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  • 1995-1999  (3)
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  • 1995-1999  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Anomalous enhancement of DD reaction in Pd and Au/Pd/PdO heterostructure targets under low-energy deuteron bombardment (1998)
    Springer
    JETP letters 68 (1998), S. 823-829 
    Details
    ISSN: 1090-6487
    Keywords: 25.45.−z ; 27.60.+j ; 27.80.+w
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Yields of protons emitted in the D+D reaction in Pd, Au/Pd/PdO, Ti, and Au foils are measured by a d E-E counter telescope for bombarding energies between 2.5 and 10 keV. The experimental yields are compared with those predicted from a parametrization of the cross section and stopping power at higher energies. It is found that for Ti and Au target the enhancement of the D(d,p)T reaction is similar to that observed with a deuterium gas target (several tens of eV). The dependence of the yields on the bombarding energy corresponds well to the screening potential parameters U s=250±15 eV for Pd and 601 ±23 eV for Au/Pd/PdO. Possible models of the enhancement obtained are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.567800
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Reinvestigation of low-lying levels of231Th (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 239 (1999), S. 151-153 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Low-lying excited levels of231Th fed through α-decay of235U were investigated by using α-γ and γ-γ coincidence technique. From the analyses for co-relating energy levels and transition intensities, we found that the most favorable transition from 205.3 keV ([631]7/2) level that is fed by the most dominant α transition from235U is 19.6 keV transition (205.3 keV [631]7/2−→185.7 keV [631]5/2−). We also found that the transition probability of 109.2 keV, 205.3 keV [631]7/2−→96.1 keV [633]9/2+, was corrected to be weak. These findings can explain why the 185.7 keV γ-ray is so strongly observed, 0.57 photons/ga, in the γ-spectrum associated with the α-decay of235U. The decay scheme of231Th levels previously reported has been modified according to the present analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349547
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Bremsstrahlung emission in α-decay of210Po (1999)
    Springer
    Journal of radioanalytical and nuclear chemistry 239 (1999), S. 123-126 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Bremsstrahlung photons associated with the α-decay of210Po were measured in α-γ coincidence measurements with Si and Ge detectors. Emission probabilities of the bremsstrahlung deduced for210Po were 10−11∼10−12/keV/sr/decay for 100≤E γ≤600 keV. It was found that the bremsstrahlung yields are much smaller than those predicted by a Coulomb acceleration model. This suggests that α-particles also emit photons inside the barrier. The bremsstrahlung spectrum was compared with a quasi-classical calculation in which the bremsstrahlung emission in tunneling motion of α-particles is taken into account. It is shown that the data can be interpreted as a consequence of destructive interference of radiative amplitudes outside the Coulomb barrier with those in tunneling.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02349542
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    Paper (German National Licenses)
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