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  • Zeitschriften
  • Artikel  (2.285)
  • 1955-1959  (2.285)
  • Energietechnik  (2.285)
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  • Zeitschriften
  • Artikel  (2.285)
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  • 1
    Digitale Medien
    Digitale Medien
    Polarographic investigation of complex plutonium oxalates (1958)
    Springer
    Atomic energy 4 (1958), S. 63-70 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract The composition and stability of complex ions of tri- and tetravalent plutonium in oxalate solutions were investigated polarographically. The complexes Pu(C2O4)4 −4 (preponderant amount) and Pu (C2O4)4 −5 were formed in solutions of potassium oxalate with pH 3.5–6. Under these conditions, Pu+4 gave a well expressed reverse reaction wave, suitable for the quantitative polarographic determination of plutonium. The oxidation-reduction potential of this reaction in 1 M potassium oxalate was equal to 0.205 v (relative to a saturated calomel electrode at a temperature of 25 ° C). Two Pu+4 complexes were simultaneously present in solutions at pH 6–8. From data on the solubility of Pu(C2O4)3, we determined the instability constants of the complex oxalate ions Pu(C2O4)3 −3 and Pu(C2O4)4 −5, and from the polarographic data those forPu(C2O4)4 −4 ions: $$K_{Pu(C_2 O_4 )_4 ^{ - 3} } = 2.4 \cdot 10^{ - 12} .K_{Pu(C_2 O_4 )_3 ^{ - 3} } = 2.2 \cdot 10^{ - 11} .K_{Pu(C_2 O_4 )_4 ^{ - 4} } = 33 \cdot 10^{ - 23} $$
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514561
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  • 2
    Digitale Medien
    Digitale Medien
    Investigation of the γ-rays accompanying thermal-neutron capture by certain rare-earth nuclei (1958)
    Springer
    Atomic energy 4 (1958), S. 19-23 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract Using a scintillation spectrometer measurements have been made of the spectra of γ-rays accompanying thermal-neutron capture in a number of nuclei. A number of intense lines have been found below 300 kev in the γ-ray spectra for thermal-neutron capture in europium, gadolinium, dysprosium, holmium, erbium, thulium, hafnium and tantalum. Lines corresponding to 4+→2+ and 2+→0+ transitions between rotational levels'of Er168 and Hf178 were found in the erbium and hafnium spectra. The intensity of these transitions corresponds to 0.5–0.8 photons per capture event.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514556
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  • 3
    Digitale Medien
    Digitale Medien
    γ-ray spectra from the radiation capture of neutrons for even-even radiating nuclei with rotational levels (1958)
    Springer
    Atomic energy 4 (1958), S. 1-18 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract Using a magnetic Compton spectrometer, we measured the spectra of the γ-rays arising from the capture of thermal neutrons by nuclei of gadolinium, erbium, hafnium, dysprosium and tantalum in the energy range 0.3–9 Mev. We determined the energies and the intensities of the γ-lines. For the first three elements, the radiating nuclei are the even-even nuclei64Gd 92 156 ,64Gd 94 158 ,68Er 100 168 and72Hf 106 178 , which have rotational structural levels close to the ground state. The peculiarity of the spectra of these nuclei is the presence of a group of closely placed intense γ-lines with energies of ∼ 1 Mev. These lines are absent in the case of even-odd (for example,66Dy 99 165 ) and odd-odd radiating nuclei (for example,73Ta109 182). The peculiarities of the γ-ray spectra noted are due to the structure of the lower nuclear levels.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514555
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  • 4
    Digitale Medien
    Digitale Medien
    Nuclear information obtainable from low energy neutron spectroscopy (1958)
    Springer
    Atomic energy 4 (1958), S. 25-31 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract The results of measurements of thermal-neutron cross sections, level distributions in the resonance region, $${{\overline {\Gamma _n^0 } } \mathord{\left/ {\vphantom {{\overline {\Gamma _n^0 } } D}} \right. \kern-\nulldelimiterspace} D}$$ ratios, and determinations of the effective nuclear radius from potential:.scattering of slow neutrons are considered. A discrepancy in the results of measurements of the thermal-neutron fission cross secticn in U235 is noted. The distribution of levels exhibits a deficiency in small spacings as compared with a random distribution, i. e., there seems to be a “repulsion” of levels. The dependence of $${{\overline {\Gamma _n^0 } } \mathord{\left/ {\vphantom {{\overline {\Gamma _n^0 } } D}} \right. \kern-\nulldelimiterspace} D}$$ on atomic number A is nonmonotonic, in accordance with the complex-potential model of the nucleus; however there is a considerable discrepancy between the experimental data and theory for atomic numbers in the neighborhood of 100. The effective radius determined from potential scattering of slow neutrons indicates a nonmonotonic dependence on A, in agreement with the model of a semi-transparent nucleus with smeared-out edges.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514557
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  • 5
    Digitale Medien
    Digitale Medien
    Special fine-grained emulsion for nuclear research (1958)
    Springer
    Atomic energy 4 (1958), S. 47-54 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract A method has been found for manufacturing special high-uniformity fine-grained emulsions with a most probable size of 0.04–0.08μ for the microcrystals. A method of potentiometric control of the emulsification process is presented which provides good reproducibility of the emulsions. Depending on the purpose of the research, using this method it is possible to fabricate special fine-grained emulsions for detection of charged particles with any sensitivity — from fragments up to relativistic particles — with track densities of 60 grains/100 μ of particle range.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514559
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  • 6
    Digitale Medien
    Digitale Medien
    Radioactive dangers from continuous atomic bomb testing (1958)
    Springer
    Atomic energy 4 (1958), S. 71-81 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract The present article is a study of the hazards from the global radioactive fallout of continuous atomic bomb tests of 11 megaton TNT equivalent per year. The Sr90 concentration in the bones is calculated, as well as the number of incidences of leukemia (blood cancer) and the number of cases of genetic damage. Calculations show that at the end of the century the Sr90 concentration in vertebrae may be greater than the offician maximum allowable concentration for a large segment of the population, and that each year of continued testing increases by 44,000 the number of people in the world burdened with hereditary disease and increases the incidence of leukemia by 29,000 cases.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514562
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  • 7
    Digitale Medien
    Digitale Medien
    Investigation of the structural changes taking place in a uranium-molybdenum alloy under the action of neutron irradiation (1958)
    Springer
    Atomic energy 4 (1958), S. 33-45 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract An alloy of uranium with 9 wt.%molybdenum was subjected to neutron irratiation, after which the electrical resistivity was measured and the structure studied by x-ray and microposcopic analysis. Preliminary heat treatment allowed specimens to be obtained with an α +γ′ eutectoid structure having various grain sizes. It was established that the rate of diffusion leading to homogenization under the action of irradiation in annealed specimens is inversely proportional to the square of the grain size (the period of the lamellar eutectoid). In a homogeneous specimen (γ-phase) irradiation causes a change in properties and structure which rapidly (in 2–4 hours) attains a limiting value, which is explained as being due to radiation annealing. Disordering was found in the γ′-phase, with a transition to the cubic lattice which took place under the influence of irradiation during the first hours of exposure. All these phenomena are satisfactorily accounted for on the basis of the theory previously developed [2], although the magnitudes of the thermal-spike region and of the energy liberated in it, equal respectively to 2.5 · 10−17 cc and approximately 2 Mev, are less than were determined in [2].
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514558
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  • 8
    Digitale Medien
    Digitale Medien
    Determination of the compositions and instability constants of some oxalate complexes of Pu+3 by an ion exchange method (1958)
    Springer
    Atomic energy 4 (1958), S. 55-61 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Notizen: Abstract The complex formation of Pu+3 ions in oxalate solutions over the pH range 1.4–3.0 was studied by an ion exchange method. It was established that in this pH range the complex ions [Pu (C2O4)2]− and [Pu(HC2O4)4]− are formed and that their instability constants are KH=7.1·10−10 and KH″=1.1·10−11, respectively. The value of the instability constant of the complex ion [Pu(C2O4)2]} agrees satisfactorily with the instability constant of the corresponding complex ion, obtained by a solution method.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514560
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  • 9
    Digitale Medien
    Digitale Medien
    Similitude relations for critical heat loading in forced liquid flow (1958)
    Springer
    Atomic energy 4 (1958), S. 89-94 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514564
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  • 10
    Digitale Medien
    Digitale Medien
    Axial stability and localization of bunches in a quasineutral plasma, accelerated by electromagnetic fields (1958)
    Springer
    Atomic energy 4 (1958), S. 83-88 
    Details
    ISSN: 1573-8205
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01514563
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