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  • 1995-1999  (2)
  • 1980-1984  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Investigation of the (n, γf) process on a235U nucleus (1980)
    Springer
    Czechoslovak journal of physics 30 (1980), S. 1101-1114 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The fluctuations of uranium X-rays yield in coincidence with fission of the235U nucleus were observed at several neutron resonances. The results show the dependence ofK α1 yield on fission widthΓ f. This dependence is explained by the (n, γf) process which is the result of competition between fission and γ-decay during the deexcitation of the236U compound nucleus. The mean width 〈Γ f〉 was determined to be equal to (2·1 −1·7 +1·5 ) meV. The mean energy of prefissionγ-rays was found to be (750 −130 +400 ) keV. It seems that the γ-transitions taking place before fission of the236U compound nucleus are mostly of the magnetic dipole.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01604471
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    On the relationship between o-Ps lifetime in liquids and their surface tension (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 211 (1996), S. 11-14 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract It is shown that the Nakanishi-Jean formulae for o-Ps lifetime vs. radius of spherical cavity gives the empirical relationship of Tao which links the o-Ps annihilation rate with macroscopic surface tension.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036249
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the expansion of hole in main chain polymers determined by positron annihilation (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 210 (1996), S. 563-570 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The temperature dependence of positron annihilation characteristics,τ 3 andI 3, has been studied on sample of poly(butadiene), poly(isobutylene) and poly(chloroprene). The temperature range was between 15 and 470 K. The rate of expansion of holes or free-volume in all samples was deduced belowT g as well aboveT g as appr. 3·10−3 K−1 and 2·10−2 K−1, respectively. These values are very close to the rate of the mean squared displacement of scatterer〈r 2〉observed in neutron scattering experiments. A possibility to use an inverse value of free-volume,V f −1 for study of viscoelastic state of polymers is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02056396
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    Paper (German National Licenses)
    Fulltext
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