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  • 1
    Digitale Medien
    Digitale Medien
    An intelligent modeling environment for a large engineering analysis code: Design issues and development experience (1988)
    Springer
    Engineering with computers 3 (1988), S. 167-179 
    Details
    ISSN: 1435-5663
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Informatik , Maschinenbau , Technik allgemein
    Notizen: Abstract This paper describes basic research issues and our experience in the development of an intelligent modeling environment for use with a large engineering analysis code. The intelligent environment, the Athena Aide, is a working prototype system that assists analysts in the preparation of models for the ATHENA thermal-hydraulics code. The paper includes the background and basis for our research and descriptions of the analysis code and the intelligent environment, and discusses research topics addressed during the development including design goals, general and specific design issues, information management and representation issues, and user acceptance issues related to the model construction task. Our research has shown that data management is a fundamental consideration during the model construction task and an intelligent environment is a valuable assistant to the analyst in that regard. Providing modeling advice commensurate with the general nature of the analysis code was found to be extremely difficult. For modeling tasks where specific heuristic knowledge has accumulated, useful modeling advice can be provided.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01349628
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  • 2
    Digitale Medien
    Digitale Medien
    The reactions N14(n, α)B11 and N14(n, t)C12 observed with a gridded ionization chamber (1966)
    Springer
    The European physical journal 197 (1966), S. 124-135 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The cross sections for the reactions N14(n, α)B11 and N14(n, t)C12 have been measured in the neutron energy range 4.0 to 6.4 MeV and at 2.5 MeV. Mono-energetic neutrons were produced in the D(d, n) He3 reaction using a gas target. The (n, α) and (n, t) disintegrations were detected in a gridded ionization chamber filled with an argonnitrogen mixture. The response of the chamber under different operation conditions is described. The excitation functions, measured with a neutron energy resolution of 40 to 50 keV, are given for theα 0 group from the N14(n,α)B11 reaction over the entire neutron energy range and for theα 1 group and the t0 group from N14(n, t) C12 for neutron energies above 4.3 and 5.6 MeV, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01326742
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  • 3
    Digitale Medien
    Digitale Medien
    L-subshell fluorescence and coster-kronig yields atZ=92 and the decay of235Np (1972)
    Springer
    The European physical journal 255 (1972), S. 335-347 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract TheK andL x-rays emitted in the decay of235Np have been studied with high resolution Ge(HP) and Si(Li) detectors in coincidence, in order to obtain theL 2 andL 3 subshell fluorescence and Coster-Kronig yields atZ=92. The results are:v 2=0.630±0.036, ω2=0.560±0.033,f 23=0.147±0.010, and ω3=0.481±0.029. Results for theL 1 subshell were derived from singles spectra, by assuming a value off 13 of 0.67, and are:v 1=0.54±0.04, ω1=0.21±0.04, andf 12〈0.07. With the same assumption, theL 1/K electron capture ratio and decay energyQ ec for235Np were found to be 29.0±3.6 and 123.6±0.7 keV, respectively. RelativeL x-ray intensities forZ=92 also were measured and are compared with the theory of Scofield and with recent diffraction experiments. Electron ejection from theL shell during235Np decay has been studied byL x-ray-L x-ray coincidences and found to occur with a probability of (1.3±1.0) × 10−4 per disintegration.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01392538
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  • 4
    Digitale Medien
    Digitale Medien
    A γγ coincidence study of transitions in239Np and239Pu from decay of243Am (1975)
    Springer
    The European physical journal 272 (1975), S. 169-174 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Gamma-gamma coincidences and singles measurements with Ge detectors have been made on transitions in239Np and239Pu. Eighteen transitions in239Pu and three in239Np have been verified by coincidence data. High resolution singles measurements were made and new values for the energy and intensities ofγ-rays below 350 keV were obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01408144
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  • 5
    Digitale Medien
    Digitale Medien
    TheK-shell conversion coefficient of the 135.5 keVM4 transition in193m Pt decay (1976)
    Springer
    The European physical journal 279 (1976), S. 27-29 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract TheK conversion coefficient of the 135.5 keVM4 transition in193m pt has been determined by the XPG method. The result isα K =135.2±10.5 and the value exhibits a deviation 3.4% below the theoretical prediction of Hager and Seltzer. Similar deviations have been systematically observed in precision values ofE3 andM4 conversion coefficients reported in the literature.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01409088
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  • 6
    Digitale Medien
    Digitale Medien
    TheL 2-L 3 Coster-Kronig transition probability at Z=96 (1976)
    Springer
    The European physical journal 278 (1976), S. 239-240 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The total probabilityf 23 for theL 2–L 2 Coster-Kronig transition atZ=96 was measured by theL α−K α1,2 x-ray coincidence technique with a249Cf radioactive source. The value at Z=96 was found to bef 23=0.209±0.022 (2σ, 95% confidence). This result is in agreement within the 2σ error limits with previous measurements which range from 0.188 to 0.226, and this spread cannot be reduced by improvements in the experimental technique primarily because of the large correction required for the effect of nuclear cascading in249Cf decay.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01409173
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  • 7
    Digitale Medien
    Digitale Medien
    Electron capture decay of181W: L subshell fluorescence and Coster-Kronig yields in Ta (1970)
    Springer
    The European physical journal 239 (1970), S. 423-428 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The TaL x-ray spectrum from the 140 d electron capture decay of181W was studied with high resolution semiconductor detectors and fast coincidence techniques. Measurement ofL x-ray-K x-ray andL x-ray—γ-ray coincidence rates yielded the followingL shell fluorescence and Coster-Kronig yields and radiative decay branching ratios: ω2=0.250±0.013, ω3=0.228±0.013 (corrected for angular correlation effects),f 23=0.180±0.007,v 1=O.218±0.016,s 3=0.205+-0.010,s 2=0.215+-0.010,f 13+f 12 f 23=0.36+-0.02, and ω1+f 12ω2=0.14±0.02, from which upper limits were obtained off 13〈0.36 and ω1〈0.14.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01401197
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  • 8
    Digitale Medien
    Digitale Medien
    Gamma radiation in the decay of249Cf (1971)
    Springer
    The European physical journal 245 (1971), S. 191-197 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Gamma radiation following alpha decay of249Cf was investigated with high resolution Ge(Li) detectors in singles and coincidence arrangements. Nine new γ-rays were identified and placed in the previously-known decay scheme. Their energies in keV and intensities relative to the 388 keV (100) γ-ray are: 37.5±0.1 (0.026), 65.87±0.1 (0.017), 121.5±0.4 (0.070), 229.2±0.2 (0.072), 255.7±0.2 (0.065), 390.5±0.2 (0.025), 405.9±0.1 (0.014), 588.8±0.1 (0.003), and 643.5±0.1 (0.007). Coincidence measurements revealed that the intensity of the 54.7 keV γ-ray is shared by three intraband transitions and that the 121.5 keV crossover transition is present in the ground-state band.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01395230
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  • 9
    Digitale Medien
    Digitale Medien
    Gamma branching and total conversion coefficients of intraband transitions in the groundstate rotational band of245Cm (1972)
    Springer
    The European physical journal 253 (1972), S. 13-16 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract With calibrated Ge(Li) detectors, γ-γ coincidences have been observed in the decay of249Cf. The total conversion coefficient of the 54.7 and 66.7 keV transitions in the first rotational band have been determined to be 237±30 and 69±15, respectively. The branching ratio of the 121.5keV crossover transition is (22±7)%. The errors are the 2σ statistical uncertainties, linearily added to the errors in the detector efficiencies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01387165
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  • 10
    Digitale Medien
    Digitale Medien
    TheK-conversion coefficient near threshold of the 30 keV isomeric transition in108mAg decay (1972)
    Springer
    The European physical journal 254 (1972), S. 281-285 
    Details
    ISSN: 1434-601X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract With calibrated Ge(Li) x-ray detectorsK x rays in the conversion of the 30 keV isomeric transition in the decay of108mAg were observed in coincidence with 79 keV γ-rays. Thus, the fraction of 30 keV transitions which take place byK conversion was measured to be (2.44±0.23) × 10−2. Making use of a theoretical total conversion coefficient (K conversion contributes only a minor part of the total conversion coefficient), an experimental value of theK-conversion coefficient was obtained, αK=(1.07 ± 0.10) × 104 (where the error represents twice the standard deviation to which the error in the detector efficiency has been added linearly). This value agrees with the theory of Hager and Seltzer forM4 conversion. The energy of the cascading γ-ray was remeasured to be 79.20 ± 0.05 keV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01390257
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