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[en] Reconstruction problem of a pulsed NMR spectrometer is discussed. The development work extends on the architecture of applied computer system, programmable pulse and gradient generator, flux stabilizer, magnetic field stabilizer and its modulator. (author)
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Conference of the Spectroscopy Committees of socialist countries; Balatonszeplak (Hungary); 31 Aug - 5 Sep 1986
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[en] The multiphoton stripping of atoms and the related ionization processes form an intensively investigated field of the atomic physics. The results of two recently published papers by Reiss discussing the spectrum of the emitted electrons originated from multiphoton ionization of xenon atoms, based on his earlier works contradict to the results of the commonly used Keldish theory. It is shown that the difference between the two theories is based on the application of different gauge conventions which led to different approximation schemes of the S matrix. The formulas of Reiss' papers are not correct. (D.G.) 23 refs
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[en] There are a few Xα studies on the hyperfine interactions, however, systematic investigation is still lacking. The total electronic density at the nucleus for atoms has been calculated by the Xα method with ab initio exchange parameter αSCF. Calculations have been done for a few atoms with the exchange parameter 2/3, 1 and αHF, too. It has been found that the values obtained with αHF and αSCF show the best agreement with the Hartree-Fock data. (author) 6 refs.; 4 tabs
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[en] The process of conversion of gravitational waves into electromagnetic waves is studied in an axisymmetric Bianchi type I universe with a uniform magnetic field. A case is found in which the process is sufficiently effective to maintain a continuous interchange between photons and gravitons. This causes photons and gravitons to have the same frequency. (author) 7 refs
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[en] The first stage of the charge sensitive preamplifier of the high energy resolution Si(Li) X-ray spectrometers is a cooled junction field-effect transistor (FET) exhibiting low level of noise. The spectrometer manufacturers use selected FET chips mounted into low dielectric loss material. Noise measurements have been performed for selection of low cost commercial FETs of type 2N4416 from different series of Texas Instruments factories. The FETs were encapsulated and mounted into a teflon block. The measurements have been carried out in a high impedance gate mode in time domain. The noise measurement arrangement, the results of selection of FETs and some observations on generation-recombination (GR) noise of FETs are described. (author) 9 refs.; 8 figs
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[en] Measurements of aerosol activity from the Chernobyl reactor accident are reported. The concentrations of 14 radionuclides were obtained by gamma spectrometry for the period 30 April - 9 May, 1986. Gross beta measurements were also done through 11 August 1986 of which 137Cs activity concentrations were derived. 90Sr activity concentrations were also determined for selected aerosol samples using nondestructive procedure. The time course of contamination observed in Debrecen (Hungary) is discussed in terms of trajectory analysis. Isotopic ratios are also used to trace down routes of contamined air. In addition, such ratios are also used to characterize the status of the damaged reactor at different times. (author) 15 refs.; 2 figs
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Numerical Data
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ACCIDENTS, AEROSOLS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CESIUM ISOTOPES, COLLOIDS, DATA, DEVELOPING COUNTRIES, DISPERSIONS, ENRICHED URANIUM REACTORS, EUROPE, EVEN-EVEN NUCLEI, GRAPHITE MODERATED REACTORS, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOTOPES, LWGR TYPE REACTORS, MONITORING, NUCLEI, NUMERICAL DATA, ODD-EVEN NUCLEI, POWER REACTORS, RADIOISOTOPES, REACTORS, SOLS, SPECTROSCOPY, STRONTIUM ISOTOPES, THERMAL REACTORS, WATER COOLED REACTORS, YEARS LIVING RADIOISOTOPES
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[en] The kinetics of the colour recovery processes in irradiated 'Red Acrylic' dosimeters was studied. It was found that the decay is due to diffusion of oxygen into the matrix and a thermal decay takes place, too. The diffusion processes result in the appearance of a clear surface layer which becomes thicker and thicker. This layer is separated by a sharp boundary surface from the dark region. The activation energy of the oxygen diffusion was determined from the kinetics. In samples irradiated and heat-treated in noble gas this process does not take place but it was observed that in pure oxygen, chlorine and in air the colour recovery was similar. (author) 8 refs.; 3 figs
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[en] Data sources are listed and an evaluation procedure is described that have been used recently to derive the best values of nuclear root-mean-square (RMS) charge radii measured by fast electron scattering and muonic atom X-rays. The evaluation procedure consists of two algorithms. The first one performs a search for discrepant data 'outliers' together with an eventual reassignment of their errors; this algorithm is active only for groups containing at least n=5 data. The second algorithm forms a weighted mean and its error for each data group; it takes into account both external and internal consistencies. An illustrative Table of input data as well as a Table of '1990 best values' of nuclear RMS charge radii are also included. (author) 50 refs.; 1 fig.; 3 tabs
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[en] The purpose of this note is to extend the calculation of the infrared behaviour of the quark propagator S'F(p) for the gauge group SU(2) to the case of SU(3). Assuming a k-4 singularity for the gluon propagator at k→0, it is shown that in quantum chromodynamics the quark propagator is finite on the mass shell in axial and covariant gauges, and in axial gauges it has an essential singularity in g2 at g2 = 0 around the mass shell. (author) 2 refs
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[en] A study is presented of the deep inelastic neutrino-nucleon scattering programme for an UNK neutrino experiment. The possibility to measure the ν-N-structure functions W2, xW3 and R=σL/σT and individual quark distributions using p and d targets was investigated. The statistical precision to measure ΛQCD, αS(Q2) and the gluon distribution from xW3, W2 and Σxqi is evaluated. (author) 28 refs.; 17 figs.; 4 tabs
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BARYONS, CATIONS, CHARGED PARTICLES, ELEMENTARY PARTICLES, FERMIONS, FIELD THEORIES, FUNCTIONS, HADRONS, HYDROGEN IONS, HYDROGEN IONS 1 PLUS, INELASTIC SCATTERING, INTERACTIONS, IONS, LEPTON-BARYON INTERACTIONS, LEPTON-HADRON INTERACTIONS, LEPTON-NUCLEON INTERACTIONS, NUCLEONS, PARTICLE INTERACTIONS, POSTULATED PARTICLES, QUANTUM FIELD THEORY, SCATTERING
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