliminary search for high transverse momentum phenomena at high Q² are also presented. (U.K.)

No abstract available

No abstract available

[en] For implementing its responsabilities in international safeguards, the IAEA is operating, since 1976, at Seibersdorf, an analytical laboratory, made available by the Austrian Government and doted with a very comprehensive health physics system. Results of six-year operation, presented here, show that this system is well adapted and that the exposure of radiation workers is being kept at a very low level. (Author)

No abstract available

No abstract available

[en] A laboratory rainfall and evaporation experiment was conducted to study the effectiveness of the soil surface structure on infiltration and subsequent evaporation. The stability of the surface layer was improved through the application of synthetic additives such as bituminous emulsion and a prepolymer of polyurea (Uresol). The soil column where the soil surface was treated with a bituminous emulsion shows a decrease in depth of wetting owing to the water repellency of that additive, and consequently an increased runoff. However, the application of Uresol to the surface layer improved the infiltration. The main reason for these differences is that in the untreated soils there is a greater clogging of macropores originating from aggregate breakdown under raindrop impact in the top layer. The evaporation experiment started after all columns were wetted to a similar soil-water content and was carried out in a controlled environmental tunnel. Soil-water content profiles were established during evaporation by means of a fully automatic γ-ray scanner. It appears that in both treatments the cumulative evaporation was less than in the untreated soil. This was due to the effect of an aggregated and stabilized surface layer. Under a treated soil surface the evaporation remains constant during the whole experiment. However, under an untreated soil surface different evaporation stages were recorded. From these experiments the impression is gained that the effect of aggregating the soil surface is an increase of the saturated hydraulic conductivity under conditions near saturation. On the other hand, a finely structured layer exhibits a greater hydraulic conductivity during evaporation in the lower soil-water potential range than a coarsely aggregated layer. So it may be concluded that, to obtain the maximum benefit from the available water - optimal water conservation - much attention must be given to the aggregation of the top soil and its stability. (author)

[en] The quantum efficiency of back-illuminated silicon pn-junction detectors is evaluated in the spectral range from 1.2 to 1400 eV, comprising the near infrared, visible, ultraviolet and soft X-ray regions. The calibrations are performed with the same device over the entire measured range, thus eliminating technological variations of the entrance window. Recent technological developments have yielded detectors with near-theoretical quantum efficiencies